Don't compile bitmap source files for disabled formats

pcfread.c is a special case - it's needed for either reading pcf files
from disk (--enable-pcfformat) or from the builtin fonts in memory
(--enable-builtins), so needed a new AM_CONDITIONAL case.

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Rémi Cardona <remi@gentoo.org>

configure.ac

@@ -153,6 +153,9 @@ if test "x$XFONT_PCFFORMAT" = xyes; then
 	XFONT_BITMAP=yes
 fi
 
+AM_CONDITIONAL(XFONT_PCF_OR_BUILTIN,
+	[test "x$XFONT_PCFFORMAT" = xyes -o "x$XFONT_BUILTINS" = xyes])
+
 AC_ARG_ENABLE(bdfformat,
 	AS_HELP_STRING([--disable-bdfformat],
 		[Support BDF format bitmap fonts (default: enabled)]),

src/bitmap/Makefile.am

@@ -6,14 +6,24 @@ AM_CFLAGS = $(XFONT_CFLAGS) $(OS_CFLAGS) $(CWARNFLAGS)
 noinst_LTLIBRARIES = libbitmap.la
 
 libbitmap_la_SOURCES = 		\
-	bdfread.c		\
-	bdfutils.c		\
 	bitmap.c		\
 	bitmapfunc.c		\
 	bitmaputil.c		\
 	bitscale.c		\
-	fontink.c		\
-	pcfread.c		\
-	pcfwrite.c		\
-	snfread.c		\
-	snfstr.h
+	fontink.c
+
+if XFONT_BDFFORMAT
+libbitmap_la_SOURCES += bdfread.c bdfutils.c
+endif
+
+if XFONT_PCF_OR_BUILTIN
+libbitmap_la_SOURCES += pcfread.c
+endif
+
+if XFONT_PCFFORMAT
+libbitmap_la_SOURCES += pcfwrite.c
+endif
+
+if XFONT_SNFFORMAT
+libbitmap_la_SOURCES += snfread.c snfstr.h
+endif