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| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2019-03-26 13:02:19 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-04 09:21:20 +0200 |
| commit | c6d02b1ea4d7c58e3f631d4bc7b5287b3f72ca53 (patch) | |
| tree | fbebc16cef707b3b7c8cc9f2de7bf47dcca3d291 /Makefile | |
| parent | 479e1afd232e0bf502f2a92a21fd09c0ee6747ca (diff) | |
kbuild: skip parsing pre sub-make code for recursion
[ Upstream commit 221cc2d27ddc49b3e06d4637db02bf78e70c573c ]
When Make recurses to the top Makefile with sub-make-done unset,
the code block surrounded by 'ifneq ($(sub-make-done),1) ... endif'
is parsed multiple times. This happens for in-tree building of
include/config/auto.conf, *-pkg, etc. with GNU Make 4.x.
This is a slight regression by commit 688931a5ad4e ("kbuild: skip
sub-make for in-tree build with GNU Make 4.x") in terms of performance
since that code block contains one $(shell ...) invocation.
Fix it by exporting the variable irrespective of sub-make being run.
I renamed it because GNU Make cannot properly export variables
containing hyphens. This is probably a bug of GNU Make, and the issue
in Kbuild had already been reported by commit 2bfbe7881ee0 ("kbuild:
Do not use hyphen in exported variable name").
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Sasha Levin (Microsoft) <sashal@kernel.org>
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 8 |
1 files changed, 5 insertions, 3 deletions
@@ -31,7 +31,7 @@ _all: # descending is started. They are now explicitly listed as the # prepare rule. -ifneq ($(sub-make-done),1) +ifneq ($(sub_make_done),1) # Do not use make's built-in rules and variables # (this increases performance and avoids hard-to-debug behaviour) @@ -159,6 +159,8 @@ need-sub-make := 1 $(lastword $(MAKEFILE_LIST)): ; endif +export sub_make_done := 1 + ifeq ($(need-sub-make),1) PHONY += $(MAKECMDGOALS) sub-make @@ -168,12 +170,12 @@ $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make # Invoke a second make in the output directory, passing relevant variables sub-make: - $(Q)$(MAKE) sub-make-done=1 \ + $(Q)$(MAKE) \ $(if $(KBUILD_OUTPUT),-C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR)) \ -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) endif # need-sub-make -endif # sub-make-done +endif # sub_make_done # We process the rest of the Makefile if this is the final invocation of make ifeq ($(need-sub-make),) |