"Unable to automatically determine compiler" message on configure/build

Brief Issue Summary

When configuring or building a simple project using CMake Tools, the message

[rollbar] Unable to automatically determine compiler

appears many times in the output.

CMake Tools Log

[cms-client] Configuring using the "Visual Studio 15 2017" CMake generator
[cms-client] Configuring using the "Visual Studio 15 2017" CMake generator
[cmake] The C compiler identification is MSVC 19.14.26433.0
[cmake] The CXX compiler identification is MSVC 19.14.26433.0
[cmake] Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.14.26428/bin/Hostx86/x64/cl.exe
[cmake] Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.14.26428/bin/Hostx86/x64/cl.exe -- works
[cmake] Detecting C compiler ABI info
[cmake] Detecting C compiler ABI info - done
[cmake] Detecting C compile features
[cmake] Detecting C compile features - done
[cmake] Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.14.26428/bin/Hostx86/x64/cl.exe
[cmake] Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.14.26428/bin/Hostx86/x64/cl.exe -- works
[cmake] Detecting CXX compiler ABI info
[cmake] Detecting CXX compiler ABI info - done
[cmake] Detecting CXX compile features
[cmake] Detecting CXX compile features - done
[cmake] Configuring done
[cmake] Generating done
[cmake] CMake Warning:
[cmake]   Manually-specified variables were not used by the project:
[cmake] 
[cmake]     CMAKE_EXPORT_COMPILE_COMMANDS
[cmake] 
[cmake] 
[rollbar] Unable to automatically determine compiler {"lang":"CXX","fileGroup":{"isGenerated":true,"sources":["build/CMakeFiles/97dc947cd7023b12d597309df2d3148e/generate.stamp.rule"]}}
[rollbar] Unable to automatically determine compiler {"lang":"C","fileGroup":{"compileFlags":"/DWIN32 /D_WINDOWS /W3 /MDd /Zi /Ob0 /Od /RTC1  ","isGenerated":false,"language":"C","sources":["main.c"]}}
[rollbar] Unable to automatically determine compiler {"lang":"CXX","fileGroup":{"isGenerated":true,"sources":["build/CMakeFiles/97dc947cd7023b12d597309df2d3148e/generate.stamp.rule"]}}
[rollbar] Unable to automatically determine compiler {"lang":"C","fileGroup":{"compileFlags":"/DWIN32 /D_WINDOWS /W3 /MD /O2 /Ob2 /DNDEBUG  ","isGenerated":false,"language":"C","sources":["main.c"]}}
[rollbar] Unable to automatically determine compiler {"lang":"CXX","fileGroup":{"isGenerated":true,"sources":["build/CMakeFiles/97dc947cd7023b12d597309df2d3148e/generate.stamp.rule"]}}
[rollbar] Unable to automatically determine compiler {"lang":"C","fileGroup":{"compileFlags":"/DWIN32 /D_WINDOWS /W3 /MD /O1 /Ob1 /DNDEBUG  ","isGenerated":false,"language":"C","sources":["main.c"]}}
[rollbar] Unable to automatically determine compiler {"lang":"CXX","fileGroup":{"isGenerated":true,"sources":["build/CMakeFiles/97dc947cd7023b12d597309df2d3148e/generate.stamp.rule"]}}
[rollbar] Unable to automatically determine compiler {"lang":"C","fileGroup":{"compileFlags":"/DWIN32 /D_WINDOWS /W3 /MD /Zi /O2 /Ob1 /DNDEBUG  ","isGenerated":false,"language":"C","sources":["main.c"]}}

And if I build the project:

