Using the command line switches -pedantic -ffast-math triggers an error and aborts compilation of code using HUGE_VAL. To reproduce, save the following code as huge.cpp: #include <math.h> #include <stdio.h> int main(int argc,char **argv) { double v = HUGE_VAL; printf("%f\n",v); return 0; } Compile with: g++-4.0 -ffast-math -pedantic huge.cpp Result is: huge.cpp:6:14: warning: use of C99 hexadecimal floating constant huge.cpp:6: error: floating constant exceeds range of 'double' Compilation aborts here. Note that there is a similar bug in the database, namely #11931 that exists at least since g++-3.3.2 and has not been touched yet. Unfortunately, starting with g++-4.0.1, this bug causes an unjustified error (not just a warning) and thus avoids compilation of existing production code. Bug #11931 has been marked as priority "low"; however, since this bug remained in the bug data base for so long now, and since it is now even raised to an error instead of just a warning, I would like to suggest to raise the priority to "normal". And please, please: Could please someone care about this one? So long, and thanks a lot, Thomas
Can you attach the preprocessing source as the glibc I have installed defineds HUGE_VAL as __builtin_huge_val().
As per request, here is the preprocessed source code: int main(int argc,char **argv) { double v = (__extension__ 0x1.0p2047); printf("%f\n",v); return 0; }
Hmm, if passed in 4.0.0 20050225 but fails on the mainline. It also works with the C front-end.
Subject: Re: -pedantic -ffast-math breaks working code pinskia at gcc dot gnu dot org wrote: > ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-07-29 21:06 ------- > Can you attach the preprocessing source as the glibc I have installed defineds HUGE_VAL as > __builtin_huge_val(). > Sorry to respond by mail, but the output is a bit too long to fit comfortably into the bug database; I submitted a shortened version there with only the preprocessed main program there. Please find the full program attached. LibC-dev is "libc6-dev 2.3.2.ds1-22". Thanks, Thomas # 1 "huge.cpp" # 1 "<built-in>" # 1 "<command line>" # 1 "huge.cpp" # 1 "/usr/include/math.h" 1 3 4 # 27 "/usr/include/math.h" 3 4 # 1 "/usr/include/features.h" 1 3 4 # 295 "/usr/include/features.h" 3 4 # 1 "/usr/include/sys/cdefs.h" 1 3 4 # 296 "/usr/include/features.h" 2 3 4 # 318 "/usr/include/features.h" 3 4 # 1 "/usr/include/gnu/stubs.h" 1 3 4 # 319 "/usr/include/features.h" 2 3 4 # 28 "/usr/include/math.h" 2 3 4 extern "C" { # 1 "/usr/include/bits/huge_val.h" 1 3 4 # 34 "/usr/include/math.h" 2 3 4 # 1 "/usr/include/bits/nan.h" 1 3 4 # 38 "/usr/include/math.h" 2 3 4 # 1 "/usr/include/bits/mathdef.h" 1 3 4 # 29 "/usr/include/bits/mathdef.h" 3 4 typedef long double float_t; typedef long double double_t; # 41 "/usr/include/math.h" 2 3 4 # 65 "/usr/include/math.h" 3 4 # 1 "/usr/include/bits/mathcalls.h" 1 3 4 # 53 "/usr/include/bits/mathcalls.h" 3 4 extern double acos (double __x) throw (); extern double __acos (double __x) throw (); extern double asin (double __x) throw (); extern double __asin (double __x) throw (); extern double atan (double __x) throw (); extern double __atan (double __x) throw (); extern double atan2 (double __y, double __x) throw (); extern double __atan2 (double __y, double __x) throw (); extern double cos (double __x) throw (); extern double __cos (double __x) throw (); extern double sin (double __x) throw (); extern double __sin (double __x) throw (); extern double tan (double __x) throw (); extern double __tan (double __x) throw (); extern double cosh (double __x) throw (); extern double __cosh (double __x) throw (); extern double sinh (double __x) throw (); extern double __sinh (double __x) throw (); extern double tanh (double __x) throw (); extern double __tanh (double __x) throw (); extern void sincos (double __x, double *__sinx, double *__cosx) throw (); extern void __sincos (double __x, double *__sinx, double *__cosx) throw (); extern double acosh (double __x) throw (); extern double __acosh (double __x) throw (); extern double asinh (double __x) throw (); extern double __asinh (double __x) throw (); extern double atanh (double __x) throw (); extern double __atanh (double __x) throw (); extern double exp (double __x) throw (); extern double __exp (double __x) throw (); extern double frexp (double __x, int *__exponent) throw (); extern double __frexp (double __x, int *__exponent) throw (); extern double ldexp (double __x, int __exponent) throw (); extern double __ldexp (double __x, int __exponent) throw (); extern double log (double __x) throw (); extern double __log (double __x) throw (); extern double log10 (double __x) throw (); extern double __log10 (double __x) throw (); extern double modf (double __x, double *__iptr) throw (); extern double __modf (double __x, double *__iptr) throw (); extern double exp10 (double __x) throw (); extern double __exp10 (double __x) throw (); extern double pow10 (double __x) throw (); extern double __pow10 (double __x) throw (); extern double expm1 (double __x) throw (); extern double __expm1 (double __x) throw (); extern double log1p (double __x) throw (); extern double __log1p (double __x) throw (); extern double logb (double __x) throw (); extern double __logb (double __x) throw (); extern double exp2 (double __x) throw (); extern double __exp2 (double __x) throw (); extern double log2 (double __x) throw (); extern double __log2 (double __x) throw (); extern double pow (double __x, double __y) throw (); extern double __pow (double __x, double __y) throw (); extern double sqrt (double __x) throw (); extern double __sqrt (double __x) throw (); extern double hypot (double __x, double __y) throw (); extern double __hypot (double __x, double __y) throw (); extern double cbrt (double __x) throw (); extern double __cbrt (double __x) throw (); extern double ceil (double __x) throw () __attribute__ ((__const__)); extern double __ceil (double __x) throw () __attribute__ ((__const__)); extern double fabs (double __x) throw () __attribute__ ((__const__)); extern double __fabs (double __x) throw () __attribute__ ((__const__)); extern double floor (double __x) throw () __attribute__ ((__const__)); extern double __floor (double __x) throw () __attribute__ ((__const__)); extern double fmod (double __x, double __y) throw (); extern double __fmod (double __x, double __y) throw (); extern int __isinf (double __value) throw () __attribute__ ((__const__)); extern int __finite (double __value) throw () __attribute__ ((__const__)); extern int isinf (double __value) throw () __attribute__ ((__const__)); extern int finite (double __value) throw () __attribute__ ((__const__)); extern double drem (double __x, double __y) throw (); extern double __drem (double __x, double __y) throw (); extern double significand (double __x) throw (); extern double __significand (double __x) throw (); extern double copysign (double __x, double __y) throw () __attribute__ ((__const__)); extern double __copysign (double __x, double __y) throw () __attribute__ ((__const__)); extern double nan (__const char *__tagb) throw () __attribute__ ((__const__)); extern double __nan (__const char *__tagb) throw () __attribute__ ((__const__)); extern int __isnan (double __value) throw () __attribute__ ((__const__)); extern int isnan (double __value) throw () __attribute__ ((__const__)); extern double j0 (double) throw (); extern double __j0 (double) throw (); extern double j1 (double) throw (); extern double __j1 (double) throw (); extern double jn (int, double) throw (); extern double __jn (int, double) throw (); extern double y0 (double) throw (); extern double __y0 (double) throw (); extern double y1 (double) throw (); extern double __y1 (double) throw (); extern double yn (int, double) throw (); extern double __yn (int, double) throw (); extern double erf (double) throw (); extern double __erf (double) throw (); extern double erfc (double) throw (); extern double __erfc (double) throw (); extern double lgamma (double) throw (); extern double __lgamma (double) throw (); extern double tgamma (double) throw (); extern double __tgamma (double) throw (); extern double gamma (double) throw (); extern double __gamma (double) throw (); extern double lgamma_r (double, int *__signgamp) throw (); extern double __lgamma_r (double, int *__signgamp) throw (); extern double rint (double __x) throw (); extern double __rint (double __x) throw (); extern double nextafter (double __x, double __y) throw () __attribute__ ((__const__)); extern double __nextafter (double __x, double __y) throw () __attribute__ ((__const__)); extern double nexttoward (double __x, long double __y) throw () __attribute__ ((__const__)); extern double __nexttoward (double __x, long double __y) throw () __attribute__ ((__const__)); extern double remainder (double __x, double __y) throw (); extern double __remainder (double __x, double __y) throw (); extern double scalbn (double __x, int __n) throw (); extern double __scalbn (double __x, int __n) throw (); extern int ilogb (double __x) throw (); extern int __ilogb (double __x) throw (); extern double scalbln (double __x, long int __n) throw (); extern double __scalbln (double __x, long int __n) throw (); extern double nearbyint (double __x) throw (); extern double __nearbyint (double __x) throw (); extern double round (double __x) throw () __attribute__ ((__const__)); extern double __round (double __x) throw () __attribute__ ((__const__)); extern double trunc (double __x) throw () __attribute__ ((__const__)); extern double __trunc (double __x) throw () __attribute__ ((__const__)); extern double remquo (double __x, double __y, int *__quo) throw (); extern double __remquo (double __x, double __y, int *__quo) throw (); extern long int lrint (double __x) throw (); extern long int __lrint (double __x) throw (); extern long long int llrint (double __x) throw (); extern long long int __llrint (double __x) throw (); extern long int lround (double __x) throw (); extern long int __lround (double __x) throw (); extern long long int llround (double __x) throw (); extern long long int __llround (double __x) throw (); extern double fdim (double __x, double __y) throw (); extern double __fdim (double __x, double __y) throw (); extern double fmax (double __x, double __y) throw (); extern double __fmax (double __x, double __y) throw (); extern double fmin (double __x, double __y) throw (); extern double __fmin (double __x, double __y) throw (); extern int __fpclassify (double __value) throw () __attribute__ ((__const__)); extern int __signbit (double __value) throw () __attribute__ ((__const__)); extern double fma (double __x, double __y, double __z) throw (); extern double __fma (double __x, double __y, double __z) throw (); extern double scalb (double __x, double __n) throw (); extern double __scalb (double __x, double __n) throw (); # 66 "/usr/include/math.h" 2 3 4 # 88 "/usr/include/math.h" 3 4 # 1 "/usr/include/bits/mathcalls.h" 1 3 4 # 53 "/usr/include/bits/mathcalls.h" 3 4 extern float acosf (float __x) throw (); extern float __acosf (float __x) throw (); extern float asinf (float __x) throw (); extern float __asinf (float __x) throw (); extern float atanf (float __x) throw (); extern float __atanf (float __x) throw (); extern float atan2f (float __y, float __x) throw (); extern float __atan2f (float __y, float __x) throw (); extern float cosf (float __x) throw (); extern float __cosf (float __x) throw (); extern float sinf (float __x) throw (); extern float __sinf (float __x) throw (); extern float tanf (float __x) throw (); extern float __tanf (float __x) throw (); extern float coshf (float __x) throw (); extern float __coshf (float __x) throw (); extern float sinhf (float __x) throw (); extern float __sinhf (float __x) throw (); extern float tanhf (float __x) throw (); extern float __tanhf (float __x) throw (); extern void sincosf (float __x, float *__sinx, float *__cosx) throw (); extern void __sincosf (float __x, float *__sinx, float *__cosx) throw (); extern float acoshf (float __x) throw (); extern float __acoshf (float __x) throw (); extern float asinhf (float __x) throw (); extern float __asinhf (float __x) throw (); extern float atanhf (float __x) throw (); extern float __atanhf (float __x) throw (); extern float expf (float __x) throw (); extern float __expf (float __x) throw (); extern float frexpf (float __x, int *__exponent) throw (); extern float __frexpf (float __x, int *__exponent) throw (); extern float ldexpf (float __x, int __exponent) throw (); extern float __ldexpf (float __x, int __exponent) throw (); extern float logf (float __x) throw (); extern float __logf (float __x) throw (); extern float log10f (float __x) throw (); extern float __log10f (float __x) throw (); extern float modff (float __x, float *__iptr) throw (); extern float __modff (float __x, float *__iptr) throw (); extern float exp10f (float __x) throw (); extern float __exp10f (float __x) throw (); extern float pow10f (float __x) throw (); extern float __pow10f (float __x) throw (); extern float expm1f (float __x) throw (); extern float __expm1f (float __x) throw (); extern float log1pf (float __x) throw (); extern float __log1pf (float __x) throw (); extern float logbf (float __x) throw (); extern float __logbf (float __x) throw (); extern float exp2f (float __x) throw (); extern float __exp2f (float __x) throw (); extern float log2f (float __x) throw (); extern float __log2f (float __x) throw (); extern float powf (float __x, float __y) throw (); extern float __powf (float __x, float __y) throw (); extern float sqrtf (float __x) throw (); extern float __sqrtf (float __x) throw (); extern float hypotf (float __x, float __y) throw (); extern float __hypotf (float __x, float __y) throw (); extern float cbrtf (float __x) throw (); extern float __cbrtf (float __x) throw (); extern float ceilf (float __x) throw () __attribute__ ((__const__)); extern float __ceilf (float __x) throw () __attribute__ ((__const__)); extern float fabsf (float __x) throw () __attribute__ ((__const__)); extern float __fabsf (float __x) throw () __attribute__ ((__const__)); extern float floorf (float __x) throw () __attribute__ ((__const__)); extern float __floorf (float __x) throw () __attribute__ ((__const__)); extern float fmodf (float __x, float __y) throw (); extern float __fmodf (float __x, float __y) throw (); extern int __isinff (float __value) throw () __attribute__ ((__const__)); extern int __finitef (float __value) throw () __attribute__ ((__const__)); extern int isinff (float __value) throw () __attribute__ ((__const__)); extern int finitef (float __value) throw () __attribute__ ((__const__)); extern float dremf (float __x, float __y) throw (); extern float __dremf (float __x, float __y) throw (); extern float significandf (float __x) throw (); extern float __significandf (float __x) throw (); extern float copysignf (float __x, float __y) throw () __attribute__ ((__const__)); extern float __copysignf (float __x, float __y) throw () __attribute__ ((__const__)); extern float nanf (__const char *__tagb) throw () __attribute__ ((__const__)); extern float __nanf (__const char *__tagb) throw () __attribute__ ((__const__)); extern int __isnanf (float __value) throw () __attribute__ ((__const__)); extern int isnanf (float __value) throw () __attribute__ ((__const__)); extern float j0f (float) throw (); extern float __j0f (float) throw (); extern float j1f (float) throw (); extern float __j1f (float) throw (); extern float jnf (int, float) throw (); extern float __jnf (int, float) throw (); extern float y0f (float) throw (); extern float __y0f (float) throw (); extern float y1f (float) throw (); extern float __y1f (float) throw (); extern float ynf (int, float) throw (); extern float __ynf (int, float) throw (); extern float erff (float) throw (); extern float __erff (float) throw (); extern float erfcf (float) throw (); extern float __erfcf (float) throw (); extern float lgammaf (float) throw (); extern float __lgammaf (float) throw (); extern float tgammaf (float) throw (); extern float __tgammaf (float) throw (); extern float gammaf (float) throw (); extern float __gammaf (float) throw (); extern float lgammaf_r (float, int *__signgamp) throw (); extern float __lgammaf_r (float, int *__signgamp) throw (); extern float rintf (float __x) throw (); extern float __rintf (float __x) throw (); extern float nextafterf (float __x, float __y) throw () __attribute__ ((__const__)); extern float __nextafterf (float __x, float __y) throw () __attribute__ ((__const__)); extern float nexttowardf (float __x, long double __y) throw () __attribute__ ((__const__)); extern float __nexttowardf (float __x, long double __y) throw () __attribute__ ((__const__)); extern float remainderf (float __x, float __y) throw (); extern float __remainderf (float __x, float __y) throw (); extern float scalbnf (float __x, int __n) throw (); extern float __scalbnf (float __x, int __n) throw (); extern int ilogbf (float __x) throw (); extern int __ilogbf (float __x) throw (); extern float scalblnf (float __x, long int __n) throw (); extern float __scalblnf (float __x, long int __n) throw (); extern float nearbyintf (float __x) throw (); extern float __nearbyintf (float __x) throw (); extern float roundf (float __x) throw () __attribute__ ((__const__)); extern float __roundf (float __x) throw () __attribute__ ((__const__)); extern float truncf (float __x) throw () __attribute__ ((__const__)); extern float __truncf (float __x) throw () __attribute__ ((__const__)); extern float remquof (float __x, float __y, int *__quo) throw (); extern float __remquof (float __x, float __y, int *__quo) throw (); extern long int lrintf (float __x) throw (); extern long int __lrintf (float __x) throw (); extern long long int llrintf (float __x) throw (); extern long long int __llrintf (float __x) throw (); extern long int lroundf (float __x) throw (); extern long int __lroundf (float __x) throw (); extern long long int llroundf (float __x) throw (); extern long long int __llroundf (float __x) throw (); extern float fdimf (float __x, float __y) throw (); extern float __fdimf (float __x, float __y) throw (); extern float fmaxf (float __x, float __y) throw (); extern float __fmaxf (float __x, float __y) throw (); extern float fminf (float __x, float __y) throw (); extern float __fminf (float __x, float __y) throw (); extern int __fpclassifyf (float __value) throw () __attribute__ ((__const__)); extern int __signbitf (float __value) throw () __attribute__ ((__const__)); extern float fmaf (float __x, float __y, float __z) throw (); extern float __fmaf (float __x, float __y, float __z) throw (); extern float scalbf (float __x, float __n) throw (); extern float __scalbf (float __x, float __n) throw (); # 89 "/usr/include/math.h" 2 3 4 # 109 "/usr/include/math.h" 3 4 # 1 "/usr/include/bits/mathcalls.h" 1 3 4 # 53 "/usr/include/bits/mathcalls.h" 3 4 extern long double acosl (long double __x) throw (); extern long double __acosl (long double __x) throw (); extern long double asinl (long double __x) throw (); extern long double __asinl (long double __x) throw (); extern long double atanl (long double __x) throw (); extern long double __atanl (long double __x) throw (); extern long double atan2l (long double __y, long double __x) throw (); extern long double __atan2l (long double __y, long double __x) throw (); extern long double cosl (long double __x) throw (); extern long double __cosl (long double __x) throw (); extern long double sinl (long double __x) throw (); extern long double __sinl (long double __x) throw (); extern long double tanl (long double __x) throw (); extern long double __tanl (long double __x) throw (); extern long double coshl (long double __x) throw (); extern long double __coshl (long double __x) throw (); extern long double sinhl (long double __x) throw (); extern long double __sinhl (long double __x) throw (); extern long double tanhl (long double __x) throw (); extern long double __tanhl (long double __x) throw (); extern void sincosl (long double __x, long double *__sinx, long double *__cosx) throw (); extern void __sincosl (long double __x, long double *__sinx, long double *__cosx) throw (); extern long double acoshl (long double __x) throw (); extern long double __acoshl (long double __x) throw (); extern long double asinhl (long double __x) throw (); extern long double __asinhl (long double __x) throw (); extern long double atanhl (long double __x) throw (); extern long double __atanhl (long double __x) throw (); extern long double expl (long double __x) throw (); extern long double __expl (long double __x) throw (); extern long double frexpl (long double __x, int *__exponent) throw (); extern long double __frexpl (long double __x, int *__exponent) throw (); extern long