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Date: Mon, 22 Apr 2002 15:53:03 -0400
To: cygwin AT cygwin DOT com
From: "Larry Hall (RFK Partners, Inc)" <lhall AT rfk DOT com>
Subject: Re: Problems linking program
In-Reply-To: <3CC4671C.5070606@ece.gatech.edu>
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At 03:40 PM 4/22/2002, Charles Wilson wrote:
>Larry Hall (RFK Partners, Inc) wrote:
>
>>>        ld -shared -o libgd.so.2.0.0 gd.o gd_gd.o gd_gd2.o gd_io.o gd_io_dp.o
>>>gd_io_file.o gd_ss.o gd_io_ss.o gd_png.o gd_jpeg.o gdxpm.o   gdfontt.o gdfonts.o
>>>gdfontmb.o gdfontl.o gdfontg.o   gdtables.o gdft.o gdcache.o gdkanji.o wbmp.o
>>>gd_wbmp.o gdhelpers.o gd_topal.o -lfreetype -lgd -lz -ljpeg -lpng -lcygwin
>>>/usr/lib/libcygwin.a(_cygwin_crt0_common.o)(.text+0xe6): undefined reference to
>>>`GetModuleHandleA AT 4'
>
>>OK.  First, you shouldn't need to list -lcygwin.  It gets added automatically.
>>Fortunately now, it should be harmless to list it however.  That hasn't always
>>been the case so it's good not to get in the habit of adding it when it's not
>>needed.
>>'GetModuleHandle()' is a Win32 API.  You apparently have not installed the w32api package.  Rerun setup and do so.
>
>Nope -- the problem is he's using 'ld' directly to link the DLL.  Don't do that.  Instead of 'ld -shared', use 'gcc -shared'.  If you MUST pass linker specific options to ld, use '-Wl,--my-ld-option' in your gcc command line.


Ouch!  Chuck's right with this one.  I didn't pay attention to the link 
line, just the error.  Using 'ld' directly will not automatically pick 
up the w32api libraries, even if they are installed.  Use 'gcc' as Chuck
suggests.


>(BTW, naming your dll "foo.so.2.0.0" is a really bad idea.  Windows only supports shared libs that end in ".dll".)


Yeah, it still looks to me like Matt is trying to build the GNU C library
for some reason.  If it's to use with Cygwin, linking and correct naming
conventions for Windows will be the least of his problems! ;-)



Larry Hall                              lhall AT rfk DOT com
RFK Partners, Inc.                      http://www.rfk.com
838 Washington Street                   (508) 893-9779 - RFK Office
Holliston, MA 01746                     (508) 893-9889 - FAX


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