From 35c3cbe0abf3b9e12567376ecb0948806bd8188a Mon Sep 17 00:00:00 2001
From: Ken Sedgwick <ken@bonsai.com>
Date: Thu, 15 Aug 2024 23:53:10 -0700
Subject: [PATCH] Improve commit_hash.h dependencies and generation

The previous setup was not regenerating commit_hash.h correctly when
the dev tree was modified by git operations.
---
 Makefile.am | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index 750638325..865f7eac9 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -673,9 +673,21 @@ create-tarball: create-tarball.in Makefile
 	chmod +x create-tarball
 
 BUILT_SOURCES = commit_hash.h
-CLEANFILES += commit_hash.h
 
-commit_hash.h:
-	./generate_commit_hash.sh
+commit_hash.h: FORCE
+	@if test -e $(srcdir)/.git/logs/HEAD; then \
+		if [ ! -f $@ ] || [ $(srcdir)/.git/logs/HEAD -nt $@ ]; then \
+			echo "Regenerating commit_hash.h..."; \
+			$(SHELL) $(srcdir)/generate_commit_hash.sh; \
+		else \
+			echo "commit_hash.h is up-to-date."; \
+		fi \
+	else \
+		echo "Using existing commit_hash.h"; \
+	fi
+
+FORCE:
+
+.PHONY: FORCE
 
 clboss libclboss.la: $(BUILT_SOURCES)