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r217420 - in /trunk/gcc: ChangeLog c-family/Cha...
- From: jsm28 at gcc dot gnu dot org
- To: gcc-cvs at gcc dot gnu dot org
- Date: Wed, 12 Nov 2014 13:33:45 -0000
- Subject: r217420 - in /trunk/gcc: ChangeLog c-family/Cha...
Author: jsm28
Date: Wed Nov 12 13:33:45 2014
New Revision: 217420
URL: https://gcc.gnu.org/viewcvs?rev=217420&root=gcc&view=rev
Log:
Predefine __NO_MATH_ERRNO__ for -fno-math-errno.
This patch adds a predefined macro __NO_MATH_ERRNO__ for when
-fno-math-errno is passed or implied. This allows math.h to provide a
more accurate definition of the C99 math_errhandling macro that takes
this option into account, and allows for choice of libm functions to
be optimized at compile time based on this option.
(There may be a case for such interfaces for -fno-rounding-math
(default) and -fno-trapping-math as well, but as C99 standard pragmas
would allow those to vary on a per-block basis, predefined macros
would be problematic as the interface; you can't select a
-fno-trapping-math or -fno-rounding-math version of a function in a
standard header if a conforming program could then use "#pragma STDC
FENV_ACCESS ON" to require a -ftrapping-math -frounding-math version
in a particular block. So built-in functions might be a better way of
providing access to information about those options.)
Bootstrapped with no regressions on x86_64-unknown-linux-gnu. OK to
commit?
* cppbuiltin.c (define_builtin_macros_for_compilation_flags):
Define __NO_MATH_ERRNO__ if -fno-math-errno.
* doc/cpp.texi (__NO_MATH_ERRNO__): Document predefined macro.
c-family:
* c-cppbuiltin.c (c_cpp_builtins_optimize_pragma): Define and
undefine __NO_MATH_ERRNO__ based on changes to -fmath-errno state.
testsuite:
* gcc.dg/no-math-errno-1.c, gcc.dg/no-math-errno-2.c,
gcc.dg/no-math-errno-3.c, gcc.dg/no-math-errno-4.c: New tests.
Added:
trunk/gcc/testsuite/gcc.dg/no-math-errno-1.c
trunk/gcc/testsuite/gcc.dg/no-math-errno-2.c
trunk/gcc/testsuite/gcc.dg/no-math-errno-3.c
trunk/gcc/testsuite/gcc.dg/no-math-errno-4.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/c-family/ChangeLog
trunk/gcc/c-family/c-cppbuiltin.c
trunk/gcc/cppbuiltin.c
trunk/gcc/doc/cpp.texi
trunk/gcc/testsuite/ChangeLog