Mercurial > illumos > illumos-gate
diff usr/src/lib/libc/port/unwind/unwind.c @ 13726:056b82d21d71
1450 Illumos should be buildable with GCC4
Reviewed by: Joshua M. Clulow <josh@sysmgr.org>
Reviewed by: Keith Wesolowski <keith.wesolowski@joyent.com>
Reviewed by: Gordon Ross <gwr@nexenta.com>
Reviewed by: Albert Lee <trisk@nexenta.com>
Approved by: Gordon Ross <gwr@nexenta.com>
| author | Richard Lowe <richlowe@richlowe.net> |
|---|---|
| date | Sat, 14 Apr 2012 20:29:22 -0400 |
| parents | febeba71273d |
| children |
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--- a/usr/src/lib/libc/port/unwind/unwind.c Thu Jun 14 08:00:26 2012 -0700 +++ b/usr/src/lib/libc/port/unwind/unwind.c Sat Apr 14 20:29:22 2012 -0400 @@ -24,8 +24,6 @@ * Use is subject to license terms. */ -#pragma ident "%Z%%M% %I% %E% SMI" - #include "lint.h" #include "thr_uberdata.h" #include <dlfcn.h> @@ -40,9 +38,13 @@ * _ex_unwind() is provided by libC, but if libC is not loaded we * need to call a local version of _ex_unwind() which does exactly * the same thing except for calling C++ destructors. + * + * Note that neither of these literally "returns twice" as, for eg, setjmp + * does, but they induce unusual control flow which the compiler should treat + * in the same manner (make all registers dead, etc.). */ -extern void _ex_clnup_handler(void *, void (*)(void *)); -extern void _ex_unwind_local(void); +extern void _ex_clnup_handler(void *, void (*)(void *)) __RETURNS_TWICE; +extern void _ex_unwind_local(void) __RETURNS_TWICE; #pragma unknown_control_flow(_ex_clnup_handler) #pragma unknown_control_flow(_ex_unwind_local)