####
# kbuild: Generic definitions
-# Convenient constants
+# Convenient variables
comma := ,
squote := '
empty :=
# - If they are equal no change, and no timestamp update
# - stdin is piped in from the first prerequisite ($<) so one has
# to specify a valid file as first prerequisite (often the kbuild file)
+ quiet_chk_filechk = echo ' CHK $@'
+silent_chk_filechk = :
+ quiet_upd_filechk = echo ' UPD $@'
+silent_upd_filechk = :
define filechk
$(Q)set -e; \
- echo ' CHK $@'; \
+ $($(quiet)chk_filechk); \
mkdir -p $(dir $@); \
$(filechk_$(1)) < $< > $@.tmp; \
if [ -r $@ ] && cmp -s $@ $@.tmp; then \
rm -f $@.tmp; \
else \
- echo ' UPD $@'; \
+ $($(quiet)upd_filechk); \
mv -f $@.tmp $@; \
fi
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
+# cc-cross-prefix
+# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
+# Return first prefix where a prefix$(CC) is found in PATH.
+# If no $(CC) found in PATH with listed prefixes return nothing
+cc-cross-prefix = \
+ $(word 1, $(foreach c,$(1), \
+ $(shell set -e; \
+ if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
+ echo $(c); \
+ fi)))
+
+# 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 $$OUT,$(1),$(2))
+
+as-option = $(call try-run,\
+ $(CC) $(KBUILD_CFLAGS) $(1) -c -xassembler /dev/null -o "$$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 $$OUT -,$(2),$(3))
+
+as-instr = $(call try-run,\
+ echo -e "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$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 $$OUT,$(1),$(2))
+
+cc-option = $(call try-run,\
+ $(CC) $(KBUILD_CFLAGS) $(1) -S -xc /dev/null -o "$$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) $(KBUILD_CFLAGS) $(1) -S -xc /dev/null -o "$$TMP",y,n)
# cc-option-align
# Prefix align with either -falign or -malign
cc-option-align = $(subst -functions=0,,\
- $(call cc-option,-falign-functions=0,-malign-functions=0))
+ $(call cc-option,-falign-functions=0,-malign-functions=0))
# cc-version
-# Usage gcc-ver := $(call cc-version,$(CC))
+# Usage gcc-ver := $(call cc-version)
cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
+# cc-fullversion
+# Usage gcc-ver := $(call cc-fullversion)
+cc-fullversion = $(shell $(CONFIG_SHELL) \
+ $(srctree)/scripts/gcc-version.sh -p $(CC))
+
# cc-ifversion
# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
# ld-option
# Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both)
-ld-option = $(call checker-shell,\
- $(CC) $(1) -nostdlib -xc /dev/null -o $$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 $(quiet) equals `quiet_', otherwise full one.
# See Documentation/kbuild/makefiles.txt for more info
ifneq ($(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))) )
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)); \
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)))
git.samba.org / sfrench / cifs-2.6.git / blobdiff