[build] Starting build
[proc] Executing command: "C:\Program Files\CMake\bin\cmake.EXE" --build c:/example/build --config Debug --target example -- /m /property:GenerateFullPaths=true
[build] Microsoft (R) Build Engine version 15.7.180.61344 for .NET Framework
[build] Copyright (C) Microsoft Corporation. All rights reserved.
[build] 
[build] Build started 22/07/2018 17:16:48.
[build]      1>Project "C:\example\build\example.vcxproj" on node 1 (default targets).
[build]      1>Project "C:\example\build\example.vcxproj" (1) is building "C:\example\build\ZERO_CHECK.vcxproj" (2) on node 1 (default targets).
[build]      2>PrepareForBuild:
[build]          Creating directory "x64\Debug\ZERO_CHECK\".
[build]          Creating directory "x64\Debug\ZERO_CHECK\ZERO_CHECK.tlog\".
[build]        InitializeBuildStatus:
[build]          Creating "x64\Debug\ZERO_CHECK\ZERO_CHECK.tlog\unsuccessfulbuild" because "AlwaysCreate" was specified.
[build]        CustomBuild:
[build]          Checking Build System
[build]          CMake does not need to re-run because C:/example/build/CMakeFiles/generate.stamp is up-to-date.
[build]        FinalizeBuildStatus:
[build]          Deleting file "x64\Debug\ZERO_CHECK\ZERO_CHECK.tlog\unsuccessfulbuild".
[build]          Touching "x64\Debug\ZERO_CHECK\ZERO_CHECK.tlog\ZERO_CHECK.lastbuildstate".
[build]      2>Done Building Project "C:\example\build\ZERO_CHECK.vcxproj" (default targets).
[build]      1>PrepareForBuild:
[build]          Creating directory "example.dir\Debug\".
[build]          Creating directory "C:\example\build\Debug\".
[build]          Creating directory "example.dir\Debug\example.tlog\".
[build]        InitializeBuildStatus:
[build]          Creating "example.dir\Debug\example.tlog\unsuccessfulbuild" because "AlwaysCreate" was specified.
[build]        CustomBuild:
[build]          Building Custom Rule C:/example/CMakeLists.txt
[build]          CMake does not need to re-run because C:/example/build/CMakeFiles/generate.stamp is up-to-date.
[build]        ClCompile:
[build]          C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.14.26428\bin\HostX86\x64\CL.exe /c /Zi /nologo /W3 /WX- /diagnostics:classic /Od /Ob0 /D WIN32 /D _WINDOWS /D "CMAKE_INTDIR=\"Debug\"" /D _MBCS /Gm- /RTC1 /MDd /GS /fp:precise /Zc:wchar_t /Zc:forScope /Zc:inline /Fo"example.dir\Debug\\" /Fd"example.dir\Debug\vc141.pdb" /Gd /TC /FC /errorReport:queue C:\example\main.c
[build]          main.c
[build]        Link:
[build]          C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.14.26428\bin\HostX86\x64\link.exe /ERRORREPORT:QUEUE /OUT:"C:\example\build\Debug\example.exe" /INCREMENTAL /NOLOGO kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib /MANIFEST /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /manifest:embed /DEBUG /PDB:"C:/example/build/Debug/example.pdb" /SUBSYSTEM:CONSOLE /TLBID:1 /DYNAMICBASE /NXCOMPAT /IMPLIB:"C:/example/build/Debug/example.lib" /MACHINE:X64  /machine:x64 example.dir\Debug\main.obj
[build]          example.vcxproj -> C:\example\build\Debug\example.exe
[build]        FinalizeBuildStatus:
[build]          Deleting file "example.dir\Debug\example.tlog\unsuccessfulbuild".
[build]          Touching "example.dir\Debug\example.tlog\example.lastbuildstate".
[build]      1>Done Building Project "C:\example\build\example.vcxproj" (default targets).
[build] 
[build] Build succeeded.
[build]     0 Warning(s)
[build]     0 Error(s)
[build] 
[build] Time Elapsed 00:00:02.13
[build] Build finished with exit code 0
[rollbar] Unable to automatically determine compiler {"lang":"CXX","fileGroup":{"isGenerated":true,"sources":["build/CMakeFiles/97dc947cd7023b12d597309df2d3148e/generate.stamp.rule"]}}
[rollbar] Unable to automatically determine compiler {"lang":"C","fileGroup":{"compileFlags":"/DWIN32 /D_WINDOWS /W3 /MDd /Zi /Ob0 /Od /RTC1  ","isGenerated":false,"language":"C","sources":["main.c"]}}
[rollbar] Unable to automatically determine compiler {"lang":"CXX","fileGroup":{"isGenerated":true,"sources":["build/CMakeFiles/97dc947cd7023b12d597309df2d3148e/generate.stamp.rule"]}}
[rollbar] Unable to automatically determine compiler {"lang":"C","fileGroup":{"compileFlags":"/DWIN32 /D_WINDOWS /W3 /MD /O2 /Ob2 /DNDEBUG  ","isGenerated":false,"language":"C","sources":["main.c"]}}
[rollbar] Unable to automatically determine compiler {"lang":"CXX","fileGroup":{"isGenerated":true,"sources":["build/CMakeFiles/97dc947cd7023b12d597309df2d3148e/generate.stamp.rule"]}}
[rollbar] Unable to automatically determine compiler {"lang":"C","fileGroup":{"compileFlags":"/DWIN32 /D_WINDOWS /W3 /MD /O1 /Ob1 /DNDEBUG  ","isGenerated":false,"language":"C","sources":["main.c"]}}
[rollbar] Unable to automatically determine compiler {"lang":"CXX","fileGroup":{"isGenerated":true,"sources":["build/CMakeFiles/97dc947cd7023b12d597309df2d3148e/generate.stamp.rule"]}}
[rollbar] Unable to automatically determine compiler {"lang":"C","fileGroup":{"compileFlags":"/DWIN32 /D_WINDOWS /W3 /MD /Zi /O2 /Ob1 /DNDEBUG  ","isGenerated":false,"language":"C","sources":["main.c"]}}

Platform and Versions

• Operating System: Windows 10
• CMake Version: 3.12.0
• VSCode Version: 1.25.1
• CMake Tools Extension Version: 1.1.0
• Compiler/Toolchain: Visual C++ 2017

[vector-of-bool]

Found the problem and have a fix. Should be released in a few hours along with a few other big fixes.

[go2sh]

try

set(CMAKE_CXX_COMPILER ${CMAKE_CXX_COMPILER} CACHE FILEPATH "Compiler")
set(CMAKE_C_COMPILER ${CMAKE_C_COMPILER} CACHE FILEPATH "Compiler")