Fix bug #76392

On systems such as Alpine, Musl libc doesn't provide function attributes.
Compiler (GCC) provides them, but the runtime afterwards doesn't. This
additional check fixes this bug.

Author: petk

configure.ac

@@ -581,8 +581,12 @@ AC_TYPE_UID_T
 dnl Checks for sockaddr_storage and sockaddr.sa_len
 PHP_SOCKADDR_CHECKS
 
-AX_GCC_FUNC_ATTRIBUTE([ifunc])
-AX_GCC_FUNC_ATTRIBUTE([target])
+dnl Checks for function attributes on all systems except ones with musl libc
+dnl Some systems don't have glibc with function attributes, such as Alpine
+AS_CASE([$host_alias], [*musl], [true], [
+  AX_GCC_FUNC_ATTRIBUTE([ifunc])
+  AX_GCC_FUNC_ATTRIBUTE([target])
+])
 
 dnl Check for IPv6 support
 AC_CACHE_CHECK([for IPv6 support], ac_cv_ipv6_support,