Change in ...coreboot[master]: Makefile.inc: Avoid race condition when using 'make -j<N>'

[Jonathan Neuschäfer (Code Review)]

Jonathan Neuschäfer has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/29984

Change subject: Makefile.inc: Avoid race condition when using 'make -j<N>'
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Makefile.inc: Avoid race condition when using 'make -j<N>'

When building coreboot from scratch with 'make -j4', I sometimes see
this error:

CREATE     build/mainboard/emulation/qemu-riscv/cbfs-file.wblRgZ.out (from /.../coreboot/.config)
    HOSTCC     cbfstool/cbfstool (link)
make[1]: execvp: build/util/kconfig/conf: Permission denied
make[1]: *** [/.../coreboot/util/kconfig/Makefile:92: savedefconfig] Error 127

It happens, I think, because the rule generated by
cbfs-files-processor-defconfig runs 'make savedefconfig', which builds
build/util/kconfig/conf, and something also builds it, at the same time.
Fix this case, by making this rule depend on $(objutil)/kconfig/conf.

Change-Id: Ie93eda567f88ca08c97df7e70cdff5b07442747d
Signed-off-by: Jonathan Neuschäfer 
---
M Makefile.inc
1 file changed, 1 insertion(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/84/29984/1

diff --git a/Makefile.inc b/Makefile.inc
index aaae7bc..6a702a2 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -287,7 +287,7 @@
 # arg1: input
 # arg2: output
 cbfs-files-processor-defconfig= \
-	$(eval $(2): $(1) $(obj)/build.h; \
+	$(eval $(2): $(1) $(obj)/build.h $(objutil)/kconfig/conf; \
    	+printf "    CREATE     $(2) (from $(1))\n"; \
    	printf "# This image was built using coreboot " > $(2).tmp && \
    	grep "<COREBOOT_VERSION>" $(obj)/build.h |cut -d" -f2 >> $(2).tmp && \