build: Support missing rawmemchr

configure.ac

@@ -128,6 +128,7 @@ AC_DEFINE_UNQUOTED(WIRED_STORAGEDIR, "${wired_storagedir}",
 			[Directory for Ethernet daemon storage files])
 
 AC_CHECK_FUNCS(explicit_bzero)
+AC_CHECK_FUNCS(rawmemchr)
 
 AC_CHECK_HEADERS(linux/types.h linux/if_alg.h)
 

src/missing.h

@@ -27,3 +27,13 @@ static inline void explicit_bzero(void *s, size_t n)
         __asm__ __volatile__ ("" : : "r"(s) : "memory");
 }
 #endif
+
+#ifndef HAVE_RAWMEMCHR
+static inline void *rawmemchr(const void *s, int c)
+{
+_Pragma("GCC diagnostic push")
+_Pragma("GCC diagnostic ignored \"-Wstringop-overflow=\"")
+	return memchr(s, c, (size_t) -1);
+_Pragma("GCC diagnostic pop")
+}
+#endif

src/wiphy.c

@@ -37,6 +37,7 @@
 
 #include "linux/nl80211.h"
 
+#include "src/missing.h"
 #include "src/iwd.h"
 #include "src/module.h"
 #include "src/ie.h"