gh-149353: Avoid stale JIT stamp triggering rebuilds

diegorusso · diegorusso · commit 3883cef8cc49 · 2026-05-04T23:53:36.000+01:00
diff --git a/Makefile.pre.in b/Makefile.pre.in
@@ -3226,7 +3226,9 @@ $(JIT_GENERATED_STAMP): $(JIT_DEPS)
 	@REGEN_JIT_COMMAND@
 	@touch $@
 
-$(JIT_BUILD_TARGETS): $(JIT_GENERATED_STAMP)
+# The stamp regenerates all JIT outputs as a group. Keep it order-only so its
+# newer timestamp does not make each generated artifact look stale.
+$(JIT_BUILD_TARGETS): | $(JIT_GENERATED_STAMP)
 	@if test ! -f "$@"; then \
 		rm -f $(JIT_GENERATED_STAMP); \
 		$(MAKE) $(JIT_GENERATED_STAMP); \
diff --git a/Misc/NEWS.d/next/Build/2026-05-04-23-07-45.gh-issue-149353.XfM8aQ.rst b/Misc/NEWS.d/next/Build/2026-05-04-23-07-45.gh-issue-149353.XfM8aQ.rst
@@ -0,0 +1,2 @@
+Avoid unnecessary JIT-related rebuilds during ``make install`` after
+``--enable-optimizations`` builds.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Avoid unnecessary JIT-related rebuilds during ``make install`` after
	`2`	+``--enable-optimizations`` builds.