Re: [Libevent-users] can libevent-devel for x86_64 and i686 coexist on a x86_64 machine?

[Nick Mathewson <nickm@xxxxxxxxxxxxx>]

On Tue, Nov 30, 2010 at 6:10 PM, Mr Dash Four
<mr.dash.four@xxxxxxxxxxxxxx> wrote:
>
>> That's plausible; packagers should probably indeed do something like
>> this; I hope that the package maintainer accepts it or something likes
>> it.
>>
>
> Tested it and it works to absolute perfection! I've done the changes exactly
> as I listed them in my previous post and have also created a small 'hello'
> program to test it:
>
> #include <stdio.h>
> #include <event-config.h>
>
> int main(void)
> {
>   printf("Size of long is %u\n",_EVENT_SIZEOF_LONG);
>   return 0;
> }
>
> [zeek@test1 ~]$ gcc -o hello hello.c
> [zeek@test1 ~]$ ./hello
> Size of long is 8
>
> [zeek@xp1 ~]$ gcc -o hello -m32 hello.c
> [zeek@xp1 ~]$ ./hello
> Size of long is 4
>
>
> So, it works. There is one thing I am not 100% sure though - at the very top
> of both -32 and -64 versions of event-config.h there is the following:
>
> /* event-config.h
> * Generated by autoconf; post-processed by libevent.
> * Do not edit this file.
> * Do not rely on macros in this file existing in later versions.
> */
>
>
> Does this mean that this file could be changed by autoconf then? Because if
> that is the case the new-look event-config.h will be absolutely screwed and
> there is no point on doing anything as the next time autoconf decides to
> change that file all will be lost and it will all be back to square one!

It's generated by autoconf *as part of the build process for
Libevent*.  If you build a new libevent with --prefix=/usr and do
"sudo make install" on it, then you will overwrite
/usr/include/event2/event-config.h.  But if you're using a packaging
system, then you shouldn't ever do that.

-- 
Nick
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