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kbuild: introduce ld-option
ld-option is used to check if $(LD) supports a specific option. Based on patch from Andi Kleen. Cc: Andi Kleen <ak@linux.intel.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org> First use is to check if option -X is supported (upcoming patch). Theis is ne
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@ -18,6 +18,7 @@ This document describes the Linux kernel Makefiles.
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--- 3.9 Dependency tracking
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--- 3.10 Special Rules
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--- 3.11 $(CC) support functions
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--- 3.12 $(LD) support functions
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=== 4 Host Program support
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--- 4.1 Simple Host Program
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@ -570,6 +571,19 @@ more details, with real examples.
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endif
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endif
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--- 3.12 $(LD) support functions
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ld-option
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ld-option is used to check if $(LD) supports the supplied option.
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ld-option takes two options as arguments.
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The second argument is an optional option that can be used if the
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first option is not supported by $(LD).
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Example:
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#Makefile
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LDFLAGS_vmlinux += $(call really-ld-option, -X)
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=== 4 Host Program support
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Kbuild supports building executables on the host for use during the
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@ -83,11 +83,12 @@ TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
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# is automatically cleaned up.
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try-run = $(shell set -e; \
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TMP="$(TMPOUT).$$$$.tmp"; \
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TMPO="$(TMPOUT).$$$$.o"; \
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if ($(1)) >/dev/null 2>&1; \
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then echo "$(2)"; \
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else echo "$(3)"; \
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fi; \
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rm -f "$$TMP")
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rm -f "$$TMP" "$$TMPO")
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# as-option
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# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
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@ -135,6 +136,11 @@ cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
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cc-ldoption = $(call try-run,\
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$(CC) $(1) -nostdlib -xc /dev/null -o "$$TMP",$(1),$(2))
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# ld-option
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# Usage: LDFLAGS += $(call ld-option, -X)
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ld-option = $(call try-run,\
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$(CC) /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
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######
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###
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