Re: Library Link order, cygwin, AC_TRY_LINK

[Christopher B Egner]

> I do have one library (bzip2 library) that fails to find an existing 
> library function under MinGW but otherwise I have not encountered 
> any configure problems under Cygwin and MinGW.

Hrmm.  I was hoping this would be a well known issue that somehow 
escaped documentation.  :o/

> I have not updated my Cygwin environment for quite a while.  It may 
> be that there is some new Cygwin linker bug which is causing the 
> problem.
> Or perhaps, libreadline is dependent on some other library and the 
> linker is handling the error wrong.

I checked into that, hoping that might be it...

address@hidden /tmp$ gcc -o conftest.exe  -I/usr/include -I/usr/include 
-I/usr/include    -lreadline  rl_test.c
/cygdrive/c/DOCUME~1/egner2/LOCALS~1/Temp/ccb1Czwp.o(.text+0x2e):rl_test.c: 
undefined reference to `_readline'
collect2: ld returned 1 exit status

address@hidden /tmp$ gcc -o conftest.exe  -I/usr/include -I/usr/include 
-I/usr/include    rl_test.c -lreadline

address@hidden /tmp
$

As you can see, inverting the source file and the library does the trick.

For the curious, rl_test.c is:

#include <stdio.h>
#include <readline/readline.h>
#include <readline/history.h>

int
main( int argc, char** argv )
{
        readline( "prompt>" );
        exit( 0 );
}

--EOF--

Thanks, though.  Hopefully someone else has run into this before.

Chris Egner