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Re: pending/5051: May I ask a C Language problem?
- From: rodrigc at gcc dot gnu dot org
- To: nobody at gcc dot gnu dot org
- Cc: gcc-prs at gcc dot gnu dot org,
- Date: 9 Dec 2001 03:06:00 -0000
- Subject: Re: pending/5051: May I ask a C Language problem?
- Reply-to: rodrigc at gcc dot gnu dot org
The following reply was made to PR pending/5051; it has been noted by GNATS.
From: rodrigc@gcc.gnu.org
To: gcc-bugs@gcc.gnu.org, gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org,
nobody@gcc.gnu.org, s9322036@ncnu.edu.tw
Cc:
Subject: Re: pending/5051: May I ask a C Language problem?
Date: 9 Dec 2001 03:04:07 -0000
Synopsis: May I ask a C Language problem?
State-Changed-From-To: open->closed
State-Changed-By: rodrigc
State-Changed-When: Sat Dec 8 19:04:06 2001
State-Changed-Why:
Not a bug.
If I compile your code with:
gcc -Wall -pedantic test.c
r.c:8: warning: operation on `x' may be undefined
If I compile with the Digital Unix C++ compiler,
I get a larger warning:
cc: Warning: test.c, line 8: In this statement, the expression "printf(...)" modifies the variable "x" more than once without an intervening sequence point. This behavior is undefined. (undefvarmod)
printf ("%d\n", a (x));
What you are doing is undefined, so can differ between
compilers.
This is not a bug in gcc. Post your general C language questions
to the newsgroup comp.lang.c.moderated
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&pr=5051&database=gcc