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Enable improved <tgmath.h> for Clang even when not using C11.

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By using __has_extension(c_generic_selections), we can explicitly test
whether we're dealing with a version of Clang that supports _Generic().
That way we can use the improved <tgmath.h> code, even when not using
-std=c11. This massively reduces the compilation time when invoking
these functions.
This commit is contained in:
Ed Schouten 2013-04-27 21:18:34 +00:00
parent d9e22925e0
commit 5a1d14ca78
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=249995
1 changed files with 2 additions and 1 deletions
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3
include/tgmath.h
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@ -60,7 +60,8 @@
* compilers use an inefficient yet reliable version.
*/
#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
__has_extension(c_generic_selections)
#define __tg_generic(x, cfnl, cfn, cfnf, fnl, fn, fnf) \
_Generic(x, \
long double _Complex: cfnl, \