double ldexpl (long double __x, int __exponent) throw (); extern long double __ldexpl (long double __x, int __exponent) throw (); extern long double logl (long double __x) throw (); extern long double __logl (long double __x) throw (); extern long double log10l (long double __x) throw (); extern long double __log10l (long double __x) throw (); extern long double modfl (long double __x, long double *__iptr) throw (); extern long double __modfl (long double __x, long double *__iptr) throw (); extern long double exp10l (long double __x) throw (); extern long double __exp10l (long double __x) throw (); extern long double pow10l (long double __x) throw (); extern long double __pow10l (long double __x) throw (); extern long double expm1l (long double __x) throw (); extern long double __expm1l (long double __x) throw (); extern long double log1pl (long double __x) throw (); extern long double __log1pl (long double __x) throw (); extern long double logbl (long double __x) throw (); extern long double __logbl (long double __x) throw (); extern long double exp2l (long double __x) throw (); extern long double __exp2l (long double __x) throw (); extern long double log2l (long double __x) throw (); extern long double __log2l (long double __x) throw (); extern long double powl (long double __x, long double __y) throw (); extern long double __powl (long double __x, long double __y) throw (); extern long double sqrtl (long double __x) throw (); extern long double __sqrtl (long double __x) throw (); extern long double hypotl (long double __x, long double __y) throw (); extern long double __hypotl (long double __x, long double __y) throw (); extern long double cbrtl (long double __x) throw (); extern long double __cbrtl (long double __x) throw (); extern long double ceill (long double __x) throw () __attribute__ ((__const__)); extern long double __ceill (long double __x) throw () __attribute__ ((__const__)); extern long double fabsl (long double __x) throw () __attribute__ ((__const__)); extern long double __fabsl (long double __x) throw () __attribute__ ((__const__)); extern long double floorl (long double __x) throw () __attribute__ ((__const__)); extern long double __floorl (long double __x) throw () __attribute__ ((__const__)); extern long double fmodl (long double __x, long double __y) throw (); extern long double __fmodl (long double __x, long double __y) throw (); extern int __isinfl (long double __value) throw () __attribute__ ((__const__)); extern int __finitel (long double __value) throw () __attribute__ ((__const__)); extern int isinfl (long double __value) throw () __attribute__ ((__const__)); extern int finitel (long double __value) throw () __attribute__ ((__const__)); extern long double dreml (long double __x, long double __y) throw (); extern long double __dreml (long double __x, long double __y) throw (); extern long double significandl (long double __x) throw (); extern long double __significandl (long double __x) throw (); extern long double copysignl (long double __x, long double __y) throw () __attribute__ ((__const__)); extern long double __copysignl (long double __x, long double __y) throw () __attribute__ ((__const__)); extern long double nanl (__const char *__tagb) throw () __attribute__ ((__const__)); extern long double __nanl (__const char *__tagb) throw () __attribute__ ((__const__)); extern int __isnanl (long double __value) throw () __attribute__ ((__const__)); extern int isnanl (long double __value) throw () __attribute__ ((__const__)); extern long double j0l (long double) throw (); extern long double __j0l (long double) throw (); extern long double j1l (long double) throw (); extern long double __j1l (long double) throw (); extern long double jnl (int, long double) throw (); extern long double __jnl (int, long double) throw (); extern long double y0l (long double) throw (); extern long double __y0l (long double) throw (); extern long double y1l (long double) throw (); extern long double __y1l (long double) throw (); extern long double ynl (int, long double) throw (); extern long double __ynl (int, long double) throw (); extern long double erfl (long double) throw (); extern long double __erfl (long double) throw (); extern long double erfcl (long double) throw (); extern long double __erfcl (long double) throw (); extern long double lgammal (long double) throw (); extern long double __lgammal (long double) throw (); extern long double tgammal (long double) throw (); extern long double __tgammal (long double) throw (); extern long double gammal (long double) throw (); extern long double __gammal (long double) throw (); extern long double lgammal_r (long double, int *__signgamp) throw (); extern long double __lgammal_r (long double, int *__signgamp) throw (); extern long double rintl (long double __x) throw (); extern long double __rintl (long double __x) throw (); extern long double nextafterl (long double __x, long double __y) throw () __attribute__ ((__const__)); extern long double __nextafterl (long double __x, long double __y) throw () __attribute__ ((__const__)); extern long double nexttowardl (long double __x, long double __y) throw () __attribute__ ((__const__)); extern long double __nexttowardl (long double __x, long double __y) throw () __attribute__ ((__const__)); extern long double remainderl (long double __x, long double __y) throw (); extern long double __remainderl (long double __x, long double __y) throw (); extern long double scalbnl (long double __x, int __n) throw (); extern long double __scalbnl (long double __x, int __n) throw (); extern int ilogbl (long double __x) throw (); extern int __ilogbl (long double __x) throw (); extern long double scalblnl (long double __x, long int __n) throw (); extern long double __scalblnl (long double __x, long int __n) throw (); extern long double nearbyintl (long double __x) throw (); extern long double __nearbyintl (long double __x) throw (); extern long double roundl (long double __x) throw () __attribute__ ((__const__)); extern long double __roundl (long double __x) throw () __attribute__ ((__const__)); extern long double truncl (long double __x) throw () __attribute__ ((__const__)); extern long double __truncl (long double __x) throw () __attribute__ ((__const__)); extern long double remquol (long double __x, long double __y, int *__quo) throw (); extern long double __remquol (long double __x, long double __y, int *__quo) throw (); extern long int lrintl (long double __x) throw (); extern long int __lrintl (long double __x) throw (); extern long long int llrintl (long double __x) throw (); extern long long int __llrintl (long double __x) throw (); extern long int lroundl (long double __x) throw (); extern long int __lroundl (long double __x) throw (); extern long long int llroundl (long double __x) throw (); extern long long int __llroundl (long double __x) throw (); extern long double fdiml (long double __x, long double __y) throw (); extern long