[libc++] Guard include of <features.h> with __has_include (#127691) · llvm/llvm-project@d420bf8 (original) (raw)

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@@ -32,12 +32,14 @@
32 32
33 33 // Need to detect which libc we're using if we're on Linux.
34 34 #if defined(__linux__) | defined(__AMDGPU__)
35 -# include <features.h>
36 -# if defined(__GLIBC_PREREQ)
37 -# define _LIBCPP_GLIBC_PREREQ(a, b) __GLIBC_PREREQ(a, b)
38 -# else
39 -# define _LIBCPP_GLIBC_PREREQ(a, b) 0
40 -# endif // defined(__GLIBC_PREREQ)
35 +# if __has_include(<features.h>)
36 +# include <features.h>
37 +# if defined(__GLIBC_PREREQ)
38 +# define _LIBCPP_GLIBC_PREREQ(a, b) __GLIBC_PREREQ(a, b)
39 +# else
40 +# define _LIBCPP_GLIBC_PREREQ(a, b) 0
41 +# endif // defined(__GLIBC_PREREQ)
42 +# endif
41 43 #endif
42 44
43 45 #ifndef __BYTE_ORDER__