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kbuild: parse C= and M= before changing the working directory
If Kbuild recurses to the top Makefile (for example, 'make deb-pkg'), C= and M= are parsed over again, needlessly. Parse them before changing the working directory. After that, sub_make_done is set to 1, so they are parsed just once. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
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61
Makefile
61
Makefile
@ -100,6 +100,36 @@ endif
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export quiet Q KBUILD_VERBOSE
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# Call a source code checker (by default, "sparse") as part of the
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# C compilation.
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#
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# Use 'make C=1' to enable checking of only re-compiled files.
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# Use 'make C=2' to enable checking of *all* source files, regardless
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# of whether they are re-compiled or not.
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#
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# See the file "Documentation/dev-tools/sparse.rst" for more details,
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# including where to get the "sparse" utility.
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ifeq ("$(origin C)", "command line")
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KBUILD_CHECKSRC = $(C)
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endif
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ifndef KBUILD_CHECKSRC
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KBUILD_CHECKSRC = 0
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endif
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export KBUILD_CHECKSRC
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# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
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# directory of external module to build. Setting M= takes precedence.
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ifeq ("$(origin M)", "command line")
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KBUILD_EXTMOD := $(M)
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endif
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$(if $(word 2, $(KBUILD_EXTMOD)), \
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$(error building multiple external modules is not supported))
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export KBUILD_EXTMOD
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# Kbuild will save output files in the current working directory.
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# This does not need to match to the root of the kernel source tree.
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#
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@ -194,36 +224,6 @@ ifeq ($(need-sub-make),)
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# so that IDEs/editors are able to understand relative filenames.
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MAKEFLAGS += --no-print-directory
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# Call a source code checker (by default, "sparse") as part of the
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# C compilation.
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#
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# Use 'make C=1' to enable checking of only re-compiled files.
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# Use 'make C=2' to enable checking of *all* source files, regardless
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# of whether they are re-compiled or not.
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#
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# See the file "Documentation/dev-tools/sparse.rst" for more details,
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# including where to get the "sparse" utility.
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ifeq ("$(origin C)", "command line")
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KBUILD_CHECKSRC = $(C)
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endif
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ifndef KBUILD_CHECKSRC
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KBUILD_CHECKSRC = 0
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endif
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# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
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# directory of external module to build. Setting M= takes precedence.
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ifeq ("$(origin M)", "command line")
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KBUILD_EXTMOD := $(M)
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endif
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$(if $(word 2, $(KBUILD_EXTMOD)), \
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$(error building multiple external modules is not supported))
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export KBUILD_CHECKSRC KBUILD_EXTMOD
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extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
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ifeq ($(abs_srctree),$(abs_objtree))
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# building in the source tree
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srctree := .
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@ -1093,6 +1093,7 @@ endif # CONFIG_BPF
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PHONY += prepare0
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extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
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export MODORDER := $(extmod-prefix)modules.order
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export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
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