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[LTO][PATCH] Handle -fexceptions properly.
- From: "=?big5?b?RG91ZyBLd2FuICjD9q62vHcp?=" <dougkwan at google dot com>
- To: gcc-patches <gcc-patches at gcc dot gnu dot org>, "Diego Novillo" <dnovillo at google dot com>
- Date: Tue, 21 Oct 2008 23:53:32 -0700
- Subject: [LTO][PATCH] Handle -fexceptions properly.
Hi,
This patch handles the -fexceptions flag properly in LTO.
Previously we unconditionally set flag_exceptions flag to 1 even when
-fno-exceptions is given in command line. This patch also disable a
check for NOTHROW compatibility check when -fno-exceptions is given to
LTO.
-Doug
2008-10-21 Doug Kwan <dougkwan@google.com>
* lto.c (lto_fixup_tree): Check for NOTHROW conflict only if
exceptions flag is set.
* lto-lang.c: (lto_init_options) Set default exceptions flag.
(lto_init_eh): Remove exceptions flag initialization.
Index: gcc/gcc/lto/lto.c
===================================================================
--- gcc/gcc/lto/lto.c (revision 141288)
+++ gcc/gcc/lto/lto.c (working copy)
@@ -811,6 +811,7 @@ lto_fixup_tree (tree *tp, int *walk_subt
if (t != prevailing)
{
if (TREE_CODE (t) == FUNCTION_DECL
+ && flag_exceptions
&& TREE_NOTHROW (prevailing) != TREE_NOTHROW (t))
{
if (TREE_NOTHROW (prevailing))
Index: gcc/gcc/lto/lto-lang.c
===================================================================
--- gcc/gcc/lto/lto-lang.c (revision 141288)
+++ gcc/gcc/lto/lto-lang.c (working copy)
@@ -664,6 +664,9 @@ lto_init_options (unsigned int argc ATTR
decisions about what to output. */
flag_unit_at_a_time = 1;
+ /* Enable exceptions by default. */
+ flag_exceptions = 1;
+
return CL_LTO;
}
@@ -993,7 +996,6 @@ static void
lto_init_eh (void)
{
/* GIMPLE supports exceptions. */
- flag_exceptions = 1;
eh_personality_libfunc = init_one_libfunc (USING_SJLJ_EXCEPTIONS
? "__gcc_personality_sj0"
: "__gcc_personality_v0");