Re: Problems linking program

[Charles Wilson <cwilson at ece dot gatech dot edu>]

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@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.

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

--Chuck


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