[llvm-dev] Switching to Ninja

[Paul C. Anagnostopoulos via llvm-dev]

Sigh. I ask for your indulgence yet again.

I installed Ninja and deleted my old build tree. When I run CMake now, I'm told that it can't find the compilers and assembler. So, of course, I need to put a compiler toolset on my path. I tried MinGW but was instantly reminded that it doesn't have localtime_s. So I tried to find the Visual Studio binaries and located four different directories. I added what I thought was the correct one to my path. CMake found the compiler, but it failed to compile CMake's test.

Is anyone running Ninja with Visual Studio who might have a suggestion? I can't find anything in "Building LLVM with CMake."  I've attached the CMake output below.

At 8/8/2020 05:19 PM, David Blaikie wrote:
>Maybe? I'd usually delete my whole build directory (or create another)
>if I were switching that aspect - not sure if they'd effectively be
>able to reuse each others artefacts or would get in the way, etc.
>
>On Sat, Aug 8, 2020 at 2:12 PM Paul C. Anagnostopoulos via llvm-dev
><llvm-dev at lists.llvm.org> wrote:
>>
>> I built my first submission with Visual Studio, but everything I read and watch suggests Ninja, about which I know nothing. Is it okay if I rerun CMake with -G "Ninja" in the same build directory, then just run ninja?

----------------------------------------------
-- The C compiler identification is MSVC 19.26.28806.0
-- The CXX compiler identification is MSVC 19.26.28806.0
-- The ASM compiler identification is MSVC
-- Found assembler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.26.28801/bin/Host
x64/x64/cl.exe
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - failed
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.26.2
8801/bin/Hostx64/x64/cl.exe
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.26.2
8801/bin/Hostx64/x64/cl.exe - broken
CMake Error at C:/Program Files/CMake/share/cmake-3.18/Modules/CMakeTestCCompiler.cmake:66 (message):
  The C compiler

    "C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.26.28801/bin/Hostx64/x64/cl.exe"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: D:/LLVM/Build/CMakeFiles/CMakeTmp

    Run Build Command(s):C:/Utils/ninja.exe cmTC_009c0 && [1/2] Building C object CMakeFiles\cmTC_009c0.dir\testCCom
piler.c.obj
    [2/2] Linking C executable cmTC_009c0.exe
    FAILED: cmTC_009c0.exe
    cmd.exe /C "cd . && "C:\Program Files\CMake\bin\cmake.exe" -E vs_link_exe --intdir=CMakeFiles\cmTC_009c0.dir --r
c=rc --mt=CMAKE_MT-NOTFOUND --manifests  -- C:\PROGRA~2\MIB055~1\2019\COMMUN~1\VC\Tools\MSVC\1426~1.288\bin\Hostx64\
x64\link.exe /nologo CMakeFiles\cmTC_009c0.dir\testCCompiler.c.obj  /out:cmTC_009c0.exe /implib:cmTC_009c0.lib /pdb:
cmTC_009c0.pdb /version:0.0 /machine:x64  /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 ."
    RC Pass 1: command "rc /fo CMakeFiles\cmTC_009c0.dir/manifest.res CMakeFiles\cmTC_009c0.dir/manifest.rc" failed
(exit code 0) with the following output:
    The system cannot find the file specified
    ninja: build stopped: subcommand failed.

  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:49 (project)

-- Configuring incomplete, errors occurred!
See also "D:/LLVM/Build/CMakeFiles/CMakeOutput.log".
See also "D:/LLVM/Build/CMakeFiles/CMakeError.log".