Re: [opendx-dev] AAARRRGGGHHH!! byte not signed?

[Marcus H. Mendenhall]

Hmmm. this surprises me.  Maybe I did define it somewhere.  Many 
./configure systems print a line about whether -fsigned-char is 
needed (for example, the lesstif configure), and I may not have 
noticed that DX wasn't doing it.

There is no logic to add this -fsigned-char during configure. You 
must have had it defined in an environment variable somewhere. I 
guess I've never noticed this. Are there other platforms that you 
know of that do this? Is this something we should definitely be 
adding a configure check for?

David

Building many packages on LinuxPPC requires -fsigned-char in the 
gcc options, to make the behavior consistent with Linux-x86.  The 
ANSI standard does not specify either way the default behavior, and 
for some inscrutable reason, the PPC gcc chose the opposite 
convention as x86. I think programs are supposed to specify signed 
or unsigned if they really care, but most code assumes signed is 
the default.

The configure system for dx did this (automatically inserted 
-fsigned-char) correctly on my LinuxPPC system, though.  Is there 
some stuff in dx being built without this string?

Marcus Mendenhall

Cleaning a few things up lately, I just found out that on my 
LinuxPPC installation, char and signed char are different i.e. 
char is unsigned char. Is this the same case for Linux Intel? 
Could someone run the test:

#include <stdio.h>

int main() {

        char a = -3;
        if(a > 0)
                printf("Ooops!\n");
        return 0;
}

And let me know? If I change the char to signed char above then it 
works as expected.

David
--
................................................................... 
..........
David L. Thompson                          The University of Montana
mailto:[EMAIL PROTECTED]                 Computer Science Department
http://www.cs.umt.edu/u/dthompsn           Missoula, MT  59812
                                        Work Phone : (406)257-8530

--
.............................................................................
David L. Thompson                          The University of Montana
mailto:[EMAIL PROTECTED]                 Computer Science Department
http://www.cs.umt.edu/u/dthompsn           Missoula, MT  59812
                                          Work Phone : (406)257-8530