android: re-generate git_sha1.h if git HEAD updated (v2)

Generated header git_sha1.h has to depend on the git HEAD
otherwise it will never be updated.

v2: use absolute path for --git-dir option, in order to support cases
when Android.gen.mk is invoked by other makefiles

diff --git a/src/mesa/Android.gen.mk b/src/mesa/Android.gen.mk
index a985f0a..7c87d7d 100644 (file)
--- a/src/mesa/Android.gen.mk
+++ b/src/mesa/Android.gen.mk
@@ -69,12 +69,12 @@ define es-gen
        $(hide) $(PRIVATE_SCRIPT) $(1) $(PRIVATE_XML) > $@
 endef
 
-$(intermediates)/main/git_sha1.h:
+$(intermediates)/main/git_sha1.h: $(MESA_TOP)/.git/HEAD
        @mkdir -p $(dir $@)
        @echo "GIT-SHA1: $(PRIVATE_MODULE) <= git"
        $(hide) touch $@
        $(hide) if which git > /dev/null; then \
-                       git --git-dir $(PRIVATE_PATH)/../../.git log -n 1 --oneline | \
+                       git --git-dir $(MESA_TOP)/.git log -n 1 --oneline | \
                        sed 's/^\([^ ]*\) .*/#define MESA_GIT_SHA1 "git-\1"/' \
                        > $@; \
                fi