version --build-options: report commit, too, if possible

diff --git a/Makefile b/Makefile
index 5587bccc932fdae37831dedba29680fb13b6ae29..2ce70d205d9284ee2f0454ad66dcca73f90e1dc8 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1902,7 +1902,9 @@ builtin/help.sp builtin/help.s builtin/help.o: EXTRA_CPPFLAGS = \
 version.sp version.s version.o: GIT-VERSION-FILE GIT-USER-AGENT
 version.sp version.s version.o: EXTRA_CPPFLAGS = \
        '-DGIT_VERSION="$(GIT_VERSION)"' \
-       '-DGIT_USER_AGENT=$(GIT_USER_AGENT_CQ_SQ)'
+       '-DGIT_USER_AGENT=$(GIT_USER_AGENT_CQ_SQ)' \
+       '-DGIT_BUILT_FROM_COMMIT="$(shell GIT_CEILING_DIRECTORIES=\"$(CURDIR)/..\" \
+               git rev-parse -q --verify HEAD || :)"'
 
 $(BUILT_INS): git$X
        $(QUIET_BUILT_IN)$(RM) $@ && \