path: root/scripts
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authorMasahiro Yamada <yamada.masahiro@socionext.com>2019-02-20 13:23:56 +0900
committerMasahiro Yamada <yamada.masahiro@socionext.com>2019-02-27 21:41:27 +0900
commitbd55f96fa9fc29702ec30d75a4290bdadb00209d (patch)
tree8848f6aab1d11366e62a767e3e36dd4cf021c240 /scripts
parentkbuild: hardcode genksyms path and remove GENKSYMS variable (diff)
kbuild: refactor cc-cross-prefix implementation
- $(word 1, <text>) is equivalent to $(firstword <text>) - hardcode "gcc" instead of $(CC) - minimize the shell script part A little more notes in case $(filter-out -%, ...) is not clear. arch/mips/Makefile passes prefixes depending on the configuration. CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux- \ $(tool-archpref)-linux-gnu- $(tool-archpref)-unknown-linux-gnu-) In the Kconfig stage (e.g. when you run 'make defconfig'), neither CONFIG_32BIT nor CONFIG_64BIT is defined. So, $(tool-archpref) is empty. As a result, "-linux -linux-gnu- -unknown-linux-gnu" is passed into cc-cross-prefix. The command 'which' assumes arguments starting with a hyphen as command options, then emits the following messages: Illegal option -l Illegal option -l Illegal option -u I think it is strange to define CROSS_COMPILE depending on the CONFIG options since you need to feed $(CC) to Kconfig, but it is how MIPS Makefile currently works. Anyway, it would not hurt to filter-out invalid strings beforehand. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'scripts')
1 files changed, 4 insertions, 8 deletions
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index d93250b33bf6..c1e15a4aee36 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -71,14 +71,10 @@ 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)))
+# Return first <prefix> where a <prefix>gcc is found in PATH.
+# If no gcc found in PATH with listed prefixes return nothing
+cc-cross-prefix = $(firstword $(foreach c, $(filter-out -%, $(1)), \
+ $(if $(shell which $(c)gcc), $(c))))
# output directory for tests below
TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)