[PATCH] configure: check whether linker works too

[Laine Gholson <laine.gholson@gmail.com>]

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As a result of http://www.openwall.com/lists/musl/2016/10/22/3
it has been shown that musl's current compiler sanity checks
are inadequate. This patch checks if the compiler as a whole
works properly, and moves the CPPFLAGS/CFLAGS/LDFLAGS sanity
checks after the 'compiler works' check.

Patch and patch signature attached

Thanks,
  Laine Gholson

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From 99fd54d6f2b7c84a02c1ca0d5f1397d709c14313 Mon Sep 17 00:00:00 2001
From: Laine Gholson <laine.gholson@gmail.com>
Date: Mon, 24 Oct 2016 17:49:58 -0500
Subject: [PATCH] configure: check whether linker works too

and move flag sanity checks to a seperate test
---
 configure | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 707eb12..e7d565c 100755
--- a/configure
+++ b/configure
@@ -236,8 +236,17 @@ printf "%s\n" "$CC"
 test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
 
 printf "checking whether C compiler works... "
-echo "typedef int x;" > "$tmpc"
-if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then
+echo 'int main(void) { return 0; }' > "$tmpc"
+if output=$($CC -o /dev/null "$tmpc" 2>&1) ; then
+printf "yes\n"
+else
+printf "no; compiler output follows:\n%s\n" "$output"
+exit 1
+fi
+
+printf 'checking whether *FLAGS are sane... '
+echo 'int main(void) { return 0; }' > "$tmpc"
+if output=$($CC $CFLAGS $CPPFLAGS $LDFLAGS -o /dev/null "$tmpc" 2>&1) ; then
 printf "yes\n"
 else
 printf "no; compiler output follows:\n%s\n" "$output"
-- 
2.10.1


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