[Monetdb-developers] Linking against a library
Hi,
My first module (called "geom"), created from "template", compiles (on
Windows XP with the "native tools") and the hello() function works.
Now I want to use some functions of a certain library (the
GEOShttp://geos.refractions.netC API). I'm fairly new to C, so
probably I'm doing something obvious wrong.
What I have is a header file
"geos_c.hhttp://geos.refractions.net/ro/doxygen_docs/html/geos__c_8h-source.html"
and a DLL "geos_c_fw.dll" (I chose to use a prebuilt DLL for now, since I
didn't manage to build the GEOS library as well :-(.)
I put those in the NT directory.
In my geom.mx, I added:
*#include*
On Mon, Oct 09, 2006 at 04:32:54PM +0200, Wouter Scherphof wrote:
Hi,
My first module (called "geom"), created from "template", compiles (on Windows XP with the "native tools") and the hello() function works.
Now I want to use some functions of a certain library (the GEOShttp://geos.refractions.netC API). I'm fairly new to C, so probably I'm doing something obvious wrong.
What I have is a header file "geos_c.hhttp://geos.refractions.net/ro/doxygen_docs/html/geos__c_8h-source.html"
On windows you need a file geos_c_fw.lib during the linking phase. The dlls are used during runtime. Niels
and a DLL "geos_c_fw.dll" (I chose to use a prebuilt DLL for now, since I didn't manage to build the GEOS library as well :-(.) I put those in the NT directory.
In my geom.mx, I added: *#include*
* **int* testGeos( ){* * initGEOS(*NULL*,*NULL*);* * finishGEOS();* ** return* GDK_SUCCEED;* *} Now, when I run "nmake NEED_MX=1", I get: (...) cl -GF -W3 -wd4273 -wd4102 -MD -nologo -Zi -Ox -I. -I.\.. "-IC:\Pthreads\include" -I.\..\..\src "-IC:\monetdb\MonetDB\NT\include" "-IC:\monetd b\MonetDB\NT\include\common" "-IC:\monetdb\MonetDB\NT\include\gdk" "-IC:\monetdb\MonetDB\NT\include\monet" "-IC:\monetdb\MonetDB\NT\include\plain" "-I C:\monetdb\MonetDB\NT\include\mapi" -DNDEBUG -DLIBGEOM -DCOMPILE_DL_GEOM -Fo"geom.obj" -c "geom.c" geom.c cl -GF -W3 -wd4273 -wd4102 -MD -nologo -Zi -Ox -I. -I.\.. "-IC:\Pthreads\include" -I.\..\..\src "-IC:\monetdb\MonetDB\NT\include" "-IC:\monetd b\MonetDB\NT\include\common" "-IC:\monetdb\MonetDB\NT\include\gdk" "-IC:\monetdb\MonetDB\NT\include\monet" "-IC:\monetdb\MonetDB\NT\include\plain" "-I C:\monetdb\MonetDB\NT\include\mapi" -DNDEBUG -LD -Felib_geom.dll geom.glue.obj geom.obj /link "/LIBPATH:C:\monetdb\MonetDB\NT\lib" "/LIBPATH:C:\monet db\MonetDB\NT\lib\MonetDB" libbat.lib libmonet.lib Creating library lib_geom.lib and object lib_geom.exp geom.obj : error LNK2019: unresolved external symbol _finishGEOS referenced in function _testGeos geom.obj : error LNK2019: unresolved external symbol _initGEOS referenced in function _testGeos lib_geom.dll : fatal error LNK1120: 2 unresolved externals So the compilation of geom.c succeeds, but the linking of lib_geom.dll fails. Apperently, the geos_c_fw.dll is not found. I tried putting it in one of the /LIBPATH, but that doesn't help.
How can I make this work?
Best regards, Wouter Scherphof.
Utrecht Professional School, The Netherlands.
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-- Niels Nes, Centre for Mathematics and Computer Science (CWI) Kruislaan 413, 1098 SJ Amsterdam, The Netherlands room C0.02, phone ++31 20 592-4098, fax ++31 20 592-4312 url: http://www.cwi.nl/~niels e-mail: Niels.Nes@cwi.nl
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Niels Nes -
Wouter Scherphof