File motif-avoid-empty-include.diff of Package motif.27027

From: Jan Engelhardt <jengelh@inai.de>
Date: 2013-01-04 18:49:50.951406965 +0100

build: avoid using -I/-L with no parameter.

It can happen that some of these variables are empty, leading to
the compiler always returning an exit code, and thus configure
missing the existence of libraries. I saw this in config.log:

configure:15405: checking X11/extensions/Xrender.h usability
configure:15405: gcc -c -fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -fno-strict-aliasing -Wall -g -fno-strict-aliasing -Wno-unused -Wno-comment -fno-tree-ter  -I conftest.c >&5
gcc: fatal error: no input files
compilation terminated.
configure:15405: $? = 1

---
 ac_find_xft.m4 |   32 ++++++++++++++++++++++++++------
 1 file changed, 26 insertions(+), 6 deletions(-)

Index: motif-2.3.4/ac_find_xft.m4
===================================================================
--- motif-2.3.4.orig/ac_find_xft.m4
+++ motif-2.3.4/ac_find_xft.m4
@@ -48,7 +48,10 @@ yes)
 	esac
 	;;
 *)
-	FREETYPE_CFLAGS="-I$freetype_includes"
+	FREETYPE_CFLAGS=""
+	if test -n "$freetype_includes"; then
+		FREETYPE_CFLAGS="-I$freetype_includes"
+	fi
 	;;
 esac
 
@@ -67,7 +70,11 @@ yes)
 	esac
 	;;
 *)
-	freetype_lib="-L$freetype_lib -lfreetype"
+	freetype_lib=""
+	if test -n "$freetype_lib"; then
+		freetype_lib="-L$freetype_lib"
+	fi
+	freetype_lib="$freetype_lib -lfreetype"
 	;;
 esac
 
@@ -134,8 +141,14 @@ AC_SUBST(CONFDIR)
 FINDXFT_HAVE_XRENDER="no"
 case "$have_x" in
 yes)
-	XRENDER_CFLAGS="-I$x_includes"
-	XRENDER_LIBS="-L$x_libraries -lXft -lXrender"
+	if test -n "$x_includes"; then
+		XRENDER_CFLAGS="-I$x_includes"
+	fi
+	XRENDER_LIBS=""
+	if test -n "$x_libraries"; then
+		XRENDER_LIBS="-L$x_libraries"
+	fi
+	XRENDER_LIBS="$XRENDER_LIBS -lXft -lXrender"
 
 	saved_LIBS="$LIBS"
 	LIBS="$LIBS $XRENDER_LIBS"
@@ -197,7 +210,10 @@ yes)
 	esac
 	;;
 *)
-	FONTCONFIG_CFLAGS="-I$fontconfig_includes"
+	FONTCONFIG_CFLAGS=""
+	if test -n "$fontconfig_includes"; then
+		FONTCONFIG_CFLAGS="-I$fontconfig_includes"
+	fi
 	;;
 esac
 
@@ -216,7 +232,11 @@ yes)
 	esac
 	;;
 *)
-	FONTCONFIG_LIBS="-L$fontconfig_lib -lfontconfig"
+	FONTCONFIG_LIBS=""
+	if test -n "$fontconfig_lib"; then
+		FONTCONFIG_LIBS="-L$fontconfig_lib";
+	fi
+	FONTCONFIG_LIBS="$FONTCONFIG_LIBS -lfontconfig"
 	;;
 esac