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Re: g++ Warning Incorrect?


On Fri, 29 Aug 2003, Chip Cuntz wrote:

This is a mailing list for the discussion of gcc and its internals, not
for help with programming in the C programming language.

You should ask these questions in the comp.lang.c Usenet newsgroup.

Toshi

> In the following function line 8 fails with compiler warning below. If I change the 0x00 to 0x01 it compiles without warning (but incorrect logic).
> 
> Bug or ingnorance?  Can someone provide the third eye here!
> 
> ...
> 
> 1  //
> 2  // Function:     hex2chr();
> 3  //
> 4  char hex2chr( char chr )
> 5  {
> 6
> 7    if( chr >= 0x0A && chr <= 0x0F ) return chr += 0x37;
> 8    if( chr >= 0x00 && chr <= 0x09 ) return chr += 0x30;
> 9 
> 10   return 0;
> 11
> 12 }
> 
> From gvim:
> 
> :!make  2>&1| tee /tmp/v207887/27
> ncidView.C: In function `char hex2chr(char)':
> ncidView.C:8: warning: comparison is always true due to limited range of data
>    type
> 
> GCC Version:
> 
> Reading specs from /usr/local/lib/gcc-lib/rs6000-ibm-aix4.3.3.0/3.2.2/specs
> Configured with: configure --enable-languages=c,c++
> Thread model: aix
> gcc version 3.2.2


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