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[flang][test-suite] Document need for NO_STOP_MESSAGE environment variable. NFC 

When running the llvm-test-suite with flang, we get a lot of failures
because of the output of the `STOP` statement. We can workaround them by
setting `NO_STOP_MESSAGE=1` in the environment. This patch adds a few
words about it to the docs about the Fortran part of the llvm-test-suite.

See also https://reviews.llvm.org/D126360
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Diana Picus 2022-05-25 08:42:38 +00:00
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flang/docs/FortranLLVMTestSuite.md
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@ -34,6 +34,10 @@ are found in the Fortran subdirectory. To run the C/C++ tests
alongside the Fortran tests omit the `-DTEST_SUITE_SUBDIRS` CMake
variable.
If your Fortran compiler is Flang, you may want to set the `NO_STOP_MESSAGE`
environment variable to `1` in order to avoid test failures due to warnings
about INEXACT signaling exceptions.
## Running the SPEC CPU 2017