From: Frank Mehnert &lt;frank.mehnert(a)kernkonzept.com&gt; Clang-19 defines NAN in <float.h>. Check if NAN is already defined to prevent a compiler warning. Change-Id: I29ebcb2a7a0c1eade46a73074a1701ea67869128 Signed-off-by: Marcus Haehnel &lt;marcus.haehnel(a)kernkonzept.com&gt; --- libc/sysdeps/linux/common/bits/nan.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/libc/sysdeps/linux/common/bits/nan.h b/libc/sysdeps/linux/common/bits/nan.h index 00cb405f1..46cfb613f 100644 --- a/libc/sysdeps/linux/common/bits/nan.h +++ b/libc/sysdeps/linux/common/bits/nan.h @@ -25,7 +25,9 @@ #if __GNUC_PREREQ(3,3) -# define NAN (__builtin_nanf ("")) +# ifndef NAN +# define NAN (__builtin_nanf ("")) +# endif #elif defined __GNUC__ -- 2.47.1