All built targets need fixdep to be built first, before handling object
dependencies [1]. We're missing one such dependency before the libsubcmd
target.
This resolves .cmd file generation issues such that the following
sequence produces many fewer results:
$ git clean -xfd tools/
$ make tools/objtool
$ grep "cannot find fixdep" $(find tools/objtool -name '*.cmd')
In particular, only a buggy tools/objtool/libsubcmd/.fixdep.o.cmd
remains, due to circular dependencies of fixdep on itself.
Such incomplete .cmd files don't usually cause a direct problem, since
they're designed to fail "open", but they can cause some subtle problems
that would otherwise be handled by proper fixdep'd dependency files.
[1] This problem is better described in commit abb26210a395 ("perf
tools: Force fixdep compilation at the start of the build"). I don't
apply its solution here, because additional recursive make can be a bit
of overkill.
Link: https://lore.kernel.org/all/ZGVi9HbI43R5trN8@bhelgaas/
Link: https://lore.kernel.org/all/Zk-C5Eg84yt6_nml@xxxxxxxxxx/
Signed-off-by: Brian Norris <briannorris@xxxxxxxxxxxx>
---
tools/lib/subcmd/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/lib/subcmd/Makefile b/tools/lib/subcmd/Makefile
index b87213263a5e..59b09f280e49 100644
--- a/tools/lib/subcmd/Makefile
+++ b/tools/lib/subcmd/Makefile
@@ -76,7 +76,7 @@ include $(srctree)/tools/build/Makefile.include
all: fixdep $(LIBFILE)
-$(SUBCMD_IN): FORCE
+$(SUBCMD_IN): fixdep FORCE
@$(MAKE) $(build)=libsubcmd
$(LIBFILE): $(SUBCMD_IN)
--
2.45.2.803.g4e1b14247a-goog
