From 8945667fadc2eb71b7924bb4c5a69507fd362f4a Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Mon, 12 May 2014 14:22:57 -0400
Subject: [PATCH] add configure check for working compiler

without this, broken choices of CC/CPPFLAGS/CFLAGS don't show up until
late in the configure process where they are confusingly reported as a
different failure such as incorrect long double type.
---
 configure | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/configure b/configure
index e8a990b0..5d956723 100755
--- a/configure
+++ b/configure
@@ -189,6 +189,15 @@ trycc ${CROSS_COMPILE}cc
 printf "%s\n" "$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
+printf "yes\n"
+else
+printf "no; compiler output follows:\n%s\n" "$output"
+exit 1
+fi
+
 #
 # Only build musl-gcc wrapper if toolchain does not already target musl
 #
-- 
2.25.1