Re: [hpoj-devel] new "ptal-mlcd" I/O driver checked into CVS

[Joe P. <joe...@sn...>]

On Monday 12 March 2001 03:12 am, David Paschal wrote:

> Remind me again which version of RedHat you're using?  Are these the stock
> versions of glibc and gcc that came with this version?

I'm using a RedHat 6.1 system, but I built the compiler (gcc 2.95.2) from 
source. The glibc version (2.1.3-22) is the redhat-supplied rpm update that I 
installed because of the reported security vulnerability in earlier packages. 
I wouldn't go back to an earlier version.

My system doesn't seem to be broken. I've been building Qt and KDE2 from 
source, as well as many C-only apps.


> > A suggested fix is to "change '::' to ' : : ' in
> > sys/io.h" .
>
> Does that work?  Of course, that isn't a proper solution, since I don't
> want people to have to hack system include files in order to build hpoj.

I don't know. I didn't try it, though I will if I need to. The comments I 
found were from gcc, glibc or redhat development mailing lists, so they may 
not be useful advice for many other people.  

>
> I'm wondering if this problem only affects C++ and not C code.  Could you
> please try writing a simple "hello world" program compiled as C (not C++),
> and include this file?  If it works OK for C code, then perhaps I could add
> a small C wrapper for the in/out functions to avoid including this file in
> a C++ file.  Of course, it wouldn't be good for performance, since those
> functions would no longer be inlined.


I tried to compile a file containing the code below calling both gcc and g++ 
as the compiler. The filename ending was '.c' in both cases. gcc had no 
trouble compiling it, but when I attempted to compile it with g++, it barfed 
(possibly on the '::') causing the same errors I reported earlier.

If  the file is resaved with a .cpp suffix and gcc is called to compile it, 
it barfs.


/*
filename: test_including_io_h.c
*/
#include </usr/include/sys/io.h>
#include <stdio.h>

int main(){
        printf("Hello World\n");
        exit(0);
}


Here is the output when attempting to compile the above code with g++.

]$ g++ -o test_including_io_h test_including_io_h.c
In file included from test_including_io_h.c:4:
/usr/include/sys/io.h: In function `void outb(unsigned char, short unsigned 
int)':
/usr/include/sys/io.h:98: parse error before `::'
/usr/include/sys/io.h: In function `void outb_p(unsigned char, short unsigned 
int)':
/usr/include/sys/io.h:104: parse error before `::'
/usr/include/sys/io.h: In function `void outw(short unsigned int, short 
unsigned int)':
/usr/include/sys/io.h:111: parse error before `::'
/usr/include/sys/io.h: In function `void outw_p(short unsigned int, short 
unsigned int)':
/usr/include/sys/io.h:118: parse error before `::'
/usr/include/sys/io.h: In function `void outl(unsigned int, short unsigned 
int)':
/usr/include/sys/io.h:125: parse error before `::'
/usr/include/sys/io.h: In function `void outl_p(unsigned int, short unsigned 
int)':
/usr/include/sys/io.h:131: parse error before `::'

-- 
Joe