Commit beda9f3a authored by Roman Zippel's avatar Roman Zippel Committed by Linus Torvalds

[PATCH] kbuild: more Makefile cleanups

This adds the remaining changes which should have been part of the
review process.

 - the define command is inappropriate (it's primarily for rule
   definitions)
 - execute commands in the current dir as all other commands
 - .*.tmp (but not .*.null) files are also removed up by "make clean"
 - printf has other side effects, just use "echo -e"
 - proper quoting
 - proper indentation
Signed-off-by: default avatarRoman Zippel <zippel@linux-m68k.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2fd592e4
####
# kbuild: Generic definitions
# Convenient constants
# Convenient variables
comma := ,
squote := '
empty :=
......@@ -56,44 +56,48 @@ endef
# gcc support functions
# See documentation in Documentation/kbuild/makefiles.txt
# 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/.$$$$.null; \
if $(1) >/dev/null 2>&1; \
then echo "$(2)"; \
else echo "$(3)"; \
fi; \
rm -f $$OUT)
endef
# output directory for tests below
TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
# try-run
# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
# Exit code chooses option. "$$TMP" is can be used as temporary file and
# is automatically cleaned up.
try-run = $(shell set -e; \
TMP="$(TMPOUT).$$$$.tmp"; \
if ($(1)) >/dev/null 2>&1; \
then echo "$(2)"; \
else echo "$(3)"; \
fi; \
rm -f "$$TMP")
# as-option
# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
as-option = $(call checker-shell,\
$(CC) $(CFLAGS) $(1) -c -xassembler /dev/null -o $$OUT,$(1),$(2))
as-option = $(call try-run,\
$(CC) $(CFLAGS) $(1) -c -xassembler /dev/null -o "$$TMP",$(1),$(2))
# as-instr
# Usage: cflags-y += $(call as-instr,instr,option1,option2)
as-instr = $(call checker-shell,\
printf "$(1)" | $(CC) $(AFLAGS) -c -xassembler -o $$OUT -,$(2),$(3))
as-instr = $(call try-run,\
echo -e "$(1)" | $(CC) $(AFLAGS) -c -xassembler -o "$$TMP" -,$(2),$(3))
# cc-option
# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
cc-option = $(call checker-shell,\
$(CC) $(CFLAGS) $(if $(3),$(3),$(1)) -S -xc /dev/null -o $$OUT,$(1),$(2))
cc-option = $(call try-run,\
$(CC) $(CFLAGS) $(1) -S -xc /dev/null -o "$$TMP",$(1),$(2))
# cc-option-yn
# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
cc-option-yn = $(call cc-option,"y","n",$(1))
cc-option-yn = $(call try-run,\
$(CC) $(CFLAGS) $(1) -S -xc /dev/null -o "$$TMP",y,n)
# cc-option-align
# Prefix align with either -falign or -malign
cc-option-align = $(subst -functions=0,,\
$(call cc-option,-falign-functions=0,-malign-functions=0))
$(call cc-option,-falign-functions=0,-malign-functions=0))
# cc-version
# Usage gcc-ver := $(call cc-version,$(CC))
......@@ -105,24 +109,22 @@ cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
# ld-option
# Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both)
ld-option = $(call checker-shell,\
$(CC) $(1) -nostdlib -xc /dev/null -o $$OUT,$(1),$(2))
ld-option = $(call try-run,\
$(CC) $(1) -nostdlib -xc /dev/null -o "$$TMP",$(1),$(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,
# add original to the end
addtree = $(if \
$(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)
# Prefix -I with $(srctree) if it is not an absolute path.
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)))
# echo command.
# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
......@@ -144,7 +146,7 @@ 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 is 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))) )
......@@ -168,7 +170,6 @@ if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
# 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)); \
......@@ -176,10 +177,9 @@ 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) or any of the prerequisites 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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