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Date: Tue, 3 Jun 2008 08:49:51 -0500
From: "C S" <usmgoldeneagle AT gmail DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Cygwin - linker errors - __assert, __itob and __ftol
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my whole command line script is:

g++ -mno-cygwin -D__int64="long long" -Wl,-mno-cygwin -shared -I
"C:\Apps\Java\jdk1.6.0_05\include" -I
"C:\Apps\Java\jdk1.6.0_05\include\win32" -I "C:\Users\me\My
Documents\shapefiles\shapelib-1.2.10\shapelib-1.2.10" -I
"C:\Users\me\My Documents\shapefiles\shapelib128_bin_win" -L
"C:\Users\me\My Documents\shapefiles\shapelib128_bin_win" myFile.cpp
-o libShapeData.dll "C:\Users\me\My
Documents\shapefiles\shapelib128_bin_win\shpopen.obj" "C:\Users\me\My
Documents\shapefiles\shapelib128_bin_win\dbfopen.obj"

yeah i just typed in the 1 wrong. i am actually using an 'L'.

if i take the -Wl,-mno-cygwin option out then i get the following error(s):

-undefined reference to '_libmsvcrt_a_iname' along with other
.drective warnings for -defaultLib such as LIBC and OLDNAMES
-undefined reference to __nm___itob
Info: resolving __itob by linked to __imp___itob(auto-import)

thanks Dave K!





On Tue, Jun 3, 2008 at 8:33 AM, Dave Korn <dave DOT korn AT artimi DOT com> wrote:
> C S wrote on 03 June 2008 14:25:
>
>> Brian,
>>
>>  i figured out that not only do i need to compile against the
>> no-cygwin flag but also link to it as well. so i tried to add the -Wl
>> option like this:
>>
>> g++ -mno-cygwin -D__int64="long long" -W1-mno-cygwin
>
>  Ah, there's your problem.  You typed a '1' instead of an 'l'.  And you
> forgot the comma.
>
>  No, wait a minute, I was wrong.  The actual problem is that you aren't
> correctly describing what you've done.  Cut and paste stuff from your shell
> into your email, don't just make it up or you'll inevitably get it wrong.
>
>  Fortunately I can still tell what the actual error is:
>
>> the error i get now is:
>>
>> /usr/lib/gcc/i686-pc-mingw32/3.4.4../../../../i686-pc-mingw32/bin/ld:
>> unrecognized emulation mode: no-cygwin
>> Supported Emulations: i386pe
>> collect2: ld returned exit status
>>
>> at the prompt i did a ls /lib/gcc/i686-pc-mingw32 and it returned
>> 3.4.4 so that seems right.
>>
>> any clues or suggestions?? thanks all in advance!
>
>  It's not a linker option in that sense; you just need to make sure you've
> passed it to gcc or g++ along with all the .o files and it knows how to
> drive the linker from that.  So just remove your -Wl altogether; the plain
> old "-mno-cygwin" that you have immediately after the "g++" will do the job.
> The effect it has is to cause g++.exe to pass different -L options to ld.
>
>
>    cheers,
>      DaveK
> --
> Can't think of a witty .sigline today....
>
>
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