Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
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-3
+1
-1
Makefile
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-1
Makefile
···
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include $(srctree)/scripts/Kbuild.include
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# Read KERNELRELEASE from include/config/kernel.release (if it exists)
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-
KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
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KERNELRELEASE = $(call read-file, include/config/kernel.release)
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KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
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export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
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+14
scripts/Kbuild.include
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scripts/Kbuild.include
···
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space := $(empty) $(empty)
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space_escape := _-_SPACE_-_
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pound := \#
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define newline
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endef
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###
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# Comparison macros.
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# The path to Kbuild or Makefile. Kbuild has precedence over Makefile.
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kbuild-dir = $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
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kbuild-file = $(or $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Makefile)
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###
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# Read a file, replacing newlines with spaces
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#
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# Make 4.2 or later can read a file by using its builtin function.
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ifneq ($(filter-out 3.% 4.0 4.1, $(MAKE_VERSION)),)
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read-file = $(subst $(newline),$(space),$(file < $1))
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else
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read-file = $(shell cat $1 2>/dev/null)
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endif
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###
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# Easy method for doing a status message
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scripts/Makefile.modfinal
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scripts/Makefile.modfinal