1 ### 2 # build: Generic definitions 3 # 4 # Lots of this code have been borrowed or heavily inspired from parts 5 # of kbuild code, which is not credited, but mostly developed by: 6 # 7 # Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015 8 # Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015 9 # 10 11 ### 12 # Convenient variables 13 comma := , 14 squote := ' 15 pound := \# 16 17 ### 18 # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o 19 dot-target = $(dir $@).$(notdir $@) 20 21 ### 22 # filename of target with directory and extension stripped 23 basetarget = $(basename $(notdir $@)) 24 25 ### 26 # The temporary file to save gcc -MD generated dependencies must not 27 # contain a comma 28 depfile = $(subst $(comma),_,$(dot-target).d) 29 30 ### 31 # Check if both arguments has same arguments. Result is empty string if equal. 32 arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ 33 $(filter-out $(cmd_$@), $(cmd_$(1))) ) 34 35 ### 36 # Escape single quote for use in echo statements 37 escsq = $(subst $(squote),'\$(squote)',$1) 38 39 # Echo command 40 # Short version is used, if $(quiet) equals `quiet_', otherwise full one. 41 echo-cmd = $(if $($(quiet)cmd_$(1)),\ 42 echo ' $(call escsq,$($(quiet)cmd_$(1)))';) 43 44 ### 45 # Replace >$< with >$$< to preserve $ when reloading the .cmd file 46 # (needed for make) 47 # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file 48 # (needed for make) 49 # Replace >'< with >'\''< to be able to enclose the whole string in '...' 50 # (needed for the shell) 51 make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))) 52 53 ### 54 # Find any prerequisites that is newer than target or that does not exist. 55 # PHONY targets skipped in both cases. 56 any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) 57 58 ### 59 # Copy dependency data into .cmd file 60 # - gcc -M dependency info 61 # - command line to create object 'cmd_object :=' 62 dep-cmd = $(if $(wildcard $(fixdep)), \ 63 $(fixdep) $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp; \ 64 rm -f $(depfile); \ 65 mv -f $(dot-target).tmp $(dot-target).cmd, \ 66 printf '$(pound) cannot find fixdep (%s)\n' $(fixdep) > $(dot-target).cmd; \ 67 printf '$(pound) using basic dep data\n\n' >> $(dot-target).cmd; \ 68 cat $(depfile) >> $(dot-target).cmd; \ 69 printf '\n%s\n' 'cmd_$@ := $(make-cmd)' >> $(dot-target).cmd) 70 71 ### 72 # if_changed_dep - execute command if any prerequisite is newer than 73 # target, or command line has changed and update 74 # dependencies in the cmd file 75 if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)), \ 76 @set -e; \ 77 $(echo-cmd) $(cmd_$(1)); \ 78 $(dep-cmd)) 79 80 # if_changed - execute command if any prerequisite is newer than 81 # target, or command line has changed 82 if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ 83 @set -e; \ 84 $(echo-cmd) $(cmd_$(1)); \ 85 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) 86 87 ### 88 # C flags to be used in rule definitions, includes: 89 # - depfile generation 90 # - global $(CFLAGS) 91 # - per target C flags 92 # - per object C flags 93 # - BUILD_STR macro to allow '-D"$(variable)"' constructs 94 c_flags_1 = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj)) 95 c_flags_2 = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(c_flags_1)) 96 c_flags = $(filter-out $(CFLAGS_REMOVE_$(obj)), $(c_flags_2)) 97 cxx_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CXXFLAGS) -D"BUILD_STR(s)=\#s" $(CXXFLAGS_$(basetarget).o) $(CXXFLAGS_$(obj)) 98 99 ### 100 ## HOSTCC C flags 101 102 host_c_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(HOSTCFLAGS) -D"BUILD_STR(s)=\#s" $(HOSTCFLAGS_$(basetarget).o) $(HOSTCFLAGS_$(obj)) 103 104 # output directory for tests below 105 TMPOUT = .tmp_$$$$ 106 107 # try-run 108 # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) 109 # Exit code chooses option. "$$TMP" serves as a temporary file and is 110 # automatically cleaned up. 111 try-run = $(shell set -e; \ 112 TMP=$(TMPOUT)/tmp; \ 113 mkdir -p $(TMPOUT); \ 114 trap "rm -rf $(TMPOUT)" EXIT; \ 115 if ($(1)) >/dev/null 2>&1; \ 116 then echo "$(2)"; \ 117 else echo "$(3)"; \ 118 fi) 119 120 # cc-option 121 # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) 122 cc-option = $(call try-run, \ 123 $(CC) -Werror $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2)) 124 125 # delete partially updated (i.e. corrupted) files on error 126 .DELETE_ON_ERROR:
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