'make ARCH=parisc clean' emits a tons of error messages as follows:
$ make ARCH=parisc clean
gcc: error: unrecognized command line option '-mno-space-regs'
gcc: error: unrecognized command line option '-mfast-indirect-calls'; did you mean '-mforce-indirect-call'?
gcc: error: unrecognized command line option '-mdisable-fpregs'
gcc: error: missing argument to '-Wframe-larger-than='
gcc: error: unrecognized command line option '-mno-space-regs'
gcc: error: unrecognized command line option '-mfast-indirect-calls'; did you mean '-mforce-indirect-call'?
gcc: error: unrecognized command line option '-mdisable-fpregs'
gcc: error: missing argument to '-Wframe-larger-than='
...
You can supporess them except '-Wframe-larger-than' by setting correct
CROSS_COMPILE=, but we should not require any compiler for cleaning.
This $(shell ...) is evaluated so many times because LIBGCC is exported.
Use the ':=' operator to evaluate it just once, and sink the stderr.
Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
---
arch/parisc/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile
index 628cd8bb7ad8..d82787da43cd 100644
--- a/arch/parisc/Makefile
+++ b/arch/parisc/Makefile
@@ -21,7 +21,7 @@ KBUILD_IMAGE := vmlinuz
NM = sh $(srctree)/arch/parisc/nm
CHECKFLAGS += -D__hppa__=1
-LIBGCC = $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
+LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name 2>/dev/null)
export LIBGCC
ifdef CONFIG_64BIT
--
2.25.1
