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[libc] Keep headers compatible with -std=c89 mode #121981

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Merged
merged 2 commits into from
Jan 7, 2025
Merged

[libc] Keep headers compatible with -std=c89 mode #121981

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[libc] Keep headers compatible with -std=c89 mode
frobtech Jan 7, 2025
4136647
Merge branch 'main' into p/libc-restrict-macro
frobtech Jan 7, 2025
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9 changes: 8 additions & 1 deletion libc/include/__llvm-libc-common.h
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Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,14 @@
#define __END_C_DECLS

#undef __restrict
#define __restrict restrict // C99 and above support the restrict keyword.
#if __STDC_VERSION__ >= 199901L
// C99 and above support the restrict keyword.
#define __restrict restrict
#elif !defined(__GNUC__)
// GNU-compatible compilers accept the __ spelling in all modes.
// Otherwise, omit the qualifier for pure C89 compatibility.
#define __restrict
#endif

#undef _Noreturn
#if __STDC_VERSION__ >= 201112L
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