libpgmath build fails on windows

[harishch4]

I'm following this link to build flang for windows and facing build issues during libpgmath build. Any idea on this?

cmake command:

C:\Users\hchambet\work\flang\runtime\libpgmath\build>cmake -DCMAKE_INSTALL_PREFIX=../install -DCMAKE_C_COMPILER="C:/Users/hchambet/work/classic-flang-llvm-project/install/bin/clang-cl.exe" -DCMAKE_CXX_COMPILER="C:/Users/hchambet/work/classic-flang-llvm-project/install/bin/clang-cl.exe" ..
-- Building for: Visual Studio 17 2022
-- Selecting Windows SDK version 10.0.22000.0 to target Windows 10.0.19045.
-- The C compiler identification is MSVC 19.36.32534.0
-- The CXX compiler identification is MSVC 19.36.32534.0
-- The ASM compiler identification is MSVC
-- Found assembler: C:/Program Files/Microsoft Visual Studio/2022/Professional/VC/Tools/MSVC/14.36.32532/bin/Hostx64/x64/cl.exe
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/Program Files/Microsoft Visual Studio/2022/Professional/VC/Tools/MSVC/14.36.32532/bin/Hostx64/x64/cl.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: C:/Program Files/Microsoft Visual Studio/2022/Professional/VC/Tools/MSVC/14.36.32532/bin/Hostx64/x64/cl.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found Python3: C:/Users/hchambet/AppData/Local/Programs/Python/Python311/python.exe (found version "3.11.3") found components: Interpreter
-- Looking for sqrt in m
-- Looking for sqrt in m - not found
-- Configuring done (12.0s)
-- Generating done (2.6s)
-- Build files have been written to: C:/Users/hchambet/work/flang/runtime/libpgmath/build

Errors:

[kaadam]

Hi, As far as I see the CMake hasn't picked up your clang-cl compiler setting, and cl.exe is used instead. CL is not supported in Flang project. CMake will select VS generator automatically in Windows platform, the VS generators don't use CMAKE_C/CXX_COMPILER variables. You should set the generator explicitly for example '-G Ninja' in command line to use clang-cl.

[harishch4]

You should set the generator explicitly for example '-G Ninja' in command line to use clang-cl.

After explicitly changing the generator, it is taking clang-cl as compiler but failing at a later point

C:\Users\hchambet\work\flang\runtime\libpgmath\build>"C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Auxiliary\Build\vcvarsall.bat" x64

---

** Visual Studio 2022 Developer Command Prompt v17.6.3
** Copyright (c) 2022 Microsoft Corporation

---

[vcvarsall.bat] Environment initialized for: 'x64'

C:\Users\hchambet\work\flang\runtime\libpgmath\build>cmake -G Ninja -DCMAKE_INSTALL_PREFIX=../install -DCMAKE_C_COMPILER="clang-cl.exe" -DCMAKE_CXX_COMPILER="clang-cl.exe" ..
-- The C compiler identification is Clang 15.0.1 with MSVC-like command-line
-- The CXX compiler identification is Clang 15.0.1 with MSVC-like command-line
-- The ASM compiler identification is Clang with MSVC-like command-line
-- Found assembler: C:/Program Files/Microsoft Visual Studio/2022/Professional/VC/Tools/Llvm/bin/clang-cl.exe
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - failed
-- Check for working C compiler: C:/Program Files/Microsoft Visual Studio/2022/Professional/VC/Tools/Llvm/x64/bin/clang-cl.exe
-- Check for working C compiler: C:/Program Files/Microsoft Visual Studio/2022/Professional/VC/Tools/Llvm/x64/bin/clang-cl.exe - broken
CMake Error at C:/Program Files/Microsoft Visual Studio/2022/Professional/Common7/IDE/CommonExtensions/Microsoft/CMake/CMake/share/cmake-3.26/Modules/CMakeTestCCompiler.cmake:67 (message):
The C compiler

"C:/Program Files/Microsoft Visual Studio/2022/Professional/VC/Tools/Llvm/x64/bin/clang-cl.exe"

is not able to compile a simple test program.

