Linking Libraries in Xcode

Question

I\'m using a powerbook (osx 10.5) and recently downloaded and installed FFTW 3.2 (link text). I\'ve been able to compile and run some simple programs based on the online tut

Answer 1

To link to a .a library like this in Xcode you need to:

• Double-click on your target or application in Xcode to open the Info window

• Switch to the "Build" tab

• Add -lfftw3 to "Other Linker Flags" (under "Linking")

• Add the path to your library to the "Library Search Paths" (under "Search Paths"). In your case this will be /usr/local/lib

We use FFTW (it's great by the way), this works for us!

Answer 2

OK - I finally got this working. I also needed the the GNU Scientific Libraries and ran into similar issues with the architecture setting. For anyone interested, this tutorial goes through how to set up Xcode and link libraries:

https://web.archive.org/web/20101006023300/http://www.boyfarrell.com/learning-curve/gnu-scientific-library-and-xcode-31

Answer 3

warning in /Developer/SDKs/MacOSX10.5.sdk/usr/local/lib/libfftw3.a, file is not of required architecture

Maybe the binary format was different e.g. the library could be 32 bit while the application 64.

Answer 4

Did you set these options for the target?

Under "Linking->Other Linker Flags" add: "-L/path/to/library -lfftw3 -lm"