>From 871eca2ee3da0d7a6a35460757954a1d9444e4e8 Mon Sep 17 00:00:00 2001
From: Enrico Weigelt, metux IT service <weigelt@metux.de>
Date: Sun, 28 Mar 2010 16:45:58 +0200
Subject: [PATCH] configure: fixed compile tests

The current tests compiles assume a compiler failure when it gives some
output - thats obviously wrong. This patch fixes this be checking the
compiler's exitcode.

See: http://bugs.gentoo.org/55434
---
 configure |   42 +++++++++++++++++++++++++++++-------------
 1 files changed, 29 insertions(+), 13 deletions(-)

diff --git a/configure b/configure
index bd9edd2..e87ee3a 100755
--- a/configure
+++ b/configure
@@ -229,11 +229,14 @@ SHAREDLIB=${SHAREDLIB-"libz$shared_ext"}
 SHAREDLIBV=${SHAREDLIBV-"libz$shared_ext.$VER"}
 SHAREDLIBM=${SHAREDLIBM-"libz$shared_ext.$VER1"}
 
+##
+## Check for shared libraries
+##
 if test $shared -eq 1; then
   echo Checking for shared library support...
   # we must test in two steps (cc then ld), required at least on SunOS 4.x
-  if test "`($CC -w -c $SFLAGS $test.c) 2>&1`" = "" &&
-     test "`($LDSHARED $SFLAGS -o $test$shared_ext $test.o) 2>&1`" = ""; then
+  if $CC -w -c $SFLAGS $test.c &&
+     $LDSHARED $SFLAGS -o $test$shared_ext $test.o ; then
     echo Building shared library $SHAREDLIBV with $CC.
   elif test -z "$old_cc" -a -z "$old_cflags"; then
     echo No shared library support.
@@ -260,11 +263,14 @@ else
   TEST="all teststatic testshared"
 fi
 
+##
+## Check for off64_t and fseeko()
+##
 cat > $test.c <<EOF
 #include <sys/types.h>
 off64_t dummy = 0;
 EOF
-if test "`($CC -c $CFLAGS -D_LARGEFILE64_SOURCE=1 $test.c) 2>&1`" = ""; then
+if $CC -c $CFLAGS -D_LARGEFILE64_SOURCE=1 $test.c ; then
   CFLAGS="${CFLAGS} -D_LARGEFILE64_SOURCE=1"
   SFLAGS="${SFLAGS} -D_LARGEFILE64_SOURCE=1"
   ALL="${ALL} all64"
@@ -280,7 +286,7 @@ int main(void) {
   return 0;
 }
 EOF
-  if test "`($CC $CFLAGS -o $test $test.c) 2>&1`" = ""; then
+  if $CC $CFLAGS -o $test $test.c ; then
     echo "Checking for fseeko... Yes."
   else
     CFLAGS="${CFLAGS} -DNO_FSEEKO"
@@ -289,13 +295,17 @@ EOF
   fi
 fi
 
+
 cp -p zconf.h.in zconf.h
 
+##
+## Check for <unistd.h>
+##
 cat > $test.c <<EOF
 #include <unistd.h>
 int main() { return 0; }
 EOF
-if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
+if $CC -c $CFLAGS $test.c ; then
   sed < zconf.h "/^#ifdef HAVE_UNISTD_H.* may be/s/def HAVE_UNISTD_H\(.*\) may be/ 1\1 was/" > zconf.temp.h
   mv zconf.temp.h zconf.h
   echo "Checking for unistd.h... Yes."
@@ -303,12 +313,18 @@ else
   echo "Checking for unistd.h... No."
 fi
 
+
 if test $zprefix -eq 1; then
   sed < zconf.h "/#ifdef Z_PREFIX.* may be/s/def Z_PREFIX\(.*\) may be/ 1\1 was/" > zconf.temp.h
   mv zconf.temp.h zconf.h
   echo "Using z_ prefix on all symbols."
 fi
 
+
+##
+## Check for vs[n]printf() or s[n]printf()
+##
+
 cat > $test.c <<EOF
 #include <stdio.h>
 #include <stdarg.h>
@@ -324,7 +340,7 @@ int main()
 }
 EOF
 
-if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
+if $CC -c $CFLAGS $test.c ; then
   echo "Checking whether to use vs[n]printf() or s[n]printf()... using vs[n]printf()."
 
   cat > $test.c <<EOF
@@ -348,7 +364,7 @@ int main()
 }
 EOF
 
-  if test "`($CC $CFLAGS -o $test $test.c) 2>&1`" = ""; then
+  if $CC $CFLAGS -o $test $test.c ; then
     echo "Checking for vsnprintf() in stdio.h... Yes."
 
     cat >$test.c <<EOF
@@ -373,7 +389,7 @@ int main()
 }
 EOF
 
-    if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
+    if $CC -c $CFLAGS $test.c ; then
       echo "Checking for return value of vsnprintf()... Yes."
     else
       CFLAGS="$CFLAGS -DHAS_vsnprintf_void"
@@ -413,7 +429,7 @@ int main()
 }
 EOF
 
-    if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
+    if $CC -c $CFLAGS $test.c ; then
       echo "Checking for return value of vsprintf()... Yes."
     else
       CFLAGS="$CFLAGS -DHAS_vsprintf_void"
@@ -444,7 +460,7 @@ int main()
 }
 EOF
 
-  if test "`($CC $CFLAGS -o $test $test.c) 2>&1`" = ""; then
+  if $CC $CFLAGS -o $test $test.c ; then
     echo "Checking for snprintf() in stdio.h... Yes."
 
     cat >$test.c <<EOF
@@ -463,7 +479,7 @@ int main()
 }
 EOF
 
-    if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
+    if $CC -c $CFLAGS $test.c ; then
       echo "Checking for return value of snprintf()... Yes."
     else
       CFLAGS="$CFLAGS -DHAS_snprintf_void"
@@ -497,7 +513,7 @@ int main()
 }
 EOF
 
-    if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
+    if $CC -c $CFLAGS $test.c ; then
       echo "Checking for return value of sprintf()... Yes."
     else
       CFLAGS="$CFLAGS -DHAS_sprintf_void"
@@ -523,7 +539,7 @@ int main()
   return 0;
 }
 EOF
-  if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
+  if ($CC -c $CFLAGS $test.c) 2>/dev/null; then
     echo "Checking for attribute(visibility) support... Yes."
   else
     CFLAGS="$CFLAGS -DNO_VIZ"
-- 
1.7.1