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<p class="MsoNormal">Hi Justin,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The flang script reads from standard input if a source file is not provided on the command line. It appears to hang, but it’s really just waiting for input.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Flang isn’t hooked up to a code generator yet, so instead, by default, flang generates another Fortran source file and tries to compile that file with a different compiler. The default is pgf90, but you can set the environment variable
F18_FC to be a different compiler, like gfortran.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The flang script that you are running is just a throwaway driver until the real driver is ready. That work is under development right now, but I don’t know when it will be ready. Until then, we have this quirky script that lets us test
flang semantics.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">- Steve<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">llvm-dev <llvm-dev-bounces@lists.llvm.org> on behalf of "Szaday, Justin Josef via llvm-dev" <llvm-dev@lists.llvm.org><br>
<b>Reply-To: </b>"Szaday, Justin Josef" <szaday2@illinois.edu><br>
<b>Date: </b>Wednesday, June 24, 2020 at 1:45 PM<br>
<b>To: </b>"llvm-dev@lists.llvm.org" <llvm-dev@lists.llvm.org><br>
<b>Subject: </b>[llvm-dev] [flang-dev] Difficulties with In-Tree Build of Flang<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:black">External email: Use caution opening links or attachments</span></b><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:black">
</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in">Hello all,<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">I am having a very difficult time getting in-tree builds of Flang working. My build commands are as follows:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">cmake -G Ninja -DLLVM_ENABLE_PROJECTS="flang" -DCMAKE_INSTALL_PREFIX=$(pwd) -DCMAKE_BUILD_TYPE=MinSizeRel ../llvm<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">cmake --build . --target check-flang<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">cmake --build . --target install<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">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.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">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.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">Thanks,<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">Justin<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"> <o:p></o:p></p>
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