From 6ecf2ccc7b1406b9af000a4d01e6c70737b1fe3e Mon Sep 17 00:00:00 2001
From: Ronnie Sahlberg <ronnie_sahlberg@ozemail.com.au>
Date: Mon, 26 Mar 2007 06:52:04 +0000
Subject: older versions of gcc do not check -W parameters when only running
 the preprocessor.

change the test for whether -Wdeclaration-after-statement so that it also works for ancient gcc



svn path=/trunk/; revision=21205
---
 configure.in | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/configure.in b/configure.in
index a5eb2119a5..afc9ae885f 100644
--- a/configure.in
+++ b/configure.in
@@ -175,12 +175,22 @@ else
 fi
 
 AC_MSG_CHECKING(to see if we can add '-Wdeclaration-after-statement' to CFLAGS)
-if test x$GCC != x && echo yes | $CC -E -Wdeclaration-after-statement - 2>&1 | grep yes > /dev/null ; then
+if test x$GCC == xyes ; then
+  # some versions of GCC support this directive
+  rm -rf conftest*
+  echo "int foo;" >>conftest.c
+  $CC -c -o conftest.o conftest.c -Wdeclaration-after-statement
+  if [ $? == 0 ] ; then
     CFLAGS="$CFLAGS -Wdeclaration-after-statement"
     AC_MSG_RESULT(yes)
+  else
+    AC_MSG_RESULT(no)
+  fi
 else
+  # non-gcc compilers do not support this directive
   AC_MSG_RESULT(no)
 fi
+rm -rf conftest*
 
 AC_ARG_WITH(warnings-as-errors,
 [  --with-warnings-as-errors Treat warnings as errors (if using gcc). [default=no]],
-- 
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