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* Re: c/8236: turning on optimization breaks preprocessor output
@ 2002-10-15 15:22 neil
0 siblings, 0 replies; 3+ messages in thread
From: neil @ 2002-10-15 15:22 UTC (permalink / raw)
To: gcc-bugs, gcc-prs, meshko, nobody
Synopsis: turning on optimization breaks preprocessor output
State-Changed-From-To: open->closed
State-Changed-By: neil
State-Changed-When: Tue Oct 15 15:22:27 2002
State-Changed-Why:
Not a bug. Macro arguments are determined before arguments
are macro-expanded. Glibc has a "feature" whereby if you
specify optimization to GCC, it "optimizes" various library
calls by making them into macros.
It is quite entitled to do this, and so the bug is in your
code.
You can work around it by defining a macro
#define my_strncmp(a, b, n) strncmp (a, b, n)
and this extra level of indirection will work provided
you use my_strncmp instead. Of course, this may introduce
other issues.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8236
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: c/8236: turning on optimization breaks preprocessor output
@ 2002-10-15 15:26 Neil Booth
0 siblings, 0 replies; 3+ messages in thread
From: Neil Booth @ 2002-10-15 15:26 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c/8236; it has been noted by GNATS.
From: Neil Booth <neil@daikokuya.co.uk>
To: neil@gcc.gnu.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
meshko@scorch2000.com, nobody@gcc.gnu.org, gcc-gnats@gcc.gnu.org
Cc:
Subject: Re: c/8236: turning on optimization breaks preprocessor output
Date: Tue, 15 Oct 2002 23:24:42 +0100
neil@gcc.gnu.org wrote:-
> Synopsis: turning on optimization breaks preprocessor output
>
> State-Changed-From-To: open->closed
> State-Changed-By: neil
> State-Changed-When: Tue Oct 15 15:22:27 2002
> State-Changed-Why:
> Not a bug. Macro arguments are determined before arguments
> are macro-expanded. Glibc has a "feature" whereby if you
> specify optimization to GCC, it "optimizes" various library
> calls by making them into macros.
>
> It is quite entitled to do this, and so the bug is in your
> code.
>
> You can work around it by defining a macro
>
> #define my_strncmp(a, b, n) strncmp (a, b, n)
Bah, make that
#define my_strncmp(a, b) strncmp (a, b)
Neil.
^ permalink raw reply [flat|nested] 3+ messages in thread
* c/8236: turning on optimization breaks preprocessor output
@ 2002-10-15 15:06 meshko
0 siblings, 0 replies; 3+ messages in thread
From: meshko @ 2002-10-15 15:06 UTC (permalink / raw)
To: gcc-gnats
>Number: 8236
>Category: c
>Synopsis: turning on optimization breaks preprocessor output
>Confidential: no
>Severity: critical
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue Oct 15 15:06:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: meshko@scorch2000.com
>Release: unknown-1.0
>Organization:
>Environment:
gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-98)
same happens on Red Hat 7.2 with gcc 2.96-110
does not happen of FreeBSD gcc 2.95.4
>Description:
gcc ob.c works,
but gcc -O ob.c gives:
ob.c:7:24: macro "strncmp" requires 3 arguments, but only 2 given.
When I run gcc -O -E ob.c the output contains line
strncmp;
so preprocessor already output incorrect result!
ob.c listing:
#define STC "blah", 5
#include <string.h>
main(int argc, char** argv)
{
strncmp(argv[1], STC);
}
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2002-10-15 22:26 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2002-10-15 15:22 c/8236: turning on optimization breaks preprocessor output neil
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2002-10-15 15:26 Neil Booth
2002-10-15 15:06 meshko
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