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[flang][docs] Update flang documentation regarding the test suite #80755

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Feb 8, 2024
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[flang][docs] Update flang documentation regarding the test suite #80755

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15 changes: 9 additions & 6 deletions flang/docs/FortranLLVMTestSuite.md
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Expand Up @@ -12,12 +12,6 @@ first-time users read through [LLVM Test Suite
Guide](https://llvm.org/docs/TestSuiteGuide.html) which describes the
organizational structure of the test suite and how to run it.

Although the Flang driver is unable to generate code at this time, we
are neverthelesss incrementally adding Fortran tests into the LLVM
Test Suite. We are currently testing against GFortran while we make
progress towards completing the new Flang driver with full
code-generation capabilities.

## Running the LLVM test-suite with Fortran

Fortran support can be enabled by setting the following CMake variables:
Expand Down Expand Up @@ -63,3 +57,12 @@ cmake -G "Ninja" -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ \
-DTEST_SUITE_FORTRAN:STRING=ON \
-DTEST_SUITE_SPEC2017_ROOT=<path to SPEC directory> ..
```

## Running the gfortran tests

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](#running-the-LLVM-test-suite-with-fortran).
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
[`Fortran/gfortran/README.md`](https://github.com/llvm/llvm-test-suite/tree/main/Fortran/gfortran/README.md)`.