linux-kernel - [PATCH] parisc: suppress error messages for 'make clean'

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Date:   Sat, 25 Apr 2020 14:46:59 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     "James E . J . Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>, linux-parisc@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: [PATCH] parisc: suppress error messages for 'make clean'

'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@...nel.org>
---

 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