diff options
authorMasahiro Yamada <>2021-02-28 15:10:28 +0900
committerMasahiro Yamada <>2021-04-25 05:09:57 +0900
commit805b2e1d427aab4bb27fa7c51ebb9db7547551b1 (patch)
parent57fd251c789647552d32d2fc51bedd4f90d70f9f (diff)
kbuild: include Makefile.compiler only when compiler is needed
Since commit f2f02ebd8f38 ("kbuild: improve cc-option to clean up all temporary files"), running 'make kernelversion' in a read-only source tree emits a bunch of warnings: mkdir: cannot create directory '.tmp_12345': Permission denied No-build targets such as kernelversion, clean, help, etc. do not need to evaluate $(call cc-option,) or friends. Skip Makefile.compiler so $(call cc-option,) becomes no-op. This not only fixes the warnings, but also runs non-build targets much faster. Basically, all installation targets should also be non-build targets. Unfortunately, vdso_install requires the compiler because it builds vdso before installation. This is a problem that must be fixed by a separate patch. Reported-by: Israel Tsadok <> Signed-off-by: Masahiro Yamada <>
1 files changed, 13 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 80bae8a1341f..d79823428cd7 100644
--- a/Makefile
+++ b/Makefile
@@ -264,6 +264,10 @@ no-dot-config-targets := $(clean-targets) \
$(version_h) headers headers_% archheaders archscripts \
%asm-generic kernelversion %src-pkg dt_binding_check \
+# Installation targets should not require compiler. Unfortunately, vdso_install
+# is an exception where build artifacts may be updated. This must be fixed.
+no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
+ headers_install modules_install kernelrelease image_name
no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
single-targets := %.a %.i %.ko %.ll %.lst %.mod %.o %.s %.symtypes %/
@@ -271,6 +275,7 @@ single-targets := %.a %.i %.ko %.ll %.lst %.mod %.o %.s %.symtypes %/
config-build :=
mixed-build :=
need-config := 1
+need-compiler := 1
may-sync-config := 1
single-build :=
@@ -280,6 +285,12 @@ ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
+ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
+ ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
+ need-compiler :=
+ endif
ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
may-sync-config :=
@@ -586,7 +597,9 @@ endif
# Include this also for config targets because some architectures need
# cc-cross-prefix to determine CROSS_COMPILE.
+ifdef need-compiler
include $(srctree)/scripts/Makefile.compiler
ifdef config-build
# ===========================================================================