[Bug libstdc++/69881] with gcc-6 of today building gcc-4.9 fails

[bernd.edlinger at hotmail dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69881

--- Comment #16 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
> But it does not look like the c_std headers are currently working.
> I've got symlinks to non-existing c_std header files:
> 
>   ccomplex
>   cfenv
>   cinttypes
>   cstdalign
>   cstdbool
>   cstdint
>   ctgmath
> 
> and c_std/cmath is missing the _GLIBCXX_USE_C99_FENV_TR1 stuff.
> which I need, because my math.h supports that.
> 
> Once I fix these bugs the boot-strap seems to work.
> Let's see if the libstdc++ testsuite has complaints.
> 
> Probably it will, there are many more differences
> between c_global/cmath and c_std/cmath like:
> 
> -#ifndef __CORRECT_ISO_CPP_MATH_H_PROTO
> -  inline _GLIBCXX_CONSTEXPR double
> +  inline double
>    abs(double __x)
>    { return __builtin_fabs(__x); }
> -#endif
>  
> 
> but these dont make the boot-strap fail.

not too bad:

                === libstdc++ tests ===


Running target unix
FAIL: 17_intro/freestanding.cc (test for excess errors)
UNRESOLVED: 17_intro/freestanding.cc compilation failed to produce executable
FAIL: 17_intro/headers/c++1998/complex.cc (test for excess errors)
FAIL: 26_numerics/headers/cmath/14608.cc (test for excess errors)
FAIL: 26_numerics/headers/cmath/60401.cc (test for excess errors)
FAIL: 26_numerics/headers/cmath/c99_classification_macros_c++11.cc (test for
excess errors)
FAIL: 26_numerics/headers/cmath/c99_classification_macros_c.cc (test for excess
errors)
FAIL: 26_numerics/headers/cmath/dr550.cc (test for excess errors)
UNRESOLVED: 26_numerics/headers/cmath/dr550.cc compilation failed to produce
executable
FAIL: 26_numerics/headers/cstdlib/60401.cc (test for excess errors)
FAIL: experimental/numeric/gcd.cc (test for excess errors)
FAIL: experimental/numeric/lcm.cc (test for excess errors)
FAIL: special_functions/01_assoc_laguerre/compile_2.cc (test for excess errors)
FAIL: special_functions/02_assoc_legendre/compile_2.cc (test for excess errors)
FAIL: special_functions/03_beta/compile_2.cc (test for excess errors)
FAIL: special_functions/04_comp_ellint_1/compile_2.cc (test for excess errors)
FAIL: special_functions/05_comp_ellint_2/compile_2.cc (test for excess errors)
FAIL: special_functions/06_comp_ellint_3/compile_2.cc (test for excess errors)
FAIL: special_functions/07_cyl_bessel_i/compile_2.cc (test for excess errors)
FAIL: special_functions/08_cyl_bessel_j/compile_2.cc (test for excess errors)
FAIL: special_functions/09_cyl_bessel_k/compile_2.cc (test for excess errors)
FAIL: special_functions/10_cyl_neumann/compile_2.cc (test for excess errors)
FAIL: special_functions/11_ellint_1/compile_2.cc (test for excess errors)
FAIL: special_functions/12_ellint_2/compile_2.cc (test for excess errors)
FAIL: special_functions/13_ellint_3/compile_2.cc (test for excess errors)
FAIL: special_functions/14_expint/compile_2.cc (test for excess errors)
FAIL: special_functions/15_hermite/compile_2.cc (test for excess errors)
FAIL: special_functions/16_laguerre/compile_2.cc (test for excess errors)
FAIL: special_functions/17_legendre/compile_2.cc (test for excess errors)
FAIL: special_functions/18_riemann_zeta/compile_2.cc (test for excess errors)
FAIL: special_functions/19_sph_bessel/compile_2.cc (test for excess errors)
FAIL: special_functions/20_sph_legendre/compile_2.cc (test for excess errors)
FAIL: special_functions/21_sph_neumann/compile_2.cc (test for excess errors)
FAIL: tr1/8_c_compatibility/cmath/overloads.cc (test for excess errors)

                === libstdc++ Summary ===

# of expected passes            10514
# of unexpected failures        32
# of expected failures          67
# of unresolved testcases       2
# of unsupported tests          540