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authorRabin Vincent <rabin@rab.in>2012-02-24 17:06:20 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-03-24 09:38:56 +0000
commita9468f30b5eac6957c86aea97954553bfb7c1f18 (patch)
treec8da55b18abf5d848282e95b04ccadb21839f081 /scripts/gcc-goto.sh
parent9b5a146a43db3733c731d47022f4f5259e6b31e6 (diff)
downloadvexpress-lsk-a9468f30b5eac6957c86aea97954553bfb7c1f18.tar.gz
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.sh18
1 files changed, 17 insertions, 1 deletions
diff --git a/scripts/gcc-goto.sh b/scripts/gcc-goto.sh
index 98cffcb941e..a2af2e88daf 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