double __fdiml (long double __x, long double __y) throw (); extern long double fmaxl (long double __x, long double __y) throw (); extern long double __fmaxl (long double __x, long double __y) throw (); extern long double fminl (long double __x, long double __y) throw (); extern long double __fminl (long double __x, long double __y) throw (); extern int __fpclassifyl (long double __value) throw () __attribute__ ((__const__)); extern int __signbitl (long double __value) throw () __attribute__ ((__const__)); extern long double fmal (long double __x, long double __y, long double __z) throw (); extern long double __fmal (long double __x, long double __y, long double __z) throw (); extern long double scalbl (long double __x, long double __n) throw (); extern long double __scalbl (long double __x, long double __n) throw (); # 110 "/usr/include/math.h" 2 3 4 # 125 "/usr/include/math.h" 3 4 extern int signgam; # 166 "/usr/include/math.h" 3 4 enum { FP_NAN, FP_INFINITE, FP_ZERO, FP_SUBNORMAL, FP_NORMAL }; # 252 "/usr/include/math.h" 3 4 typedef enum { _IEEE_ = -1, _SVID_, _XOPEN_, _POSIX_, _ISOC_ } _LIB_VERSION_TYPE; extern _LIB_VERSION_TYPE _LIB_VERSION; # 275 "/usr/include/math.h" 3 4 struct __exception { int type; char *name; double arg1; double arg2; double retval; }; extern int matherr (struct __exception *__exc) throw (); # 423 "/usr/include/math.h" 3 4 } # 2 "huge.cpp" 2 # 1 "/usr/include/stdio.h" 1 3 4 # 30 "/usr/include/stdio.h" 3 4 extern "C" { # 1 "/usr/lib/gcc/i486-linux-gnu/4.0.1/include/stddef.h" 1 3 4 # 214 "/usr/lib/gcc/i486-linux-gnu/4.0.1/include/stddef.h" 3 4 typedef unsigned int size_t; # 35 "/usr/include/stdio.h" 2 3 4 # 1 "/usr/include/bits/types.h" 1 3 4 # 28 "/usr/include/bits/types.h" 3 4 # 1 "/usr/include/bits/wordsize.h" 1 3 4 # 29 "/usr/include/bits/types.h" 2 3 4 # 1 "/usr/lib/gcc/i486-linux-gnu/4.0.1/include/stddef.h" 1 3 4 # 32 "/usr/include/bits/types.h" 2 3 4 typedef unsigned char __u_char; typedef unsigned short int __u_short; typedef unsigned int __u_int; typedef unsigned long int __u_long; typedef signed char __int8_t; typedef unsigned char __uint8_t; typedef signed short int __int16_t; typedef unsigned short int __uint16_t; typedef signed int __int32_t; typedef unsigned int __uint32_t; __extension__ typedef signed long long int __int64_t; __extension__ typedef unsigned long long int __uint64_t; __extension__ typedef long long int __quad_t; __extension__ typedef unsigned long long int __u_quad_t; # 129 "/usr/include/bits/types.h" 3 4 # 1 "/usr/include/bits/typesizes.h" 1 3 4 # 130 "/usr/include/bits/types.h" 2 3 4 __extension__ typedef unsigned long long int __dev_t; __extension__ typedef unsigned int __uid_t; __extension__ typedef unsigned int __gid_t; __extension__ typedef unsigned long int __ino_t; __extension__ typedef unsigned long long int __ino64_t; __extension__ typedef unsigned int __mode_t; __extension__ typedef unsigned int __nlink_t; __extension__ typedef long int __off_t; __extension__ typedef long long int __off64_t; __extension__ typedef int __pid_t; __extension__ typedef struct { int __val[2]; } __fsid_t; __extension__ typedef long int __clock_t; __extension__ typedef unsigned long int __rlim_t; __extension__ typedef unsigned long long int __rlim64_t; __extension__ typedef unsigned int __id_t; __extension__ typedef long int __time_t; __extension__ typedef unsigned int __useconds_t; __extension__ typedef long int __suseconds_t; __extension__ typedef int __daddr_t; __extension__ typedef long int __swblk_t; __extension__ typedef int __key_t; __extension__ typedef int __clockid_t; __extension__ typedef int __timer_t; __extension__ typedef long int __blksize_t; __extension__ typedef long int __blkcnt_t; __extension__ typedef long long int __blkcnt64_t; __extension__ typedef unsigned long int __fsblkcnt_t; __extension__ typedef unsigned long long int __fsblkcnt64_t; __extension__ typedef unsigned long int __fsfilcnt_t; __extension__ typedef unsigned long long int __fsfilcnt64_t; __extension__ typedef int __ssize_t; typedef __off64_t __loff_t; typedef __quad_t *__qaddr_t; typedef char *__caddr_t; __extension__ typedef int __intptr_t; __extension__ typedef unsigned int __socklen_t; # 37 "/usr/include/stdio.h" 2 3 4 typedef struct _IO_FILE FILE; # 62 "/usr/include/stdio.h" 3 4 typedef struct _IO_FILE __FILE; # 72 "/usr/include/stdio.h" 3 4 # 1 "/usr/include/libio.h" 1 3 4 # 32 "/usr/include/libio.h" 3 4 # 1 "/usr/include/_G_config.h" 1 3 4 # 14 "/usr/include/_G_config.h" 3 4 # 1 "/usr/lib/gcc/i486-linux-gnu/4.0.1/include/stddef.h" 1 3 4 # 355 "/usr/lib/gcc/i486-linux-gnu/4.0.1/include/stddef.h" 3 4 typedef unsigned int wint_t; # 15 "/usr/include/_G_config.h" 2 3 4 # 24 "/usr/include/_G_config.h" 3 4 # 1 "/usr/include/wchar.h" 1 3 4 # 48 "/usr/include/wchar.h" 3 4 # 1 "/usr/lib/gcc/i486-linux-gnu/4.0.1/include/stddef.h" 1 3 4 # 49 "/usr/include/wchar.h" 2 3 4 # 1 "/usr/include/bits/wchar.h" 1 3 4 # 51 "/usr/include/wchar.h" 2 3 4 # 76 "/usr/include/wchar.h" 3 4 typedef struct { int __count; union { wint_t __wch; char __wchb[4]; } __value; } __mbstate_t; # 25 "/usr/include/_G_config.h" 2 3 4 typedef struct { __off_t __pos; __mbstate_t __state; } _G_fpos_t; typedef struct { __off64_t __pos; __mbstate_t __state; } _G_fpos64_t; # 44 "/usr/include/_G_config.h" 3 4 # 1 "/usr/include/gconv.h" 1 3 4 # 28 "/usr/include/gconv.h" 3 4 # 1 "/usr/include/wchar.h" 1 3 4 # 48 "/usr/include/wchar.h" 3 4 # 1 "/usr/lib/gcc/i486-linux-gnu/4.0.1/include/stddef.h" 1 3 4 # 49 "/usr/include/wchar.h" 2 3 4 # 29 "/usr/include/gconv.h" 2 3 4 # 1 "/usr/lib/gcc/i486-linux-gnu/4.0.1/include/stddef.h" 1 3 4 # 32 "/usr/include/gconv.h" 2 3 4 enum { __GCONV_OK = 0, __GCONV_NOCONV, __GCONV_NODB, __GCONV_NOMEM, __GCONV_EMPTY_INPUT, __GCONV_FULL_OUTPUT, __GCONV_ILLEGAL_INPUT, __GCONV_INCOMPLETE_INPUT, __GCONV_ILLEGAL_DESCRIPTOR, __GCONV_INTERNAL_ERROR }; enum { __GCONV_IS_LAST = 0x0001, __GCONV_IGNORE_ERRORS = 0x0002 }; struct __gconv_step; struct __gconv_step_data; struct __gconv_loaded_object; struct __gconv_trans_data; typedef int (*__gconv_fct) (struct __gconv_step *, struct __gconv_step_data *, __const unsigned char **, __const unsigned char *, unsigned char **, size_t *, int, int); typedef wint_t (*__gconv_btowc_fct) (struct __gconv_step *, unsigned char); typedef int (*__gconv_init_fct) (struct __gconv_step *); typedef void (*__gconv_end_fct) (struct __gconv_step *); typedef int (*__gconv_trans_fct) (struct __gconv_step *, struct __gconv_step_data *, void *, __const unsigned char *, __const unsigned char **, __const unsigned char *, unsigned char **, size_t *); typedef int (*__gconv_trans_context_fct) (void *, __const unsigned char *, __const unsigned char *, unsigned char *, unsigned char *); typedef int (*__gconv_trans_query_fct) (__const char *, __const char ***, size_t *); typedef int (*__gconv_trans_init_fct) (void **, const char *); typedef void (*__gconv_trans_end_fct) (void *); struct __gconv_trans_data { __gconv_trans_fct __trans_fct; __gconv_trans_context_fct __trans_context_fct; __gconv_trans_end_fct __trans_end_fct; void *__data; struct __gconv_trans_data *__next; }; struct __gconv_step { struct __gconv_loaded_object *__shlib_handle; __const char *__modname; int __counter; char *__from_name; char *__to_name; __gconv_fct __fct; __gconv_btowc_fct __btowc_fct; __gconv_init_fct __init_fct; __gconv_end_fct __end_fct; int __min_needed_from; int __max_needed_from; int __min_needed_to; int __max_needed_to; int __stateful; void *__data; }; struct __gconv_step_data { unsigned char *__outbuf; unsigned char *__outbufend; int __flags; int __invocation_counter; int __internal_use; __mbstate_t *__statep; __mbstate_t __state; struct __gconv_trans_data *__trans; }; typedef struct __gconv_info { size_t __nsteps; struct __gconv_step *__steps; __extension__ struct __gconv_step_data __data []; } *__gconv_t; # 45 "/usr/include/_G_config.h" 2 3 4 typedef union { struct __gconv_info __cd; struct { struct __gconv_info __cd; struct __gconv_step_data __data; } __combined; } _G_iconv_t; typedef int _G_int16_t __attribute__ ((__mode__ (__HI__))); typedef int _G_int32_t __attribute__ ((__mode__ (__SI__))); typedef unsigned int _G_uint16_t __attribute__ ((__mode__ (__HI__))); typedef unsigned int _G_uint32_t __attribute__ ((__mode__ (__SI__))); # 33 "/usr/include/libio.h" 2 3 4 # 53 "/usr/include/libio.h" 3 4 # 1 "/usr/lib/gcc/i486-linux-gnu/4.0.1/include/stdarg.h" 1 3 4 # 43 "/usr/lib/gcc/i486-linux-gnu/4.0.1/include/stdarg.h" 3 4 typedef __builtin_va_list __gnuc_va_list; # 54 "/usr/include/libio.h" 2 3 4 # 163 "/usr/include/libio.h" 3 4 struct _IO_jump_t; struct _IO_FILE; # 173 "/usr/include/libio.h" 3 4 typedef void _IO_lock_t; struct _IO_marker { struct _IO_marker *_next; struct _IO_FILE *_sbuf; int _pos; # 196 "/usr/include/libio.h" 3 4 }; enum __codecvt_result { __codecvt_ok, __codecvt_partial, __codecvt_error, __codecvt_noconv }; # 264 "/usr/include/libio.h" 3 4 struct _IO_FILE { int _flags; char* _IO_read_ptr; char* _IO_read_end; char* _IO_read_base; char* _IO_write_base; char* _IO_write_ptr; char* _IO_write_end; char* _IO_buf_base; char* _IO_buf_end; char *_IO_save_base; char *_IO_backup_base; char *_IO_save_end; struct _IO_marker *_markers; struct _IO_FILE *_chain; int _fileno; int _flags2; __off_t _old_offset; unsigned short _cur_column; signed char _vtable_offset; char _shortbuf[1]; _IO_lock_t *_lock; # 312 "/usr/include/libio.h" 3 4 __off64_t _offset; void *__pad1; void *__pad2; int _mode; char _unused2[15 * sizeof (int) - 2 * sizeof (void *)]; }; struct _IO_FILE_plus; extern struct _IO_FILE_plus _IO_2_1_stdin_; extern struct _IO_FILE_plus _IO_2_1_stdout_; extern struct _IO_FILE_plus _IO_2_1_stderr_; # 351 "/usr/include/libio.h" 3 4 typedef __ssize_t __io_read_fn (void *__cookie, char *__buf, size_t __nbytes); typedef __ssize_t __io_write_fn (void *__cookie, __const char *__buf, size_t __n); typedef int __io_seek_fn (void *__cookie, __off64_t *__pos, int __w); typedef int __io_close_fn (void *__cookie); typedef __io_read_fn cookie_read_function_t; typedef __io_write_fn cookie_write_function_t; typedef __io_seek_fn cookie_seek_function_t; typedef __io_close_fn cookie_close_function_t; typedef struct { __io_read_fn *read; __io_write_fn *write; __io_seek_fn *seek; __io_close_fn *close; } _IO_cookie_io_functions_t; typedef _IO_cookie_io_functions_t cookie_io_functions_t; struct _IO_cookie_file; extern void _IO_cookie_init (struct _IO_cookie_file *__cfile, int __read_write, void *__cookie, _IO_cookie_io_functions_t __fns); extern "C" { extern int __underflow (_IO_FILE *) throw (); extern int __uflow (_IO_FILE *) throw (); extern int __overflow (_IO_FILE *, int) throw (); extern wint_t __wunderflow (_IO_FILE *) throw (); extern wint_t __wuflow (_IO_FILE *) throw (); extern wint_t __woverflow (_IO_FILE *, wint_t) throw (); # 433 "/usr/include/libio.h" 3 4 extern int _IO_getc (_IO_FILE *__fp) throw (); extern int _IO_putc (int __c, _IO_FILE *__fp) throw (); extern int _IO_feof (_IO_FILE *__fp) throw (); extern int _IO_ferror (_IO_FILE *__fp) throw (); extern int _IO_peekc_locked (_IO_FILE *__fp) throw (); extern void _IO_flockfile (_IO_FILE *) throw (); extern void _IO_funlockfile (_IO_FILE *) throw (); extern int _IO_ftrylockfile (_IO_FILE *) throw (); # 463 "/usr/include/libio.h" 3 4 extern int _IO_vfscanf (_IO_FILE * __restrict, const char * __restrict, __gnuc_va_list, int *__restrict) throw (); extern int _IO_vfprintf (_IO_FILE *__restrict, const char *__restrict, __gnuc_va_list) throw (); extern __ssize_t _IO_padn (_IO_FILE *, int, __ssize_t) throw (); extern size_t _IO_sgetn (_IO_FILE *, void *, size_t) throw (); extern __off64_t _IO_seekoff (_IO_FILE *, __off64_t, int, int) throw (); extern __off64_t _IO_seekpos (_IO_FILE *, __off64_t, int) throw (); extern void _IO_free_backup_area (_IO_FILE *) throw (); # 521 "/usr/include/libio.h" 3 4 } # 73 "/usr/include/stdio.h" 2 3 4 typedef __gnuc_va_list va_list; # 86 "/usr/include/stdio.h" 3 4 typedef _G_fpos_t fpos_t; typedef _G_fpos64_t fpos64_t; # 138 "/usr/include/stdio.h" 3 4 # 1 "/usr/include/bits/stdio_lim.h" 1 3 4 # 139 "/usr/include/stdio.h" 2 3 4 extern struct _IO_FILE *stdin; extern struct _IO_FILE *stdout; extern struct _IO_FILE *stderr; extern int remove (__const char *__filename) throw (); extern int rename (__const char *__old, __const char *__new) throw (); extern FILE *tmpfile (void); # 174 "/usr/include/stdio.h" 3 4 extern FILE *tmpfile64 (void); extern char *tmpnam (char *__s) throw (); extern char *tmpnam_r (char *__s) throw (); # 196 "/usr/include/stdio.h" 3 4 extern char *tempnam (__const char *__dir, __const char *__pfx) throw () __attribute__ ((__malloc__)); extern int fclose (FILE *__stream); extern int fflush (FILE *__stream); # 221 "/usr/include/stdio.h" 3 4 extern int fflush_unlocked (FILE *__stream); # 231 "/usr/include/stdio.h" 3 4 extern int fcloseall (void); extern FILE *fopen (__const char *__restrict __filename, __const char *__restrict __modes); extern FILE *freopen (__const char *__restrict __filename, __const char *__restrict __modes, FILE *__restrict __stream); # 262 "/usr/include/stdio.h" 3 4 extern FILE *fopen64 (__const char *__restrict __filename, __const char *__restrict __modes); extern FILE *freopen64 (__const char *__restrict __filename, __const char *__restrict __modes, FILE *__restrict __stream); extern FILE *fdopen (int __fd, __const char *__modes) throw (); extern FILE *fopencookie (void *__restrict __magic_cookie, __const char *__restrict __modes, _IO_cookie_io_functions_t __io_funcs) throw (); extern FILE *fmemopen (void *__s, size_t __len, __const char *__modes) throw (); extern FILE *open_memstream (char **__restrict __bufloc, size_t *__restrict __sizeloc) throw (); extern void setbuf (FILE *__restrict __stream, char *__restrict __buf) throw (); extern int setvbuf (FILE *__restrict __stream, char *__restrict __buf, int __modes, size_t __n) throw (); extern void setbuffer (FILE *__restrict __stream, char *__restrict __buf, size_t __size) throw (); extern void setlinebuf (FILE *__stream) throw (); extern int fprintf (FILE *__restrict __stream, __const char *__restrict __format, ...); extern int printf (__const char *__restrict __format, ...); extern int sprintf (char *__restrict __s, __const char *__restrict __format, ...) throw (); extern int vfprintf (FILE *__restrict __s, __const char *__restrict __format, __gnuc_va_list __arg); extern int vprintf (__const char *__restrict __format, __gnuc_va_list __arg); extern int vsprintf (char *__restrict __s, __const char *__restrict __format, __gnuc_va_list __arg) throw (); extern int snprintf (char *__restrict __s, size_t __maxlen, __const char *__restrict __format, ...) throw () __attribute__ ((__format__ (__printf__, 3, 4))); extern int vsnprintf (char *__restrict __s, size_t __maxlen, __const char *__restrict __format, __gnuc_va_list __arg) throw () __attribute__ ((__format__ (__printf__, 3, 0))); extern int vasprintf (char **__restrict __ptr, __const char *__restrict __f, __gnuc_va_list __arg) throw () __attribute__ ((__format__ (__printf__, 2, 0))); extern int __asprintf (char **__restrict __ptr, __const char *__restrict __fmt, ...) throw () __attribute__ ((__format__ (__printf__, 2, 3))); extern int asprintf (char **__restrict __ptr, __const char *__restrict __fmt, ...) throw () __attribute__ ((__format__ (__printf__, 2, 3))); extern int vdprintf (int __fd, __const char *__restrict __fmt, __gnuc_va_list __arg) __attribute__ ((__format__ (__printf__, 2, 0))); extern int dprintf (int __fd, __const char *__restrict __fmt, ...) __attribute__ ((__format__ (__printf__, 2, 3))); extern int fscanf (FILE *__restrict __stream, __const char *__restrict __format, ...); extern int scanf (__const char *__restrict __format, ...); extern int sscanf (__const char *__restrict __s, __const char *__restrict __format, ...) throw (); extern int vfscanf (FILE *__restrict __s, __const char *__restrict __format, __gnuc_va_list __arg) __attribute__ ((__format__ (__scanf__, 2, 0))); extern int vscanf (__const char *__restrict __format, __gnuc_va_list __arg) __attribute__ ((__format__ (__scanf__, 1, 0))); extern int vsscanf (__const char *__restrict __s, __const char *__restrict __format, __gnuc_va_list __arg) throw () __attribute__ ((__format__ (__scanf__, 2, 0))); extern int fgetc (FILE *__stream); extern int getc (FILE *__stream); extern int getchar (void); # 454 "/usr/include/stdio.h" 3 4 extern int getc_unlocked (FILE *__stream); extern int getchar_unlocked (void); # 465 "/usr/include/stdio.h" 3 4 extern int fgetc_unlocked (FILE *__stream); extern int fputc (int __c, FILE *__stream); extern int putc (int __c, FILE *__stream); extern int putchar (int __c); # 498 "/usr/include/stdio.h" 3 4 extern int fputc_unlocked (int __c, FILE *__stream); extern int putc_unlocked (int __c, FILE *__stream); extern int putchar_unlocked (int __c); extern int getw (FILE *__stream); extern int putw (int __w, FILE *__stream); extern char *fgets (char *__restrict __s, int __n, FILE *__restrict __stream); extern char *gets (char *__s); # 543 "/usr/include/stdio.h" 3 4 extern char *fgets_unlocked (char *__restrict __s, int __n, FILE *__restrict __stream); # 559 "/usr/include/stdio.h" 3 4 extern __ssize_t __getdelim (char **__restrict __lineptr, size_t *__restrict __n, int __delimiter, FILE *__restrict __stream); extern __ssize_t getdelim (char **__restrict __lineptr, size_t *__restrict __n, int __delimiter, FILE *__restrict __stream); extern __ssize_t getline (char **__restrict __lineptr, size_t *__restrict __n, FILE *__restrict __stream); extern int fputs (__const char *__restrict __s, FILE *__restrict __stream); extern int puts (__const char *__s); extern int ungetc (int __c, FILE *__stream); extern size_t fread (void *__restrict __ptr, size_t __size, size_t __n, FILE *__restrict __stream); extern size_t fwrite (__const void *__restrict __ptr, size_t __size, size_t __n, FILE *__restrict __s); # 620 "/usr/include/stdio.h" 3 4 extern int fputs_unlocked (__const char *__restrict __s, FILE *__restrict __stream); # 631 "/usr/include/stdio.h" 3 4 extern size_t fread_unlocked (void *__restrict __ptr, size_t __size, size_t __n, FILE *__restrict __stream); extern size_t fwrite_unlocked (__const void *__restrict __ptr, size_t __size, size_t __n, FILE *__restrict __stream); extern int fseek (FILE *__stream, long int __off, int __whence); extern long int ftell (FILE *__stream); extern void rewind (FILE *__stream); # 667 "/usr/include/stdio.h" 3 4 extern int fseeko (FILE *__stream, __off_t __off, int __whence); extern __off_t ftello (FILE *__stream); # 686 "/usr/include/stdio.h" 3 4 extern int fgetpos (FILE *__restrict __stream, fpos_t *__restrict __pos); extern int fsetpos (FILE *__stream, __const fpos_t *__pos); # 709 "/usr/include/stdio.h" 3 4 extern int fseeko64 (FILE *__stream, __off64_t __off, int __whence); extern __off64_t ftello64 (FILE *__stream); extern int fgetpos64 (FILE *__restrict __stream, fpos64_t *__restrict __pos); extern int fsetpos64 (FILE *__stream, __const fpos64_t *__pos); extern void clearerr (FILE *__stream) throw (); extern int feof (FILE *__stream) throw (); extern int ferror (FILE *__stream) throw (); extern void clearerr_unlocked (FILE *__stream) throw (); extern int feof_unlocked (FILE *__stream) throw (); extern int ferror_unlocked (FILE *__stream) throw (); extern void perror (__const char *__s); # 1 "/usr/include/bits/sys_errlist.h" 1 3 4 # 27 "/usr/include/bits/sys_errlist.h" 3 4 extern int sys_nerr; extern __const char *__const sys_errlist[]; extern int _sys_nerr; extern __const char *__const _sys_errlist[]; # 748 "/usr/include/stdio.h" 2 3 4 extern int fileno (FILE *__stream) throw (); extern int fileno_unlocked (FILE *__stream) throw (); # 767 "/usr/include/stdio.h" 3 4 extern FILE *popen (__const char *__command, __const char *__modes); extern int pclose (FILE *__stream); extern char *ctermid (char *__s) throw (); extern char *cuserid (char *__s); struct obstack; extern int obstack_printf (struct obstack *__restrict __obstack, __const char *__restrict __format, ...) throw () __attribute__ ((__format__ (__printf__, 2, 3))); extern int obstack_vprintf (struct obstack *__restrict __obstack, __const char *__restrict __format, __gnuc_va_list __args) throw () __attribute__ ((__format__ (__printf__, 2, 0))); extern void flockfile (FILE *__stream) throw (); extern int ftrylockfile (FILE *__stream) throw (); extern void funlockfile (FILE *__stream) throw (); # 831 "/usr/include/stdio.h" 3 4 } # 3 "huge.cpp" 2 int main(int argc,char **argv) { double v = (__extension__ 0x1.0p2047); printf("%f\n",v); return 0; }
3.4 produces a warning and not an error, maybe the warning became a pedwarn in 4.0.0 but this should not produce a warning or an error at all. For some reason the C front-end does not produce a warning or an error.
