Fortran Tests in the LLVM Test Suite¶
The LLVM Test Suite is a separate git repo from the main LLVM project. We recommend that first-time users read through LLVM Test Suite Guide which describes the organizational structure of the test suite and how to run it.
Fortran support can be enabled by setting the following CMake variables:
cmake -G "Ninja" -DCMAKE_C_COMPILER=<path to C compiler> \
-DCMAKE_CXX_COMPILER=<path to C++ compiler> \
-DCMAKE_Fortran_COMPILER=<path to Fortran compiler> \
-DTEST_SUITE_LIT=<path to llvm-lit> \
<path to llvm-test-suite>
This will configure the test-suite to run only the Fortran tests which
are found in the Fortran subdirectory. To run the C/C++ tests
alongside the Fortran tests omit the
If your Fortran compiler is Flang, there are a couple of other things you need to do, which are explained here.
Then to build and run the tests:
We recently added CMake hooks into the LLVM Test Suite to support Fortran tests from SPEC CPU 2017. We strongly encourage the use of the CMake Ninja (1.10 or later) generator due to better support for Fortran module dependency detection. Some of the SPEC CPU 2017 Fortran tests, those that are derived from climate codes, require support for little-endian/big-endian byte swapping capabilities which we automatically detect at CMake configuration time. Note that a copy of SPEC CPU 2017 must be purchased by your home institution and is not provided by LLVM.
Here is an example of how to build SPEC CPU 2017 with GCC
cmake -G "Ninja" -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ \
-DTEST_SUITE_SPEC2017_ROOT=<path to SPEC directory> ..
Tests from the gfortran test suite have been imported into the LLVM Test Suite.
The tests will be run automatically if the test suite is built following the
instructions described above.
There are additional configure-time options that can be used with the gfortran
tests. More details about those options and their purpose can be found in