mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-15 15:04:27 +08:00
2fedf79b69
We've been hit several times by a Makefile bug where line indented by tab was falsely considered as target command. We prevent this by always using space indentation for everything except for the target commands. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1480884178-8072-3-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
101 lines
4.0 KiB
Plaintext
101 lines
4.0 KiB
Plaintext
###
|
|
# build: Generic definitions
|
|
#
|
|
# Lots of this code have been borrowed or heavily inspired from parts
|
|
# of kbuild code, which is not credited, but mostly developed by:
|
|
#
|
|
# Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
|
|
# Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
|
|
#
|
|
|
|
###
|
|
# Convenient variables
|
|
comma := ,
|
|
squote := '
|
|
|
|
###
|
|
# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
|
|
dot-target = $(dir $@).$(notdir $@)
|
|
|
|
###
|
|
# filename of target with directory and extension stripped
|
|
basetarget = $(basename $(notdir $@))
|
|
|
|
###
|
|
# The temporary file to save gcc -MD generated dependencies must not
|
|
# contain a comma
|
|
depfile = $(subst $(comma),_,$(dot-target).d)
|
|
|
|
###
|
|
# Check if both arguments has same arguments. Result is empty string if equal.
|
|
arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
|
|
$(filter-out $(cmd_$@), $(cmd_$(1))) )
|
|
|
|
###
|
|
# Escape single quote for use in echo statements
|
|
escsq = $(subst $(squote),'\$(squote)',$1)
|
|
|
|
# Echo command
|
|
# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
|
|
echo-cmd = $(if $($(quiet)cmd_$(1)),\
|
|
echo ' $(call escsq,$($(quiet)cmd_$(1)))';)
|
|
|
|
###
|
|
# Replace >$< with >$$< to preserve $ when reloading the .cmd file
|
|
# (needed for make)
|
|
# Replace >#< with >\#< to avoid starting a comment in the .cmd file
|
|
# (needed for make)
|
|
# Replace >'< with >'\''< to be able to enclose the whole string in '...'
|
|
# (needed for the shell)
|
|
make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
|
|
|
|
###
|
|
# Find any prerequisites that is newer than target or that does not exist.
|
|
# PHONY targets skipped in both cases.
|
|
any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
|
|
|
|
###
|
|
# Copy dependency data into .cmd file
|
|
# - gcc -M dependency info
|
|
# - command line to create object 'cmd_object :='
|
|
dep-cmd = $(if $(wildcard $(fixdep)), \
|
|
$(fixdep) $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp; \
|
|
rm -f $(depfile); \
|
|
mv -f $(dot-target).tmp $(dot-target).cmd, \
|
|
printf '\# cannot find fixdep (%s)\n' $(fixdep) > $(dot-target).cmd; \
|
|
printf '\# using basic dep data\n\n' >> $(dot-target).cmd; \
|
|
cat $(depfile) >> $(dot-target).cmd; \
|
|
printf '\n%s\n' 'cmd_$@ := $(make-cmd)' >> $(dot-target).cmd)
|
|
|
|
###
|
|
# if_changed_dep - execute command if any prerequisite is newer than
|
|
# target, or command line has changed and update
|
|
# dependencies in the cmd file
|
|
if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)), \
|
|
@set -e; \
|
|
$(echo-cmd) $(cmd_$(1)) && $(dep-cmd))
|
|
|
|
# if_changed - execute command if any prerequisite is newer than
|
|
# target, or command line has changed
|
|
if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
|
|
@set -e; \
|
|
$(echo-cmd) $(cmd_$(1)); \
|
|
printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
|
|
|
|
###
|
|
# C flags to be used in rule definitions, includes:
|
|
# - depfile generation
|
|
# - global $(CFLAGS)
|
|
# - per target C flags
|
|
# - per object C flags
|
|
# - BUILD_STR macro to allow '-D"$(variable)"' constructs
|
|
c_flags_1 = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj))
|
|
c_flags_2 = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(c_flags_1))
|
|
c_flags = $(filter-out $(CFLAGS_REMOVE_$(obj)), $(c_flags_2))
|
|
cxx_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CXXFLAGS) -D"BUILD_STR(s)=\#s" $(CXXFLAGS_$(basetarget).o) $(CXXFLAGS_$(obj))
|
|
|
|
###
|
|
## HOSTCC C flags
|
|
|
|
host_c_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CHOSTFLAGS) -D"BUILD_STR(s)=\#s" $(CHOSTFLAGS_$(basetarget).o) $(CHOSTFLAGS_$(obj))
|