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authorOleg Verych <olecom@flower.upol.cz>2007-02-06 02:18:21 +0100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-06 14:30:49 -0800
commit5de043f4bd11a9e0a3e8daec7d1905da575a76b7 (patch)
tree1cdafacd6a0f6e12bd5b88d9031a6130169ca868 /scripts/Kbuild.include
parentf6112ec27a8f0eee6c5a996f65c7bfd9457d9f85 (diff)
[PATCH] kbuild: improve option checking, Kbuild.include cleanup
GNU binutils, root users, tmpfiles, external modules ro builds must be fixed to do the right thing now. Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Horst Schirmeier <horst@schirmeier.com> Cc: Jan Beulich <jbeulich@novell.com> Cc: Daniel Drake <dsd@gentoo.org> Cc: Andi Kleen <ak@suse.de> Cc: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Oleg Verych <olecom@flower.upol.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts/Kbuild.include')
-rw-r--r--scripts/Kbuild.include96
1 files changed, 53 insertions, 43 deletions
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index f01f8c072852..96926eb13b0a 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -1,7 +1,7 @@
####
# kbuild: Generic definitions
-# Convinient variables
+# Convenient constants
comma := ,
squote := '
empty :=
@@ -56,40 +56,46 @@ endef
# gcc support functions
# See documentation in Documentation/kbuild/makefiles.txt
-# output directory for tests below
-TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
+# checker-shell
+# Usage: option = $(call checker-shell, $(CC)...-o $$OUT, option-ok, otherwise)
+# Exit code chooses option. $$OUT is safe location for needless output.
+define checker-shell
+ $(shell set -e; \
+ DIR=$(KBUILD_EXTMOD); \
+ cd $${DIR:-$(objtree)}; \
+ OUT=$$PWD/.$$$$.null; \
+ \
+ ln -s /dev/null $$OUT; \
+ if $(1) >/dev/null 2>&1; \
+ then echo "$(2)"; \
+ else echo "$(3)"; \
+ fi; \
+ rm -f $$OUT)
+endef
# as-option
# Usage: cflags-y += $(call as-option, -Wa$(comma)-isa=foo,)
-
-as-option = $(shell if $(CC) $(CFLAGS) $(1) -Wa,-Z -c -o /dev/null \
- -xassembler /dev/null > /dev/null 2>&1; then echo "$(1)"; \
- else echo "$(2)"; fi ;)
+as-option = $(call checker-shell, \
+ $(CC) $(CFLAGS) $(1) -c -xassembler /dev/null -o $$OUT, $(1), $(2))
# as-instr
# Usage: cflags-y += $(call as-instr, instr, option1, option2)
-
-as-instr = $(shell if echo -e "$(1)" | \
- $(CC) $(AFLAGS) -c -xassembler - \
- -o $(TMPOUT)astest$$$$.out > /dev/null 2>&1; \
- then rm $(TMPOUT)astest$$$$.out; echo "$(2)"; \
- else echo "$(3)"; fi)
+as-instr = $(call checker-shell, \
+ printf "$(1)" | $(CC) $(AFLAGS) -c -xassembler -o $$OUT -, $(2), $(3))
# cc-option
# Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586)
-
-cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
- > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
+cc-option = $(call checker-shell, \
+ $(CC) $(CFLAGS) $(if $(3),$(3),$(1)) -S -xc /dev/null -o $$OUT, $(1), $(2))
# cc-option-yn
# Usage: flag := $(call cc-option-yn, -march=winchip-c6)
-cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
- > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
+cc-option-yn = $(call cc-option, "y", "n", $(1))
# cc-option-align
# Prefix align with either -falign or -malign
cc-option-align = $(subst -functions=0,,\
- $(call cc-option,-falign-functions=0,-malign-functions=0))
+ $(call cc-option,-falign-functions=0,-malign-functions=0))
# cc-version
# Usage gcc-ver := $(call cc-version, $(CC))
@@ -97,35 +103,42 @@ cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
# cc-ifversion
# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
-cc-ifversion = $(shell if [ $(call cc-version, $(CC)) $(1) $(2) ]; then \
- echo $(3); fi;)
+cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
# ld-option
# Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both)
-ld-option = $(shell if $(CC) $(1) -nostdlib -xc /dev/null \
- -o $(TMPOUT)ldtest$$$$.out > /dev/null 2>&1; \
- then rm $(TMPOUT)ldtest$$$$.out; echo "$(1)"; \
- else echo "$(2)"; fi)
+ld-option = $(call checker-shell, \
+ $(CC) $(1) -nostdlib -xc /dev/null -o $$OUT, $(1), $(2))
+
+######
-###
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
# Usage:
# $(Q)$(MAKE) $(build)=dir
build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
-# Prefix -I with $(srctree) if it is not an absolute path
-addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)
+# Prefix -I with $(srctree) if it is not an absolute path,
+# add original to the end
+addtree = $(if \
+ $(filter-out -I/%, $(1)), $(patsubst -I%,-I$(srctree)/%,$(1))) $(1)
+
# Find all -I options and call addtree
-flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
+flags = $(foreach o,$($(1)), \
+ $(if $(filter -I%,$(o)), $(call addtree, $(o)), $(o)))
-# If quiet is set, only print short version of command
+# 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)))$(echo-why)';)
+
+# printing commands
cmd = @$(echo-cmd) $(cmd_$(1))
-# Add $(obj)/ for paths that is not absolute
-objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
+# Add $(obj)/ for paths that are not absolute
+objectify = $(foreach o,$(1), $(if $(filter /%,$(o)), $(o), $(obj)/$(o)))
###
-# if_changed - execute command if any prerequisite is newer than
+# if_changed - execute command if any prerequisite is newer than
# target, or command line has changed
# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
# including used config symbols
@@ -133,16 +146,12 @@ objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
# See Documentation/kbuild/makefiles.txt for more info
ifneq ($(KBUILD_NOCMDDEP),1)
-# Check if both arguments has same arguments. Result in empty string if equal
+# Check if both arguments has same arguments. Result is empty string, if equal.
# User may override this check using make KBUILD_NOCMDDEP=1
arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
$(filter-out $(cmd_$@), $(cmd_$(1))) )
endif
-# echo command. Short version is $(quiet) equals quiet, otherwise full command
-echo-cmd = $(if $($(quiet)cmd_$(1)), \
- echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
-
# >'< substitution is for echo to work,
# >$< substitution to preserve $ when reloading .cmd file
# note: when using inline perl scripts [perl -e '...$$t=1;...']
@@ -153,15 +162,15 @@ make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))
# PHONY targets skipped in both cases.
any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
-# Execute command if command has changed or prerequisitei(s) are updated
+# Execute command if command has changed or prerequisite(s) are updated.
#
if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
@set -e; \
$(echo-cmd) $(cmd_$(1)); \
echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
-# execute the command and also postprocess generated .d dependencies
-# file
+# Execute the command and also postprocess generated .d dependencies file.
+#
if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
@set -e; \
$(echo-cmd) $(cmd_$(1)); \
@@ -169,9 +178,10 @@ if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
rm -f $(depfile); \
mv -f $(dot-target).tmp $(dot-target).cmd)
+# Will check if $(cmd_foo) changed, or any of the prerequisites changed,
+# and if so will execute $(rule_foo).
# Usage: $(call if_changed_rule,foo)
-# will check if $(cmd_foo) changed, or any of the prequisites changed,
-# and if so will execute $(rule_foo)
+#
if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
@set -e; \
$(rule_$(1)))

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