WRaster: Fix incorrect use of macro USE_XSHM in installed header

The header "wraster.h" needs different behaviour depending on whether the
support for X Shared Memory extension was enabled or not; but the related
macro USE_XSHM is defined by WindowMaker's configure. After this header
have been installed, the macro is no more useable.

This patch makes the "wraster.h" a generated file, so it will be different
depending on USE_XSHM, but will not make use of the macro itself.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>

wrlib/Makefile.am

@@ -11,13 +11,17 @@ lib_LTLIBRARIES = libwraster.la
 
 libwraster_la_LDFLAGS = -version-info @WRASTER_VERSION@
 
+CLEANFILES = wraster.h
+EXTRA_DIST += wraster.h.in
+
 if HAVE_LD_VERSION_SCRIPT
 libwraster_la_LDFLAGS += -Wl,--version-script=libwraster.map
 EXTRA_libwraster_la_DEPENDENCIES = libwraster.map
-CLEANFILES = libwraster.map
+CLEANFILES += libwraster.map
 endif
 
-include_HEADERS = wraster.h
+BUILT_SOURCES = wraster.h
+nodist_include_HEADERS = wraster.h
 
 libwraster_la_SOURCES = 	\
 	imgformat.h 	\
@@ -94,9 +98,15 @@ wrlib.pc: Makefile
 	@echo 'Libs.private: $(GFXLIBS) $(MAGICKLIBS) $(XLIBS) -lm' >> $@
 	@echo 'Cflags: $(inc_search_path)' >> $@
 
+wraster.h: wraster.h.in $(top_builddir)/config.h
+	$(AM_V_GEN)$(top_srcdir)/script/replace-ac-keywords.sh \
+		--header "$(top_builddir)/config.h" \
+		--filter "USE_XSHM" \
+		-o $@  $<
+
 
 if HAVE_LD_VERSION_SCRIPT
-libwraster.map: $(include_HEADERS) $(top_srcdir)/script/generate-mapfile-from-header.sh
+libwraster.map: $(nodist_include_HEADERS) $(top_srcdir)/script/generate-mapfile-from-header.sh
 	$(AM_V_GEN)$(top_srcdir)/script/generate-mapfile-from-header.sh \
-		-n LIBWRASTER -v $(WRASTER_VERSION) $(srcdir)/$(include_HEADERS) > libwraster.map
+		-n LIBWRASTER -v $(WRASTER_VERSION) $<  >  $@
 endif

wrlib/wraster.h.in

@@ -46,10 +46,7 @@
 
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
-
-#ifdef USE_XSHM
-#include <X11/extensions/XShm.h>
-#endif
+@USE_XSHM@#include <X11/extensions/XShm.h>
 
 
 /*
@@ -261,11 +258,9 @@ typedef struct RImage {
 typedef struct RXImage {
     XImage *image;
 
-    /* Private data. Do not access */
-#ifdef USE_XSHM
-    XShmSegmentInfo info;
-    char is_shared;
-#endif
+@USE_XSHM@    /* Private data. Do not access */
+@USE_XSHM@    XShmSegmentInfo info;
+@USE_XSHM@    char is_shared;
 } RXImage;