Improve incremental builds with unmodified GOB headers.

[upkg.git] / Makefile.am

diff --git a/Makefile.am b/Makefile.am
index e5140a4679fddcccc4d4b2b9ddaa7e46a6aa2768..f454e3529c4eab8e54d5be0eee370b70cf9442ec 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -11,6 +11,9 @@ MOSTLYCLEANFILES =
 DISTCLEANFILES =
 CLEANFILES =
 
+# Distribution should be buildable without working gob.
+AM_DISTCHECK_CONFIGURE_FLAGS = GOB2=false
+
 EXTRA_DIST = $(MAINTAINERCLEANFILES) m4/gnulib-cache.m4
 
 AM_CPPFLAGS = -I$(top_builddir)/src -I$(top_srcdir)/src \
@@ -60,6 +63,7 @@ moduleflags = -module -avoid-version -export-symbols-regex _LTX_
 
 engine_GOBS = src/engine/palette.gob src/engine/texture.gob \
        src/engine/music.gob src/engine/sound.gob src/engine/mesh.gob
+EXTRA_DIST += $(engine_GOBS)
 
 MAINTAINERCLEANFILES += $(engine_GOBS:.gob=.gobstamp) \
        $(engine_GOBS:.gob=.c) $(engine_GOBS:.gob=.h)
@@ -113,7 +117,8 @@ if HAVE_GOB2_DYN
        $(GOB_V) od='$(@D)'; case $$od in \
          src/*) od=src ;; \
          */src/*) od=$${od%/src/*}/src ;; \
-         esac; $(GOB2) -o "$$od" --file-sep=/ --no-private-header $<
+         esac; $(GOB2) -o "$$od" --file-sep=/ \
+           --no-private-header --no-touch-headers $<
        $(AM_V_at) mv -f $@.tmp $@
 else
 if HAVE_GOB2
@@ -136,5 +141,24 @@ STAMP_RECOVER = \
 .gobstamp.c: ; $(STAMP_RECOVER)
 .gobstamp.h: ; $(STAMP_RECOVER)
 
+# The gob rules refrain from updating unchanged headers for the convenience of
+# developers, but the headers should be distributed with up-to-date timestamps.
+dist-hook: update-headers
+update-headers: unfuck-distdir
+       for f in $(engine_GOBS:.gob=.h); do \
+         touch -c '$(distdir)'/"$$f" || exit; \
+       done
+.PHONY: update-headers
+
+# When running "make dist" in a VPATH build with a read-only srcdir, Automake
+# will produce a distribution with all files read-only.  Moreover, the files
+# are read-only in distdir when the dist hooks are run.  This hook will
+# manually fix up the permissions.  All dist hooks that modify files in
+# distdir should list unfuck-distdir as a prerequisite.
+dist-hook: unfuck-distdir
+unfuck-distdir:
+       find '$(distdir)' -type f -exec chmod u+w {} +
+.PHONY: unfuck-distdir
+
 include $(top_srcdir)/lib/gnulib.mk
 include $(top_srcdir)/libltdl/ltdl.mk