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Re: c/8828: [3.2/3.3 regression] gcc reports some code is unreachable when it is not
- From: Janis Johnson <janis187 at us dot ibm dot com>
- To: gcc-gnats at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, rcampbell at tropicnetworks dot com, gcc-bugs at gcc dot gnu dot org, nobody at gcc dot gnu dot org
- Date: Tue, 24 Dec 2002 12:28:20 -0800
- Subject: Re: c/8828: [3.2/3.3 regression] gcc reports some code is unreachable when it is not
- Organization: IBM
- Reply-to: janis187 at us dot ibm dot com
The regression reported in PR c/8828 showed up starting
with this patch:
2002-02-12 Jakub Jelinek <jakub@redhat.com>
* jump.c (never_reached_warning): Add finish argument.
If finish is NULL, stop on CODE_LABEL, otherwise stop before
first
real insn after end.
* rtl.h (never_reached_warning): Adjust prototype.
* cse.c (cse_insn): Pass NULL as finish to
never_reached_warning.
* cfgrtl.c (flow_delete_block): Pass b->end as finish to
never_reached_warning.
Here's a small test case that causes the compiler to issue
warnings when compiled on i686-linux with -Wunreachable-code:
-------------------
/* incorrect(?) warnings with -Wunreachable-code */
void foo(int i) {
switch (i) {
case 0: break;
case 1: break;
};
};
-------------------
Output from mainline gcc:
8828.c: In function `foo':
8828.c:6: warning: will never be executed
8828.c:5: warning: will never be executed
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8828