From ec1c348b4fd67619fa0c2f55ae644f6a8014d971 Mon Sep 17 00:00:00 2001
From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Date: Sun, 19 Sep 2021 21:17:44 +0200
Subject: [PATCH] build: Add reallocarray to missing.h

reallocarray has been added to glibc relatively recently (version 2.26,
from 2017) and apparently not all users run new enough glibc. Moreover,
reallocarray is not available with uclibc-ng. So use realloc if
reallocarray is not available to avoid the following build failure
raised since commit 891b78e9e892a3bcd800eb3a298e6380e9a15dd1:

/home/giuliobenetti/autobuild/run/instance-3/output-1/host/lib/gcc/xtensa-buildroot-linux-uclibc/10.3.0/../../../../xtensa-buildroot-linux-uclibc/bin/ld: src/sae.o: in function `sae_rx_authenticate':
sae.c:(.text+0xd74): undefined reference to `reallocarray'

Fixes:
 - http://autobuild.buildroot.org/results/c6d3f86282c44645b4f1c61882dc63ccfc8eb35a
---
 configure.ac  | 1 +
 src/missing.h | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/configure.ac b/configure.ac
index c6250401..51d9da93 100644
--- a/configure.ac
+++ b/configure.ac
@@ -129,6 +129,7 @@ AC_DEFINE_UNQUOTED(WIRED_STORAGEDIR, "${wired_storagedir}",
 
 AC_CHECK_FUNCS(explicit_bzero)
 AC_CHECK_FUNCS(rawmemchr)
+AC_CHECK_FUNCS(reallocarray)
 
 AC_CHECK_HEADERS(linux/types.h linux/if_alg.h)
 
diff --git a/src/missing.h b/src/missing.h
index 2cc80aee..a5b92952 100644
--- a/src/missing.h
+++ b/src/missing.h
@@ -37,3 +37,10 @@ _Pragma("GCC diagnostic ignored \"-Wstringop-overflow=\"")
 _Pragma("GCC diagnostic pop")
 }
 #endif
+
+#ifndef HAVE_REALLOCARRAY
+static inline void *reallocarray(void *ptr, size_t nmemb, size_t size)
+{
+	return realloc(ptr, nmemb * size);
+}
+#endif