linux-kernel - [PATCH v2] init/Kconfig: fix CC_HAS_ASM_GOTO_TIED

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Message-Id: <20221115110158.2207117-1-alexandre.belloni@bootlin.com>
Date:   Tue, 15 Nov 2022 12:01:58 +0100
From:   alexandre.belloni@...tlin.com
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] init/Kconfig: fix CC_HAS_ASM_GOTO_TIED_OUTPUT test with dash

From: Alexandre Belloni <alexandre.belloni@...tlin.com>

When using dash as /bin/sh, the CC_HAS_ASM_GOTO_TIED_OUTPUT test fails
with a syntax error which is not the one we are looking for:

<stdin>: In function ‘foo’:
<stdin>:1:29: warning: missing terminating " character
<stdin>:1:29: error: missing terminating " character
<stdin>:2:5: error: expected ‘:’ before ‘+’ token
<stdin>:2:7: warning: missing terminating " character
<stdin>:2:7: error: missing terminating " character
<stdin>:2:5: error: expected declaration or statement at end of input

Removing '\n' solves this.

Fixes: 1aa0e8b144b6 ("Kconfig: Add option for asm goto w/ tied outputs to workaround clang-13 bug")
Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 init/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/init/Kconfig b/init/Kconfig
index 694f7c160c9c..13e93bcbc807 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -87,7 +87,7 @@ config CC_HAS_ASM_GOTO_OUTPUT
 config CC_HAS_ASM_GOTO_TIED_OUTPUT
 	depends on CC_HAS_ASM_GOTO_OUTPUT
 	# Detect buggy gcc and clang, fixed in gcc-11 clang-14.
-	def_bool $(success,echo 'int foo(int *x) { asm goto (".long (%l[bar]) - .\n": "+m"(*x) ::: bar); return *x; bar: return 0; }' | $CC -x c - -c -o /dev/null)
+	def_bool $(success,echo 'int foo(int *x) { asm goto (".long (%l[bar]) - .": "+m"(*x) ::: bar); return *x; bar: return 0; }' | $CC -x c - -c -o /dev/null)
 
 config TOOLS_SUPPORT_RELR
 	def_bool $(success,env "CC=$(CC)" "LD=$(LD)" "NM=$(NM)" "OBJCOPY=$(OBJCOPY)" $(srctree)/scripts/tools-support-relr.sh)
-- 
2.38.1