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

1 files changed, 7 insertions, 1 deletions

diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 94a4f682f385..b3452601b0b1 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -83,11 +83,12 @@ TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
 # 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 +136,11 @@ cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
 cc-ldoption = $(call try-run,\
         $(CC) $(1) -nostdlib -xc /dev/null -o "$$TMP",$(1),$(2))
 
+# ld-option
+# Usage: LDFLAGS += $(call ld-option, -X)
+ld-option = $(call try-run,\
+        $(CC) /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
+
 ######
 
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