MdePkg: Check if compiler has __has_builtin before trying to use it
When building AArch64 code, cpp gets run with the `-undef` flag which on
Fedora 40 with gcc version 14.1.1 20240607 (Red Hat 14.1.1-5) causes
__has_builtin to be undefined. When running the check for
__builtin_unreachable in Base.h it causes an error
"missing binary operator before token "("".
Check that we have __has_builtin before trying to use it.
Signed-off-by: Rebecca Cran <rebecca@bsdio.com>
diff --git a/MdePkg/Include/Base.h b/MdePkg/Include/Base.h
index e02970a..7caebbe 100644
--- a/MdePkg/Include/Base.h
+++ b/MdePkg/Include/Base.h
@@ -59,7 +59,7 @@
/// up to the compiler to remove any code past that point.
///
#define UNREACHABLE() __builtin_unreachable ()
- #elif defined (__has_feature)
+ #elif defined (__has_builtin) && defined (__has_feature)
#if __has_builtin (__builtin_unreachable)
///
/// Signal compilers and analyzers that this call is not reachable. It is