The problem behind both diagnostics fact that the C++ front-end pre-lexes the entire source file. As a result, the lexing routines, which depends on the setting of pedantic to determine whether or not to issue errors, are called when pedantic is set, even though we are within an __extension__ block. Because the parsing of __extension__ blocks is complex, we need to either (a) eliminate the up-front lexing, or (b) defer issuing diagnostics until we are actually in position to know the correct value of pedantic.
Subject: Re: [3.4/4.0/4.1 Regression] -pedantic -ffast-math breaks working code On Tue, 6 Sep 2005, mmitchel at gcc dot gnu dot org wrote: > The problem behind both diagnostics fact that the C++ front-end pre-lexes the > entire source file. As a result, the lexing routines, which depends on the > setting of pedantic to determine whether or not to issue errors, are called when > pedantic is set, even though we are within an __extension__ block. Because the > parsing of __extension__ blocks is complex, we need to either (a) eliminate the > up-front lexing, or (b) defer issuing diagnostics until we are actually in > position to know the correct value of pedantic. The lexing diagnostics depend on the preprocessor's setting of pedantic (which doesn't take account of parser context in any case), not the compiler's. This looks just like 7263/11931 for which I still prefer (c) handle specially expansions of macros defined in system headers. A fixinclude for definitions of HUGE_VAL as a hex float constant is a possible workaround.
Subject: Re: [3.4/4.0/4.1 Regression] -pedantic -ffast-math breaks working code "mmitchel at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> writes: | The problem behind both diagnostics fact that the C++ front-end pre-lexes the | entire source file. As a result, the lexing routines, which depends on the | setting of pedantic to determine whether or not to issue errors, are | called when pedantic is set, even though we are within an | __extension__ block. Because the parsing of __extension__ blocks is | complex, we need to either (a) eliminate the up-front lexing, or (b) | defer issuing diagnostics until we are actually in | position to know the correct value of pedantic. In long term, I believe (b) is a better alternative. -- Gaby
The "floating constant exceeds range" message comes from interpret_float in c-lex.c, which does test just "pedantic", rather than CPP_PEDANTIC(pfile). So, while the preprocessor warning about use of a hexadecimal floating constant does seem to be like the other PRs, the actual pedwarn/error is coming from the fact the C++ front end is pre-lexing tokens. I agree that disabling warnings in expansions of macros from system headers is a good idea, independently of whether or not any other changes might be appropriate to deal with other uses of __extension__. There are certain to be system headers not using __extension__ in macro definitions, on some systems. I guess we could have the preprocessor insert a special token to mark the start/stop of a macro expansion, with an indicator of the location of the macro definition, including its system-headerness. Then, the front end could clear/reset pedantic when seeing these tokens. This would also allow us to issue diagnostics based on the location of the macro, rather than its user, if we wanted. A more brutal approach would be to have the preprocessor simulate #include'ing the file from which the macro came when doing the expansion. That would not require updating the front-ends, but would be more confusing to users.
Subject: Bug 23139 CVSROOT: /cvs/gcc Module name: gcc Changes by: jsm28@gcc.gnu.org 2005-09-15 19:09:28 Modified files: fixincludes : ChangeLog inclhack.def fixincl.x gcc/testsuite : ChangeLog Added files: fixincludes/tests/base/bits: huge_val.h gcc/testsuite/g++.dg/warn: huge-val1.C Log message: fixincludes: PR c++/23139 * inclhack.def (huge_val_hex, huge_valf_hex, huge_vall_hex): New fixes. * fixincl.x: Regenerate. * tests/base/bits/huge_val.h: New file. gcc/testsuite: * g++.dg/warn/huge-val1.C: New test. Patches: http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/fixincludes/ChangeLog.diff?cvsroot=gcc&r1=1.47&r2=1.48 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/fixincludes/inclhack.def.diff?cvsroot=gcc&r1=1.23&r2=1.24 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/fixincludes/fixincl.x.diff?cvsroot=gcc&r1=1.24&r2=1.25 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/fixincludes/tests/base/bits/huge_val.h.diff?cvsroot=gcc&r1=NONE&r2=1.1 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.6067&r2=1.6068 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/warn/huge-val1.C.diff?cvsroot=gcc&r1=NONE&r2=1.1
Subject: Bug 23139 CVSROOT: /cvs/gcc Module name: gcc Branch: gcc-4_0-branch Changes by: jsm28@gcc.gnu.org 2005-09-15 19:12:00 Modified files: fixincludes : ChangeLog inclhack.def fixincl.x gcc/testsuite : ChangeLog Added files: fixincludes/tests/base/bits: huge_val.h gcc/testsuite/g++.dg/warn: huge-val1.C Log message: fixincludes: PR c++/23139 * inclhack.def (huge_val_hex, huge_valf_hex, huge_vall_hex): New fixes. * fixincl.x: Regenerate. * tests/base/bits/huge_val.h: New file. gcc/testsuite: * g++.dg/warn/huge-val1.C: New test. Patches: http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/fixincludes/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=1.32.2.8&r2=1.32.2.9 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/fixincludes/inclhack.def.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=1.16.14.5&r2=1.16.14.6 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/fixincludes/fixincl.x.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=1.16.14.5&r2=1.16.14.6 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/fixincludes/tests/base/bits/huge_val.h.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=NONE&r2=1.1.2.1 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=1.5084.2.405&r2=1.5084.2.406 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/warn/huge-val1.C.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=NONE&r2=1.1.2.1
Only a 3.4.x regression now.
Fixed in 4.0.0 and up.