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<string.h>: Define __CORRECT_ISO_CPP_STRING_H_PROTO for Clang [BZ #25232]

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Without the asm redirects, strchr et al. are not const-correct.

libc++ has a wrapper header that works with and without
__CORRECT_ISO_CPP_STRING_H_PROTO (using a Clang extension).  But when
Clang is used with libstdc++ or just C headers, the overloaded functions
with the correct types are not declared.

This change does not impact current GCC (with libstdc++ or libc++).

(cherry picked from commit 953ceff17a)
This commit is contained in:
Kamlesh Kumar 2019-12-05 16:49:00 +01:00 committed by Fangrui Song
parent 20f6c92422
commit 2fa202fdd1
1 changed files with 2 additions and 1 deletions
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string/string.h
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@ -33,7 +33,8 @@ __BEGIN_DECLS
#include <stddef.h>
/* Tell the caller that we provide correct C++ prototypes. */
#if defined __cplusplus && __GNUC_PREREQ (4, 4)
#if defined __cplusplus && (__GNUC_PREREQ (4, 4) \
|| __glibc_clang_prereq (3, 5))
# define __CORRECT_ISO_CPP_STRING_H_PROTO
#endif