linux-kernel - [PATCH] scripts/gcc-goto.sh: Show stdout and stderr for potential errors

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Date:   Thu, 9 Aug 2018 16:34:45 +0800
From:   <zhe.he@...driver.com>
To:     <tglx@...utronix.de>, <kstewart@...uxfoundation.org>,
        <pombredanne@...b.com>, <gregkh@...uxfoundation.org>,
        <linux-kernel@...r.kernel.org>
CC:     <zhe.he@...driver.com>
Subject: [PATCH] scripts/gcc-goto.sh: Show stdout and stderr for potential errors

From: He Zhe <zhe.he@...driver.com>

The check may fail not only because ${CC} does not support the asm
feature, but also due to potential defects of ${CC} itself like what
we experienced below or even it's missing.

Assembler messages:
Fatal error: The input and output files must be distinct
(introduced by binutils-2.31 "Stop the assembler from overwriting its
output file.")

This patch enables stdout and stderr to give user direct error
information for those cases, while not polluting the output for normal
cases.

Signed-off-by: He Zhe <zhe.he@...driver.com>
---
 scripts/gcc-goto.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/gcc-goto.sh b/scripts/gcc-goto.sh
index 083c526..bd7fc8eb 100755
--- a/scripts/gcc-goto.sh
+++ b/scripts/gcc-goto.sh
@@ -3,7 +3,7 @@
 # Test for gcc 'asm goto' support
 # Copyright (C) 2010, Jason Baron <jbaron@...hat.com>
 
-cat << "END" | $@ -x c - -c -o /dev/null >/dev/null 2>&1 && echo "y"
+cat << "END" | $@ -x c - -c -o /dev/null && echo "y"
 int main(void)
 {
 #if defined(__arm__) || defined(__aarch64__)
-- 
2.7.4