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| author | Masahiro Yamada <masahiroy@kernel.org> | 2022-12-11 11:54:47 +0900 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2022-12-13 22:29:10 +0900 |
| commit | 6768fa4bcb6c1618248f135d04b9287ba2724ae0 (patch) | |
| tree | 0d49fcbba647b32e81d9da19192092dce67485e4 /scripts | |
| parent | a5db80c65dbf9144de155f8a0f08becc9c307db0 (diff) | |
| download | lwn-6768fa4bcb6c1618248f135d04b9287ba2724ae0.tar.gz lwn-6768fa4bcb6c1618248f135d04b9287ba2724ae0.zip | |
kbuild: add read-file macro
Since GNU Make 4.2, $(file ...) supports the read operater '<', which
is useful to read a file without forking a new process. No warning is
shown even if the input file is missing.
For older Make versions, it falls back to the cat command.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Reviewed-by: Alexander Lobakin <alexandr.lobakin@intel.com>
Tested-by: Alexander Lobakin <alexandr.lobakin@intel.com>
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/Kbuild.include | 14 | ||||
| -rw-r--r-- | scripts/Makefile.modfinal | 2 | ||||
| -rw-r--r-- | scripts/Makefile.modinst | 2 |
3 files changed, 16 insertions, 2 deletions
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include index 3be7c2d75667..21e76ba0de17 100644 --- a/scripts/Kbuild.include +++ b/scripts/Kbuild.include @@ -10,6 +10,10 @@ empty := space := $(empty) $(empty) space_escape := _-_SPACE_-_ pound := \# +define newline + + +endef ### # Comparison macros. @@ -62,6 +66,16 @@ kbuild-dir = $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) kbuild-file = $(or $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Makefile) ### +# Read a file, replacing newlines with spaces +# +# Make 4.2 or later can read a file by using its builtin function. +ifneq ($(filter-out 3.% 4.0 4.1, $(MAKE_VERSION)),) +read-file = $(subst $(newline),$(space),$(file < $1)) +else +read-file = $(shell cat $1 2>/dev/null) +endif + +### # Easy method for doing a status message kecho := : quiet_kecho := echo diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal index 4705d32388f3..83f2797e530c 100644 --- a/scripts/Makefile.modfinal +++ b/scripts/Makefile.modfinal @@ -13,7 +13,7 @@ include $(srctree)/scripts/Kbuild.include include $(srctree)/scripts/Makefile.lib # find all modules listed in modules.order -modules := $(shell cat $(MODORDER)) +modules := $(call read-file, $(MODORDER)) __modfinal: $(modules) @: diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst index f4cff42069ad..65aac6be78ec 100644 --- a/scripts/Makefile.modinst +++ b/scripts/Makefile.modinst @@ -9,7 +9,7 @@ __modinst: include include/config/auto.conf include $(srctree)/scripts/Kbuild.include -modules := $(shell cat $(MODORDER)) +modules := $(call read-file, $(MODORDER)) ifeq ($(KBUILD_EXTMOD),) dst := $(MODLIB)/kernel |