Re: optimization/7189: gcc -O2 -Wall does not print ``controlreaches end of non-void function'' warning

[Steven Bosscher <s dot bosscher at student dot tudelft dot nl>]

The following reply was made to PR optimization/7189; it has been noted by GNATS.

From: Steven Bosscher <s.bosscher@student.tudelft.nl>
To: gcc-gnats@gcc.gnu.org, am99173@konami.com, gcc-bugs@gcc.gnu.org,
	nobody@gcc.gnu.org
Cc:  
Subject: Re: optimization/7189: gcc -O2 -Wall does not print ``control
	reaches end of non-void function'' warning
Date: 13 Feb 2003 16:33:14 +0100

 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7189
 
 This is a sibling call optimization bug.
 
 Without any optimization (gcc -c -Wall), the warning is issued
 as it should be.  When sibling calls are optimized
 (gcc -c -Wall -foptimize-sibling-calls), the warning disappears.
 
 # cat c7129.c
 extern void foo(void);
 int bar(void) { foo(); }
 
 # gcc-3.4 -v
 Reading specs from
 /opt/experimental/lib/gcc-lib/i586-pc-linux-gnu/3.4/specs
 Configured with: ../gcc-trunk/configure --disable-nls --with-gnu-as
 --with-gnu-ld --prefix=/opt/experimental --program-suffix=-3.5
 --enable-languages=c,c++
 Thread model: posix
 gcc version 3.4 20030213 (experimental)
 # gcc-3.4 -c -Wall c7189.c                            
 c7189.c: In function `bar':
 c7189.c:2: warning: control reaches end of non-void function
 # gcc-3.4 -c -Wall c7189.c -foptimize-sibling-calls
 # 
 
 Greetz
 Steven