gfortran_for_abaqus

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gfortran_for_abaqus

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Configuration of the GFortran compiler to use it with Abaqus

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// repository documentation

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# Configuration of the GFortran compiler to use it with Abaqus
To use [GNU Fortran Compiler](https://gcc.gnu.org/fortran/) with Abaqus the compiler and linker options in Abaqus config file must be modified. The following statements added to global (`lnx86_64.env`) or local (`abaqus_v6.env`) Abaqus configuration files enables to compile and to link Abaqus user subroutines on Linux using GFortran:

```
import os

abaHomeInc = os.path.abspath(os.path.join(os.environ.get('ABA_HOME', ''), os.pardir))

fortCmd = "gfortran"

compile_fortran = [fortCmd,
                   '-c', '-cpp', '-fPIC','-extend-source',
                   '-DABQ_LNX86_64', '-DABQ_FORTRAN',
                   '-fautomatic',
                   '-mno-fma', 
                   '-fprotect-parens',
                   '-fstack-protector-strong',
                   '-msse3',
                   '-mavx', '-mavx2',
                   '-ffixed-line-length-none',
                   '-I%I', '-I'+abaHomeInc, '%P']

link_sl = [fortCmd,
           '-fPIC', '-shared','-Wl,--add-needed', 
           '%E', '-Wl,-soname,%U', '-o', '%U', '%F', '%A', '%L', '%B',
           '-Wl,-Bdynamic']

link_exe = [fortCmd,
            '-fPIC',
            '-Wl,-Bdynamic', '-Wl,--add-needed', '-o', '%J', '%F', '%M', '%L', '%B', '%O']

del fortCmd
del abaHomeInc
```

To debug a subroutine, it must be compiled with `-g` option to produce debugging information. In the case of GDB you can use `-ggdb3` to produce debugging information for use by GDB specifically. It can be done by modifying Abaqus environment variable `compile_fortran` in Abaqus environment file:
```
compile_fortran=compile_fortran + ['-ggdb3', '-std=legacy', '-fcheck=all', '-fbacktrace', '-static']
```
More about debugging Abaqus usersubroutines on Linux can be found [here](https://www.linkedin.com/pulse/debugger-abaqus-user-subroutines-marcin-wierszycki).

The easiest way to set it up is to put the provided [here](abaqus_v6.env) `abaqus_v6.env` file to your home directory or directory where you run Abaqus with subroutines. If you have `abaqus_v6.env` already, copy the statements which define and delete variables to your `abaqus_v6.env` file.

To check if it works correctly run the command:
```
$ abaqus verify user_std user_exp make

------------------------------------------------------------

Abaqus Product Verification

Mon 17 Jan 2022 10:11:25 PM CET

------------------------------------------------------------

Verify test : Abaqus/Standard with user subroutines verification

result : PASS

------------------------------------------------------------

Verify test : Abaqus/Explicit with user subroutines verification

- 'Abaqus/Explicit single precision user subroutine' completed, validation Succeeded

- 'Abaqus/Explicit double precision user subroutine' completed, validation Succeeded

result : PASS

------------------------------------------------------------

Verify test : Abaqus make utility verification

- 'Abaqus make C++ verification' completed, validation Succeeded

- 'Abaqus make C++ PostProcess Application' completed, validation Succeeded

- 'Abaqus make Fortran verification' completed, validation Succeeded

- 'Abaqus make Fortran PostProcess Application' completed, validation Succeeded

- 'Abaqus make object file verification' completed, validation Succeeded

- 'Abaqus make object file PostProcess Application' completed, validation Succeeded

result : PASS

------------------------------------------------------------

Verification procedure complete

Mon 17 Jan 2022 10:11:54 PM CET

------------------------------------------------------------

```

Happy coding!

# References:
1. [The GNU Fortran Compiler](https://gcc.gnu.org/fortran/)
2. [A GNU Manual](https://gcc.gnu.org/onlinedocs/)
3. [Using GNU Fortran](https://gcc.gnu.org/onlinedocs/gcc-4.8.5/gfortran.pdf)

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