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Fix preprocessor checks for Clang builtins 

Clang seems to define built-ins that start with "__builtin_" as
non-keywords, which means that we need to use __has_builtin to detect
them, not __is_identifier. The built-ins that don't start with
"__builtin_" are keywords, and can only be detected using
__is_identifier and not by __has_builtin.

	* include/bits/c++config (_GLIBCXX_HAVE_BUILTIN_LAUNDER)
	(_GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED): Use __has_builtin
	instead of __is_identifier to detect Clang support.

From-SVN: r272931
This commit is contained in:
Jonathan Wakely 2019-07-02 12:50:27 +01:00 committed by Jonathan Wakely
parent fe51b12950
commit 4887c9e808
2 changed files with 9 additions and 3 deletions
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6
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,9 @@
2019-07-02 Jonathan Wakely <jwakely@redhat.com>
* include/bits/c++config (_GLIBCXX_HAVE_BUILTIN_LAUNDER)
(_GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED): Use __has_builtin
instead of __is_identifier to detect Clang support.
2019-07-02 Jim Wilson <jimw@sifive.com>
* configure.ac (BUILD_PDF): Also test for doxygen, dot, xsltproc,

6
libstdc++-v3/include/bits/c++config
View File

@ -636,7 +636,7 @@ namespace std
# if __GNUC__ >= 9
# define _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED 1
# endif
#elif defined(__is_identifier)
#elif defined(__is_identifier) && defined(__has_builtin)
// For non-GNU compilers:
# if ! __is_identifier(__has_unique_object_representations)
# define _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP 1
@ -644,10 +644,10 @@ namespace std
# if ! __is_identifier(__is_aggregate)
# define _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE 1
# endif
# if ! __is_identifier(__builtin_launder)
# if __has_builtin(__builtin_launder)
# define _GLIBCXX_HAVE_BUILTIN_LAUNDER 1
# endif
# if ! __is_identifier(__builtin_is_constant_evaluated)
# if __has_builtin(__builtin_is_constant_evaluated)
# define _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED 1
# endif
#endif // GCC