CODEWITHSUNDEEP
bashcompilationfortranfftw
SSC Napoli
SSC Napoli

Reputation: 141

compile FFTW fortran program

I'm quite new to Unix and bash systems, therefore i'm sorry in advance if the question might look stupid.

I've recently downloaded and installed the FFTW program on my iMac (following the guidelines in chapter 10 of http://www.fftw.org/fftw3.pdf). The installation has succeeded as i get no error when i do "make check".

Now i wanted to start writing a small test program using the above mentioned libraries.

The fortran code is very simple (and it is basically just a check of how to link the FFTW libraries to fortran):

program fft

use, intrinsic :: iso_c_binding
include 'fftw3.f03'

implicit none

end program fft

however when it comes to compile the program i'm completely clueless (basically because i'm not expert at all in compiling) what i typically do to compile is:

gfortran -o "executable_ename"  "main.f90"

However this is not working, in particular i get the following error:

 fft.f90:4: Error: Can't open included file 'fftw3.f03'

If you could give me a hand with this problem, and maybe also explain what i'm missing and why it would be great.

Upvotes: 3

Views: 6272

Answers (2)

Alexander Vogt
Alexander Vogt

Reputation: 18118

You need to specify where fftw3.f03 is located! On my machine, it is in /usr/include, so I use:

gfortran -I/usr/include -o "executable_ename" main.f90

BTW: the implicit none must go in front of the include:

program fft
  use, intrinsic :: iso_c_binding
  implicit none

  include 'fftw3.f03'
end program fft

Upvotes: 5

user4490638
user4490638

Reputation:

You need to be sure that the directory which contains fftw03.f03 is in the compiler's search list for include files.

Locate that directory (let's say it is in /foo/bar), then use

gfortran -I /foo/bar -o executable_name main.f90

Upvotes: 0

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