Re: c/9862: spurious warnings with -W -O3 using gcc-3.2.2

Re: c/9862: spurious warnings with -W -O3 using gcc-3.2.2

[bangerth]

Synopsis: spurious warnings with -W -O3 using gcc-3.2.2

State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Wed Feb 26 17:31:46 2003
State-Changed-Why:
    Confirmed. -O3 is actually needed.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9862

c/9862: spurious warnings with -W -O3 using gcc-3.2.2

[Daniel Villeneuve]

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>Number:         9862
>Category:       c
>Synopsis:       spurious warnings with -W -O3 using gcc-3.2.2
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Feb 26 13:56:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Daniel Villeneuve
>Release:        3.2.2
>Organization:
Ad Opt Technologies Inc.
>Environment:
System: SunOS neuchatel 5.8 Generic_108528-17 sun4u sparc SUNW,Sun-Blade-100
Architecture: sun4

	
host: sparc-sun-solaris2.7
build: sparc-sun-solaris2.7
target: sparc-sun-solaris2.7
configured with: ./configure --prefix=/misc/ultra-sun-solaris2/gcc-3.2.2 --enable-threads=posix --disable-shared --disable-multilib
>Description:
  In the file <file.c> given below, the <trigger> function might return
  with or without a value.

  If compiling with -ansi -Wall -W -O3, the compiler warns about this,
  but also warns about the function <f> having the same problem,
  which is not the case.

<file.c>
extern int i;
extern int f(void);
extern int trigger(void);

int f(void)
{
  if( i ) return 0;
  else    return 1;
}

int trigger(void)
{
  if( i ) return;
  else    return 1;
}
</file.c>

>How-To-Repeat:
     gcc -ansi -Wall -W -O3 -c file.c
>Fix:


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>Release-Note:
>Audit-Trail:
>Unformatted: