diff options
| author | Rabin Vincent <rabin@rab.in> | 2012-02-24 17:06:20 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-03-24 10:38:56 +0100 |
| commit | a9468f30b5eac6957c86aea97954553bfb7c1f18 (patch) | |
| tree | c8da55b18abf5d848282e95b04ccadb21839f081 /scripts/gcc-goto.sh | |
| parent | ARM: 7338/1: add support for early console output via semihosting (diff) | |
| download | linux-a9468f30b5eac6957c86aea97954553bfb7c1f18.tar.xz linux-a9468f30b5eac6957c86aea97954553bfb7c1f18.zip | |
ARM: 7333/2: jump label: detect %c support for ARM
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>
Diffstat (limited to 'scripts/gcc-goto.sh')
| -rw-r--r-- | scripts/gcc-goto.sh | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/scripts/gcc-goto.sh b/scripts/gcc-goto.sh index 98cffcb941ea..a2af2e88daf3 100644 --- a/scripts/gcc-goto.sh +++ b/scripts/gcc-goto.sh @@ -2,4 +2,20 @@ # Test for gcc 'asm goto' support # 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 |