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ARM: 7333/2: jump label: detect %c support for ARM

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Some versions of ARM GCC which do support asm goto, do not support
the %c specifier.  Since we need the %c to support jump labels
on ARM, detect that too in the asm goto detection script to avoid
build errors with these versions.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48637

Acked-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Rabin Vincent 2012-02-24 17:06:20 +01:00 committed by Russell King
parent 9b5a146a43
commit a9468f30b5
1 changed files with 17 additions and 1 deletions
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18
scripts/gcc-goto.sh
View file

@ -2,4 +2,20 @@
# Test for gcc 'asm goto' support # Test for gcc 'asm goto' support
# Copyright (C) 2010, Jason Baron <jbaron@redhat.com> # Copyright (C) 2010, Jason Baron <jbaron@redhat.com>
echo "int main(void) { entry: asm goto (\"\"::::entry); return 0; }" | $@ -x c - -c -o /dev/null >/dev/null 2>&1 && echo "y" cat << "END" | $@ -x c - -c -o /dev/null >/dev/null 2>&1 && echo "y"
int main(void)
{
#ifdef __arm__
/*
* Not related to asm goto, but used by jump label
* and broken on some ARM GCC versions (see GCC Bug 48637).
*/
static struct { int dummy; int state; } tp;
asm (".long %c0" :: "i" (&tp.state));
#endif
entry:
asm goto ("" :::: entry);
return 0;
}
END