Re: Linking external libraries
Re: Linking external libraries
- Subject: Re: Linking external libraries
- From: Sherm Pendley <email@hidden>
- Date: Sat, 11 Dec 2004 23:40:29 -0500
On Dec 11, 2004, at 11:15 PM, Michael Mulligan wrote:
This is kind of a silly question, but I just can't get the darn thing
to work and must be searching for the wrong thing in Google. I wrote a
simple test program (fftwTest.c) to ensure I knew how to use FFTW
correctly. I was able to build this using:
% gcc -lm -lfftw3 fftwTest.c
I then implemented what I needed in my xCode project, but now I don't
have a clue how to make things link properly. I thought I could just
click on my project (in the left), get info->Styles and add "fftw3" to
Header Search Paths (I also did this for the active target). When I
run my program though and attempt to run the FFTW-based code,
surprise!
ZeroLink: unknown symbol '_fftw_malloc'
Any suggestions to get the linking to work? Thanks in advance for any
assistance
Use Xcode's "Project/Add to Project ..." menu item to add the library
to your app - you're looking for a file that's named "libfftw3", with
an extension of "a" for a statically-linked library or "dylib" for a
dynamic library. If you built and installed it from source, it's
probably in /usr/local/lib/, if it came from Fink look in /sw/lib/.
That should take care of linking.
The "Header Search Paths" setting you mentioned tells the compiler to
search for headers when it finds an #include <foo.h>. Wherever you
found the library, add the matching include/ subdir to the header
search path - i.e. in the above examples it would be
/usr/local/include/ or /sw/include/, respectively.
sherm--
Cocoa programming in Perl: http://camelbones.sourceforge.net
Hire me! My resume: http://www.dot-app.org
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