[configure.in] Create backend .pc files using CAIRO_CONFIG_COMMANDS

configure.in

@@ -219,7 +219,6 @@ AC_DEFUN([CAIRO_CONFIG_COMMANDS], [
 		_tmp_file=$1.tmp
 		AC_MSG_NOTICE([creating $_config_file])
 		{
-			echo "/* Generated by configure.  Do not edit */"
 			$2
 		} >> "$_tmp_file"
 		if cmp -s "$_tmp_file" "$_config_file"; then
@@ -330,10 +329,8 @@ AC_DEFUN([CAIRO_BACKEND_ENABLE],
 	      CAIRO_LIBS="$$1_NONPKGCONFIG_LIBS$$1_LIBS$CAIRO_LIBS"
 	      CAIRO_NONPKGCONFIG_CFLAGS="$$1_NONPKGCONFIG_CFLAGS$CAIRO_NONPKGCONFIG_CFLAGS"
 	      CAIRO_NONPKGCONFIG_LIBS="$$1_NONPKGCONFIG_LIBS$CAIRO_NONPKGCONFIG_LIBS"
-	      outfile=`echo src/cairo-$1.pc | sed -e s/_/-/g`
-	      AC_MSG_NOTICE([creating $outfile])
-	      mkdir -p src
-	      AS_IF([sed \
+	      CAIRO_CONFIG_COMMANDS(m4_bpatsubst(src/cairo-$1.pc,_,-),
+		      [sed \
 			-e "s,@backend_name@,$1,g" \
 			-e "s,@Backend_Name@,$2,g" \
 			-e "s,@BACKEND_BASE@,$$1_BASE,g" \
@@ -345,10 +342,19 @@ AC_DEFUN([CAIRO_BACKEND_ENABLE],
 			-e "s,@libdir@,$libdir,g" \
 			-e "s,@includedir@,$includedir,g" \
 			-e "s,@VERSION@,$VERSION,g" \
-	               $srcdir/src/cairo-backend.pc.in > $outfile],,[
-		rm -f "$outfile"
-		AC_MSG_ERROR([failed creating $outfile])
-	      ])
+	                $srcdir/src/cairo-backend.pc.in
+		      ],
+		      [
+		       $1_BASE='$$1_BASE'
+		       $1_REQUIRES='$$1_REQUIRES'
+		       $1_NONPKGCONFIG_LIBS='$$1_NONPKGCONFIG_LIBS'
+		       $1_NONPKGCONFIG_CFLAGS='$$1_NONPKGCONFIG_CFLAGS'
+		       prefix='$prefix'
+		       exec_prefix='$exec_prefix'
+		       libdir='$libdir'
+		       includedir='$includedir'
+		       VERSION='$VERSION'
+		      ])
 	    else
 	      CAIRO_NO_FEATURES="$4 $CAIRO_NO_FEATURES"
 	    fi
@@ -1043,6 +1049,7 @@ dnl ===========================================================================
 
 CAIRO_CONFIG_COMMANDS([src/cairo-features.h],
 [
+	echo '/* Generated by configure.  Do not edit. */'
 	echo '#ifndef CAIRO_FEATURES_H'
 	echo '#define CAIRO_FEATURES_H'
 	echo ''
@@ -1061,6 +1068,7 @@ CAIRO_CONFIG_COMMANDS([src/cairo-features.h],
 ])
 CAIRO_CONFIG_COMMANDS([src/cairo-no-features.h],
 [
+	echo '/* Generated by configure.  Do not edit. */'
 	echo '#ifndef CAIRO_NO_FEATURES_H'
 	echo '#define CAIRO_NO_FEATURES_H'
 	echo ''