From 0284717b49cbd9a58cf3237f6f4855f2d7b086e6 Mon Sep 17 00:00:00 2001
From: Matt Johnston <matt@ucc.asn.au>
Date: Fri, 23 Jun 2017 21:31:25 +0800
Subject: Compile with -fno-strict-overflow if possible. Needed for
 curve25519-donna https://github.com/agl/curve25519-donna/issues/31

---
 configure.ac | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 767bd05..1e4ea4a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -9,7 +9,7 @@ AC_PREREQ(2.59)
 AC_INIT
 AC_CONFIG_SRCDIR(buffer.c)
 
-OLDCFLAGS=$CFLAGS
+OLDCFLAGS="$CFLAGS"
 # Checks for programs.
 AC_PROG_CC
 AC_PROG_MAKE_SET
@@ -24,6 +24,17 @@ if test -z "$OLDCFLAGS" && test "$GCC" = "yes"; then
 	CFLAGS="-Os -W -Wall -Wno-pointer-sign"
 fi
 
+AC_MSG_CHECKING([if compiler '$CC' supports -fno-strict-overflow])
+OLDCFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -fno-strict-overflow"
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])], 
+    [AC_MSG_RESULT(yes)], 
+    [
+        AC_MSG_RESULT(no)
+        CFLAGS=$OLDCFLAGS
+    ]
+    )
+
 # large file support is useful for scp
 AC_SYS_LARGEFILE
 
-- 
cgit v1.2.1