llvm dev - Jun 2020 - [flang-dev] Difficulties with In-Tree Build of Flang

Hello all,

I am having a very difficult time getting in-tree builds of Flang working. My
build commands are as follows:
cmake -G Ninja -DLLVM_ENABLE_PROJECTS="flang"
-DCMAKE_INSTALL_PREFIX=$(pwd) -DCMAKE_BUILD_TYPE=MinSizeRel ../llvm
cmake --build . --target check-flang
cmake --build . --target install

The build itself completes successfully, and all the Flang tests pass when using
“check-flang”; however, “flang -v” and “flang -h” hang (it does not produce any
output and has to be killed) and, when trying to compile a program, I get the
error message “execvp(pgf90) failed: No such file or directory” (which fails
even if I set F18_FC to gfortran or flang). I have tried building it on a few
machines to no avail. I have tested both the Debug and MinSizeRel build types,
used both Ninja and Unix Makefiles to build it, and tested a few different
versions of GCC/G++, ultimately settling on v9.1.0. I am building from master of
the llvm-project GitHub repository.

Any insights here would be appreciated, I am at a loss about what else to try
here. Any other debugging suggestions or usage tips would be appreciated as
well.

Thanks,
Justin

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