commit eb3f2083f91fa2c48bad4c997f5d8a4378aaf04e
author Lucio De Re <lucio.dere@gmail.com> Mon Jul 25 13:45:44 2011 -0400
committer Russ Cox <rsc@golang.org> Mon Jul 25 13:45:44 2011 -0400
tree c8347a2c138815cce5a36832e345b45abbf7eda4
parent 12995e2d359e699693d0c56d2e5ed1fab3c7c479

build: define getcallerpc in u.h (fix for Plan 9 build)

. By defining getcallerpc(x) as __builtin_return_address(0)
  here, it becomes possible to use the Plan 9 compatible form
  when compiling using GCC.  The alternative is to add conditional
  compilation based on the compiler identity in "cmd/8g/gsubr.c"
  to distinguish between the two cases.

R=golang-dev
CC=golang-dev, rsc
https://golang.org/cl/4800048

include/u.h

diff --git a/include/u.h b/include/u.h
index 9ee7493..44bfcd6 100644
--- a/include/u.h
+++ b/include/u.h
@@ -194,6 +194,8 @@
 #undef _NEEDUINT
 #undef _NEEDULONG
 
+#define getcallerpc(x)	__builtin_return_address(0)
+
 #ifndef SIGBUS
 #define SIGBUS SIGSEGV /* close enough */
 #endif