From c4184f117af7441fb83bc413d2214d92920e0289 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Wed, 7 Feb 2007 20:24:25 -0800 Subject: [PATCH] kbuild: make $(checker-shell ) strip spaces around the result It looks like GNU make version 3.80 (but apparently not 3.81) adds leading whitespace to the result of the checker-shell execution. This strips them off explicitly. Also, don't bother symlinking the output file to /dev/null. It's likely as expensive as just writing the temp-file, and we need to remove it anyway afterwards. Signed-off-by: Linus Torvalds --- scripts/Kbuild.include | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include index d65c40331e66..8d7eabf238c0 100644 --- a/scripts/Kbuild.include +++ b/scripts/Kbuild.include @@ -60,17 +60,16 @@ endef # 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 + $(strip $(shell set -e; \ DIR=$(KBUILD_EXTMOD); \ cd $${DIR:-$(objtree)}; \ OUT=$$PWD/.$$$$.null; \ - \ - ln -s /dev/null $$OUT; \ if $(1) >/dev/null 2>&1; \ then echo "$(2)"; \ else echo "$(3)"; \ fi; \ - rm -f $$OUT) + rm -f $$OUT)) endef # as-option -- 2.20.1