[PATCH v4 11/11] kbuild: remove auto.conf from prerequisite of phony targets

Masahiro Yamada
2018-07-20T07:48:42Z

The top-level Makefile adds include/config/auto.conf as
prerequisites of 'scripts', 'prepare1', etc.

They were needed to terminate the build when include/config/auto.conf
is missing.

Now that the inclusion of include/config/auto.conf is mandatory
in the top-level Makefile if dot-config is 1 (Note 'include' directive
is used instead of '-include').

Make terminates the build by itself if it fails to create or update
include/config/auto.conf so we are sure that include/config/auto.conf
exists in the very first stage of make.

I am still keeping include/config/auto.conf as the prerequisite of
%/modules.builtin because modules.builtin is a real file. According
to commit a6c366324cac ("kbuild: Do not unnecessarily regenerate
modules.builtin"), it is intentional to compare time-stamps between
%/modules.builtin and include/config/auto.conf . I moved tristate.conf
here because it is only included from scripts/Makefile.modbuiltin.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

Changes in v4: None

Makefile | 14 ++++----------
1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/Makefile b/Makefile
index 0ec1c27..ceb9c1e 100644
--- a/Makefile
+++ b/Makefile
@@ -650,10 +650,6 @@ include/config/auto.conf:
/bin/false)

endif # may-sync-config
-
-else
-# Dummy target needed, because used as prerequisite
-include/config/auto.conf: ;
endif # $(dot-config)

KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
@@ -1048,15 +1044,14 @@ define filechk_kernel.release
endef

# Store (new) KERNELRELEASE string in include/config/kernel.release
-include/config/kernel.release: include/config/auto.conf FORCE
+include/config/kernel.release: $(srctree)/Makefile FORCE
$(call filechk,kernel.release)

# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
-scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
- asm-generic gcc-plugins $(autoksyms_h)
+scripts: scripts_basic asm-generic gcc-plugins $(autoksyms_h)
$(Q)$(MAKE) $(build)=$(@)

# Things we need to do before we recursively start building the kernel
@@ -1086,8 +1081,7 @@ endif
# that need to depend on updated CONFIG_* values can be checked here.
prepare2: prepare3 outputmakefile asm-generic

-prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
- include/config/auto.conf
+prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
$(cmd_crmodverdir)

archprepare: archheaders archscripts prepare1 scripts_basic
@@ -1225,7 +1219,7 @@ modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin

-%/modules.builtin: include/config/auto.conf
+%/modules.builtin: include/config/auto.conf include/config/tristate.conf
$(Q)$(MAKE) $(modbuiltin)=$*

--
2.7.4