configure.ac: consolidate stripping unwanted LLVM flags

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>

configure.ac

@@ -1641,6 +1641,19 @@ AC_ARG_WITH([llvm-prefix],
     [llvm_prefix=""])
 
 
+# Call this inside ` ` to get the return value.
+# $1 is the llvm-config command with arguments.
+strip_unwanted_llvm_flags() {
+    echo `$1` | sed \
+	-e 's/-DNDEBUG\>//g' \
+	-e 's/-pedantic//g' \
+	-e 's/-Wcovered-switch-default//g' \
+	-e 's/-O.//g' \
+	-e 's/-g//g' \
+	-e 's/-Wall//g'
+}
+
+
 if test "x$with_gallium_drivers" = x; then
     enable_gallium_llvm=no
 fi
@@ -1658,7 +1671,6 @@ if test "x$enable_gallium_llvm" = xyes; then
 
     if test "x$LLVM_CONFIG" != xno; then
 	LLVM_VERSION=`$LLVM_CONFIG --version | sed 's/svn.*//g'`
-	LLVM_CFLAGS=`$LLVM_CONFIG --cppflags|sed -e 's/-DNDEBUG\>//g' -e 's/-pedantic//g' -e 's/-Wcovered-switch-default//g' -e 's/-O.//g' -e 's/-g//g' -e 's/-Wall//g'`
 	if test "x$with_llvm_shared_libs" = xyes; then
 	    dnl We can't use $LLVM_VERSION because it has 'svn' stripped out,
 	    LLVM_LIBS="-lLLVM-`$LLVM_CONFIG --version`"
@@ -1675,8 +1687,9 @@ if test "x$enable_gallium_llvm" = xyes; then
 	fi
 	LLVM_LDFLAGS=`$LLVM_CONFIG --ldflags`
 	LLVM_BINDIR=`$LLVM_CONFIG --bindir`
-	LLVM_CXXFLAGS=`$LLVM_CONFIG --cxxflags|sed -e 's/-DNDEBUG\>//g' -e 's/-pedantic//g' -e 's/-Wcovered-switch-default//g' -e 's/-O.//g' -e 's/-g//g' -e 's/-Wall//g'`
-	LLVM_CPPFLAGS=`$LLVM_CONFIG --cppflags|sed -e 's/-DNDEBUG\>//g' -e 's/-pedantic//g' -e 's/-Wcovered-switch-default//g' -e 's/-O.//g' -e 's/-g//g' -e 's/-Wall//g'`
+	LLVM_CPPFLAGS=`strip_unwanted_llvm_flags "$LLVM_CONFIG --cppflags"`
+	LLVM_CFLAGS=$LLVM_CPPFLAGS   # CPPFLAGS seem to be sufficient
+	LLVM_CXXFLAGS=`strip_unwanted_llvm_flags "$LLVM_CONFIG --cxxflags"`
 	LLVM_INCLUDEDIR=`$LLVM_CONFIG --includedir`
 	LLVM_LIBDIR=`$LLVM_CONFIG --libdir`
 	DEFINES="${DEFINES} -DHAVE_LLVM=`echo $LLVM_VERSION | sed -e 's/\([[0-9]]\)\.\([[0-9]]\)/0x0\10\2/g'`"