It fails with the following output:

Change Dir: C:/Users/hchambet/work/flang/runtime/libpgmath/build/CMakeFiles/CMakeScratch/TryCompile-sqlk3w

Run Build Command(s):C:/PROGRA~1/MIB055~1/2022/PROFES~1/Common7/IDE/COMMON~1/MICROS~1/CMake/Ninja/ninja.exe -v cmTC_cc701 && [1/2] C:\PROGRA~1\MIB055~1\2022\PROFES~1\VC\Tools\Llvm\x64\bin\clang-cl.exe  /nologo   /DWIN32 /D_WINDOWS /W3  /MDd /Zi /Ob0 /Od /RTC1 /showIncludes /FoCMakeFiles\cmTC_cc701.dir\testCCompiler.c.obj /FdCMakeFiles\cmTC_cc701.dir\ -c -- C:\Users\hchambet\work\flang\runtime\libpgmath\build\CMakeFiles\CMakeScratch\TryCompile-sqlk3w\testCCompiler.c
[2/2] cmd.exe /C "cd . && "C:\Program Files\Microsoft Visual Studio\2022\Professional\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\cmake.exe" -E vs_link_exe --intdir=CMakeFiles\cmTC_cc701.dir --rc=C:\PROGRA~1\MIB055~1\2022\PROFES~1\VC\Tools\Llvm\bin\llvm-rc.exe --mt=CMAKE_MT-NOTFOUND --manifests  -- C:\PROGRA~1\MIB055~1\2022\PROFES~1\VC\Tools\Llvm\bin\lld-link.exe /nologo CMakeFiles\cmTC_cc701.dir\testCCompiler.c.obj  /out:cmTC_cc701.exe /implib:cmTC_cc701.lib /pdb:cmTC_cc701.pdb /version:0.0 /machine:X86  /debug /INCREMENTAL /subsystem:console  kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib && cd ."
FAILED: cmTC_cc701.exe
cmd.exe /C "cd . && "C:\Program Files\Microsoft Visual Studio\2022\Professional\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\cmake.exe" -E vs_link_exe --intdir=CMakeFiles\cmTC_cc701.dir --rc=C:\PROGRA~1\MIB055~1\2022\PROFES~1\VC\Tools\Llvm\bin\llvm-rc.exe --mt=CMAKE_MT-NOTFOUND --manifests  -- C:\PROGRA~1\MIB055~1\2022\PROFES~1\VC\Tools\Llvm\bin\lld-link.exe /nologo CMakeFiles\cmTC_cc701.dir\testCCompiler.c.obj  /out:cmTC_cc701.exe /implib:cmTC_cc701.lib /pdb:cmTC_cc701.pdb /version:0.0 /machine:X86  /debug /INCREMENTAL /subsystem:console  kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib && cd ."
LINK Pass 1: command "C:\PROGRA~1\MIB055~1\2022\PROFES~1\VC\Tools\Llvm\bin\lld-link.exe /nologo CMakeFiles\cmTC_cc701.dir\testCCompiler.c.obj /out:cmTC_cc701.exe /implib:cmTC_cc701.lib /pdb:cmTC_cc701.pdb /version:0.0 /machine:X86 /debug /INCREMENTAL /subsystem:console kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib /MANIFEST /MANIFESTFILE:CMakeFiles\cmTC_cc701.dir/intermediate.manifest CMakeFiles\cmTC_cc701.dir/manifest.res" failed (exit code 1) with the following output:
lld-link: error: CMakeFiles\cmTC_cc701.dir\testCCompiler.c.obj: machine type x64 conflicts with x86
lld-link: error: could not open 'kernel32.lib': no such file or directory
lld-link: error: could not open 'user32.lib': no such file or directory
lld-link: error: could not open 'gdi32.lib': no such file or directory
lld-link: error: could not open 'winspool.lib': no such file or directory
lld-link: error: could not open 'shell32.lib': no such file or directory
lld-link: error: could not open 'ole32.lib': no such file or directory
lld-link: error: could not open 'oleaut32.lib': no such file or directory
lld-link: error: could not open 'uuid.lib': no such file or directory
lld-link: error: could not open 'comdlg32.lib': no such file or directory
lld-link: error: could not open 'advapi32.lib': no such file or directory
ninja: build stopped: subcommand failed.

CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:31 (project)

-- Configuring incomplete, errors occurred!

[kaadam]

It could be a native tools configuration issue, please make sure about you're using x64 native tools command prompt.
Please: https://github.com/flang-compiler/flang/wiki/Building-Flang-for-Windows#other-pre-requirement

[harishch4]

I'm using x64 Native Tools Command Prompt for VS 2022 to run all the commands. Still facing the issues.