Error when using gfortran on MacOS

Question

I mostly work on linux and have no problems but want to occasionally use a Mac for work. Somehow gfortran does not work there, though. I installed it as instructed but when I try to compile something, this happens:

gfortran -o m_g_matrix2.x m_g_matrix.f90
ld: entry point (start) undefined.  Usually in crt1.o for architecture x86_64
collect2: error: ld returned 1 exit status

I have no idea what this means and google search did not help. Did someone manage to get gfortran to work on Mac?

Thanks for the help!

From where did you install it? Which instructions did you use? Did you read the question about mac and gfortran from this site? There are many stackoverflow.com/questions/tagged/osx+gfortran — Vladimir F Героям слава
– Vladimir F Героям слава, Commented Oct 21, 2014 at 13:18
I read the questions and they do not answer mine. All I'm gathering is that people in general have problems compiling fortran on a Mac. It was a few months ago that I installed gfortran so I do not remember the exact way just that I needed Xcode for it — Mz_Chen
– Mz_Chen, Commented Oct 21, 2014 at 13:27
No, there have been no updates to the OS since then and it hasn't worked from the beginning. — Mz_Chen
– Mz_Chen, Commented Oct 21, 2014 at 14:15
Cannot reproduce -- gfortran built from source via macports, MacOS 10.10, 10.9 and 10.6. — casey
– casey, Commented Oct 21, 2014 at 15:09

JTNelson · Accepted Answer · 2015-01-01 19:19:08Z

1

I installed gcc binaries for yosemite from http://hpc.sourceforge.net and also installed Xcode command-line tools as directed there. gcc contains the gfortran compiler. Seems to work well on macbook air with Yosemite. JTN

answered Jan 1, 2015 at 19:19

JTNelson

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