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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 /Makefile | |
| 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 'Makefile')
| -rw-r--r-- | Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
@@ -376,7 +376,7 @@ else # !mixed-build include $(srctree)/scripts/Kbuild.include # Read KERNELRELEASE from include/config/kernel.release (if it exists) -KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) +KERNELRELEASE = $(call read-file, include/config/kernel.release) KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION |