source: MondoRescue/branches/2.2.5/mindi-busybox/scripts/Kbuild.include @ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 12 years ago

Update to busybox 1.7.2

File size: 5.3 KB
Line 
1####
2# kbuild: Generic definitions
3
4# Convinient variables
5comma   := ,
6squote  := '
7empty   :=
8space   := $(empty) $(empty)
9
10###
11# The temporary file to save gcc -MD generated dependencies must not
12# contain a comma
13depfile = $(subst $(comma),_,$(@D)/.$(@F).d)
14
15###
16# Escape single quote for use in echo statements
17escsq = $(subst $(squote),'\$(squote)',$1)
18
19###
20# filechk is used to check if the content of a generated file is updated.
21# Sample usage:
22# define filechk_sample
23#   echo $KERNELRELEASE
24# endef
25# version.h : Makefile
26#   $(call filechk,sample)
27# The rule defined shall write to stdout the content of the new file.
28# The existing file will be compared with the new one.
29# - If no file exist it is created
30# - If the content differ the new file is used
31# - If they are equal no change, and no timestamp update
32# - stdin is piped in from the first prerequisite ($<) so one has
33#   to specify a valid file as first prerequisite (often the kbuild file)
34define filechk
35    $(Q)set -e;             \
36    echo '  CHK     $@';            \
37    mkdir -p $(dir $@);         \
38    $(filechk_$(1)) < $< > $@.tmp;      \
39    if [ -r $@ ] && cmp -s $@ $@.tmp; then  \
40        rm -f $@.tmp;           \
41    else                    \
42        echo '  UPD     $@';        \
43        mv -f $@.tmp $@;        \
44    fi
45endef
46
47######
48# gcc support functions
49# See documentation in Documentation/kbuild/makefiles.txt
50
51# as-option
52# Usage: cflags-y += $(call as-option, -Wa$(comma)-isa=foo,)
53
54as-option = $(shell if $(CC) $(CFLAGS) $(1) -Wa,-Z -c -o /dev/null \
55         -xassembler /dev/null > /dev/null 2>&1; then echo "$(1)"; \
56         else echo "$(2)"; fi ;)
57
58# cc-option
59# Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586)
60
61cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
62             > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
63
64# hostcc-option
65# Usage: hostcflags-y += $(call hostcc-option, -march=winchip-c6, -march=i586)
66
67hostcc-option = $(shell if $(HOSTCC) $(HOSTCFLAGS) $(1) -S -o /dev/null -xc /dev/null \
68             > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
69
70# cc-option-yn
71# Usage: flag := $(call cc-option-yn, -march=winchip-c6)
72cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
73                > /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
74
75# cc-option-align
76# Prefix align with either -falign or -malign
77cc-option-align = $(subst -functions=0,,\
78    $(call cc-option,-falign-functions=0,-malign-functions=0))
79
80# cc-version
81# Usage gcc-ver := $(call cc-version, $(CC))
82cc-version = $(shell PATH="$(PATH)" $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \
83              $(if $(1), $(1), $(CC)))
84
85# cc-ifversion
86# Usage:  EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
87cc-ifversion = $(shell if [ $(call cc-version, $(CC)) $(1) $(2) ]; then \
88                       echo $(3); fi;)
89
90###
91# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
92# Usage:
93# $(Q)$(MAKE) $(build)=dir
94build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
95
96# Prefix -I with $(srctree) if it is not an absolute path
97addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)
98# Find all -I options and call addtree
99flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
100
101# If quiet is set, only print short version of command
102cmd = @$(echo-cmd) $(cmd_$(1))
103
104# Add $(obj)/ for paths that is not absolute
105objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
106
107###
108# if_changed      - execute command if any prerequisite is newer than
109#                   target, or command line has changed
110# if_changed_dep  - as if_changed, but uses fixdep to reveal dependencies
111#                   including used config symbols
112# if_changed_rule - as if_changed but execute rule instead
113# See Documentation/kbuild/makefiles.txt for more info
114
115ifneq ($(KBUILD_NOCMDDEP),1)
116# Check if both arguments has same arguments. Result in empty string if equal
117# User may override this check using make KBUILD_NOCMDDEP=1
118arg-check = $(strip $(filter-out $(1), $(2)) $(filter-out $(2), $(1)) )
119endif
120
121# echo command. Short version is $(quiet) equals quiet, otherwise full command
122echo-cmd = $(if $($(quiet)cmd_$(1)), \
123    echo '  $(call escsq,$($(quiet)cmd_$(1)))';)
124
125make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))
126
127# function to only execute the passed command if necessary
128# >'< substitution is for echo to work, >$< substitution to preserve $ when reloading .cmd file
129# note: when using inline perl scripts [perl -e '...$$t=1;...'] in $(cmd_xxx) double $$ your perl vars
130#
131if_changed = $(if $(strip $(filter-out $(PHONY),$?)          \
132        $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
133    @set -e; \
134    $(echo-cmd) $(cmd_$(1)); \
135    echo 'cmd_$@ := $(make-cmd)' > $(@D)/.$(@F).cmd)
136
137# execute the command and also postprocess generated .d dependencies
138# file
139if_changed_dep = $(if $(strip $(filter-out $(PHONY),$?)  \
140        $(filter-out FORCE $(wildcard $^),$^)    \
141    $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),     \
142    @set -e; \
143    $(echo-cmd) $(cmd_$(1)); \
144    scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(@D)/.$(@F).tmp; \
145    rm -f $(depfile); \
146    mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
147
148# Usage: $(call if_changed_rule,foo)
149# will check if $(cmd_foo) changed, or any of the prequisites changed,
150# and if so will execute $(rule_foo)
151if_changed_rule = $(if $(strip $(filter-out $(PHONY),$?)            \
152            $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),\
153            @set -e; \
154            $(rule_$(1)))
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