[PATCH] [1/2] kbuild: Add a really-ld-option macro

From: Andi Kleen <andi@xxxxxxxxxxxxxx>
Date: Wed, 16 Sep 2009 22:36:54 +0200 (CEST)

Different from the existing ld macro by checking $(LD)

Needed for the next patch

Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>

---
scripts/Kbuild.include | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

Index: linux-2.6.31-ak/scripts/Kbuild.include
===================================================================
--- linux-2.6.31-ak.orig/scripts/Kbuild.include
+++ linux-2.6.31-ak/scripts/Kbuild.include
@@ -83,11 +83,12 @@ TMPOUT := $(if $(KBUILD_EXTMOD),$(firstw
# is automatically cleaned up.
try-run = $(shell set -e; \
TMP="$(TMPOUT).$$$$.tmp"; \
+ TMPO="$(TMPOUT).$$$$.o"; \
if ($(1)) >/dev/null 2>&1; \
then echo "$(2)"; \
else echo "$(3)"; \
fi; \
- rm -f "$$TMP")
+ rm -f "$$TMP" "$$TMPO")

# as-option
# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
@@ -135,6 +136,12 @@ cc-ifversion = $(shell [ $(call cc-versi
ld-option = $(call try-run,\
$(CC) $(1) -nostdlib -xc /dev/null -o "$$TMP",$(1),$(2))

+# really-ld-option
+# checks $(LD) unlike ld-option
+# Usage: LDFLAGS += $(call really-ld-option, -X)
+really-ld-option = $(call try-run,\
+ $(CC) /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
+
######

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Follow-Ups:
- Re: [PATCH] [1/2] kbuild: Add a really-ld-option macro
  - From: Sam Ravnborg

References:
- [PATCH] [0/2] Updated patches for gold -X probing
  - From: Andi Kleen

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