===== Fortran =====



=== Fortran ABI Mismatch ===

The two most popular open source fortran compilers are **g77** and **gfortran**. Unfortunately, they are **not ABI compatible**, which means that concretely you should avoid mixing libraries built with one with another.


You can check which fortran compiler was used by looking at the dependencies a library was build with:

<code bash>
ldd /usr/lib64/libblas.so
</code>

If there is a dependency <code>libgfortran.so.3 => ...</code> **gfortran** was used.
If a dependency is <code>libg2c.so => ...</code> the **g77** was used.