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sys/cdefs.h: Do not require C++ compilers to define __STDC__

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The check for an ISO C compiler assumes that anything GCC-like will
define __STDC__, even if it's actually a C++ compiler. That's currently
true for G++ and compilers like clang++ that also define __GNUC__, but
it might not always be true.

The C++ standard leaves it implementation-defined whether or not
__STDC__ is defined by C++ compilers. And really the check should be
"ISO C or ISO C++ conforming compiler" anyway. So only give an error if
__GNUC__ is defined and neither __STDC__ nor __cplusplus is defined.

Reviewed-by: Fangrui Song <maskray@google.com>
This commit is contained in:
Jonathan Wakely 2022-05-13 14:16:34 +01:00
parent 61a8753010
commit 21244c70c2
1 changed files with 2 additions and 2 deletions
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4
misc/sys/cdefs.h
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@ -27,8 +27,8 @@
/* The GNU libc does not support any K&R compilers or the traditional mode
of ISO C compilers anymore. Check for some of the combinations not
supported anymore. */
#if defined __GNUC__ && !defined __STDC__
# error "You need a ISO C conforming compiler to use the glibc headers"
#if defined __GNUC__ && !defined __STDC__ && !defined __cplusplus
# error "You need a ISO C or C++ conforming compiler to use the glibc headers"
#endif
/* Some user header file might have defined this before. */