diff options
| -rw-r--r-- | Documentation/kbuild/makefiles.txt | 37 | ||||
| -rw-r--r-- | scripts/Makefile.build | 4 | ||||
| -rw-r--r-- | scripts/Makefile.lib | 16 | ||||
| -rwxr-xr-x | scripts/makelst | 4 |
4 files changed, 35 insertions, 26 deletions
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt index 08fbe6cd309..f099b814d38 100644 --- a/Documentation/kbuild/makefiles.txt +++ b/Documentation/kbuild/makefiles.txt @@ -276,40 +276,39 @@ more details, with real examples. --- 3.7 Compilation flags - EXTRA_CFLAGS, EXTRA_AFLAGS, EXTRA_LDFLAGS + ccflags-y, asflags-y and ldflags-y + The three flags listed above applies only to the kbuild makefile + where they are assigned. They are used for all the normal + cc, as and ld invocation happenign during a recursive build. + Note: Flags with the same behaviour were previously named: + EXTRA_CFLAGS, EXTRA_AFLAGS and EXTRA_LDFLAGS. + They are yet supported but their use are deprecated. - All the EXTRA_ variables apply only to the kbuild makefile - where they are assigned. The EXTRA_ variables apply to all - commands executed in the kbuild makefile. - - $(EXTRA_CFLAGS) specifies options for compiling C files with - $(CC). + ccflags-y specifies options for compiling C files with $(CC). Example: # drivers/sound/emu10k1/Makefile - EXTRA_CFLAGS += -I$(obj) - ifdef DEBUG - EXTRA_CFLAGS += -DEMU10K1_DEBUG - endif + ccflags-y += -I$(obj) + ccflags-$(DEBUG) += -DEMU10K1_DEBUG This variable is necessary because the top Makefile owns the variable $(KBUILD_CFLAGS) and uses it for compilation flags for the entire tree. - $(EXTRA_AFLAGS) is a similar string for per-directory options + asflags-y is a similar string for per-directory options when compiling assembly language source. Example: #arch/x86_64/kernel/Makefile - EXTRA_AFLAGS := -traditional + asflags-y := -traditional - $(EXTRA_LDFLAGS) is a string for per-directory options to $(LD). + ldflags-y is a string for per-directory options to $(LD). Example: #arch/m68k/fpsp040/Makefile - EXTRA_LDFLAGS := -x + ldflags-y := -x CFLAGS_$@, AFLAGS_$@ @@ -495,9 +494,9 @@ more details, with real examples. Example: #fs/reiserfs/Makefile - EXTRA_CFLAGS := $(call cc-ifversion, -lt, 0402, -O1) + ccflags-y := $(call cc-ifversion, -lt, 0402, -O1) - In this example, EXTRA_CFLAGS will be assigned the value -O1 if the + In this example, ccflags-y will be assigned the value -O1 if the $(CC) version is less than 4.2. cc-ifversion takes all the shell operators: -eq, -ne, -lt, -le, -gt, and -ge @@ -783,7 +782,7 @@ When kbuild executes, the following steps are followed (roughly): Example: #arch/s390/Makefile LDFLAGS := -m elf_s390 - Note: EXTRA_LDFLAGS can be used to further customise + Note: ldflags-y can be used to further customise the flags used. See chapter 3.7. LDFLAGS_MODULE Options for $(LD) when linking modules @@ -1100,7 +1099,7 @@ When kbuild executes, the following steps are followed (roughly): When building the *.lds target, kbuild uses the variables: KBUILD_CPPFLAGS : Set in top-level Makefile - EXTRA_CPPFLAGS : May be set in the kbuild makefile + cppflags-y : May be set in the kbuild makefile CPPFLAGS_$(@F) : Target specific flags. Note that the full filename is used in this assignment. diff --git a/scripts/Makefile.build b/scripts/Makefile.build index d32b40048f1..de9836eee8b 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -22,6 +22,10 @@ EXTRA_AFLAGS := EXTRA_CFLAGS := EXTRA_CPPFLAGS := EXTRA_LDFLAGS := +asflags-y := +ccflags-y := +cppflags-y := +ldflags-y := # Read .config if it exist, otherwise ignore -include include/config/auto.conf diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib index 95e6e0fbdbd..3c5e88bfecf 100644 --- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib @@ -1,3 +1,9 @@ +# Backward compatibility +asflags-y += $(EXTRA_AFLAGS) +ccflags-y += $(EXTRA_CFLAGS) +cppflags-y += $(EXTRA_CPPFLAGS) +ldflags-y += $(EXTRA_LDFLAGS) + # Figure out what we need to build from the various variables # =========================================================================== @@ -84,9 +90,9 @@ basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))" modname_flags = $(if $(filter 1,$(words $(modname))),\ -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))") -_c_flags = $(KBUILD_CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$(basetarget).o) -_a_flags = $(KBUILD_AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o) -_cpp_flags = $(KBUILD_CPPFLAGS) $(EXTRA_CPPFLAGS) $(CPPFLAGS_$(@F)) +_c_flags = $(KBUILD_CFLAGS) $(ccflags-y) $(CFLAGS_$(basetarget).o) +_a_flags = $(KBUILD_AFLAGS) $(asflags-y) $(AFLAGS_$(basetarget).o) +_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F)) # If building the kernel in a separate objtree expand all occurrences # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/'). @@ -115,7 +121,7 @@ a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \ cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(__cpp_flags) -ld_flags = $(LDFLAGS) $(EXTRA_LDFLAGS) +ld_flags = $(LDFLAGS) $(ldflags-y) # Finds the multi-part object the current object will be linked into modname-multi = $(sort $(foreach m,$(multi-used),\ @@ -145,7 +151,7 @@ $(obj)/%:: $(src)/%_shipped # --------------------------------------------------------------------------- quiet_cmd_ld = LD $@ -cmd_ld = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LDFLAGS_$(@F)) \ +cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \ $(filter-out FORCE,$^) -o $@ # Objcopy diff --git a/scripts/makelst b/scripts/makelst index 4fc80f2b7e1..e6581496d82 100755 --- a/scripts/makelst +++ b/scripts/makelst @@ -3,8 +3,8 @@ # with correct relocations from System.map # Requires the following lines in makefile: #%.lst: %.c -# $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -g -c -o $*.o $< -# $(srctree)/scripts/makelst $*.o $(objtree)/System.map $(OBJDUMP) +# $(CC) $(c_flags) -g -c -o $*.o $< && +# $(srctree)/scripts/makelst $*.o System.map $(OBJDUMP) > $@ # # Copyright (C) 2000 IBM Corporation # Author(s): DJ Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) |