Error when compiling the project with Unix

[Muqi-Zou]

Hi:
I meet following error when trying to compile the project with command :
msbuild /p:Configuration=UnixRelease /p:Platform=x64 src/Reko-decompiler.sln

"/home/muqi/decompile_tool/reko/src/Reko-decompiler.sln" (default target) (1) ->
"/home/muqi/decompile_tool/reko/src/Native/NativeProxy.csproj" (default target) (64) ->
(AfterBuild target) -> 
  EXEC : CMake error : CMAKE_C_COMPILER not set, after EnableLanguage [/home/muqi/decompile_tool/reko/src/Native/NativeProxy.csproj]
  EXEC : CMake error : CMAKE_CXX_COMPILER not set, after EnableLanguage [/home/muqi/decompile_tool/reko/src/Native/NativeProxy.csproj]
  /home/muqi/decompile_tool/reko/src/Native/NativeProxy.csproj(167,5): error MSB3073: The command "cmake -DREKO_PATH="/home/muqi/decompile_tool/reko/src/../" -DCMAKE_BUILD_TYPE=UnixRelease -DREKO_PLATFORM=x64 -P "/home/muqi/decompile_tool/reko/src/Native/reko.cmake"" exited with code 1.

    16 Warning(s)
    3 Error(s)

I believe I have installed all require package for .Net Frame, C# and cmake, though I am not 100% sure. Meanwhile, running "cmake .. && make" in Native/build works good for me.
Here is the info of my desktop:

OS: Ubuntu 18.04.5 (LTS)
arch: x86_64
msbuild -version: 16.6.0.60701
cmake --version: cmake version 3.10.2
mono --version: Mono JIT compiler version 6.12.0.107 (tarball Thu Dec 10 05:22:56 UTC 2020)

[uxmal]

As an initial workaround, try setting the CMAKE_C_COMPILER and CMAKE_CXX_COMPILER environment variables to something appropriate for your system, e.g. /usr/bin/gcc and /usr/bin/g++ respectively.

[Muqi-Zou]

here is what I have tried:

1. start with a new folder to download reko
2. run following commands to install necessary packages:

msbuild /t:restore /p:Configuration=UnixRelease /p:Platform=x64 src/Reko-decompiler.sln
nuget restore src/Reko-decompiler.sln

3. run following to set the CMAKE:

muqi@muqi-desktop:~/decompile_tool/reko$ which gcc
/usr/bin/gcc
muqi@muqi-desktop:~/decompile_tool/reko$ which g++
/usr/bin/g++
muqi@muqi-desktop:~/decompile_tool/reko$ which clang
/usr/bin/clang
muqi@muqi-desktop:~/decompile_tool/reko$ export CMAKE_C_COMPILER=/usr/bin/gcc
muqi@muqi-desktop:~/decompile_tool/reko$ export CMAKE_CXX_COMPILER=/usr/bin/g++

4(a). run msbuild /p:Configuration=UnixRelease /p:Platform=x64 src/Reko-decompiler.sln and same problem appears.
4(b). run cmake -D CMAKE_C_COMPILER=/usr/bin/gcc -D CMAKE_CXX_COMPILER=/usr/bin/g++ -DREKO_PATH="/home/muqi/decompile_tool/reko/src/../" -DCMAKE_BUILD_TYPE=UnixRelease -DREKO_PLATFORM=x64 -P "/home/muqi/decompile_tool/reko/src/Native/reko.cmake" at ./reko/src/Native$

== Configuration ==
=> Build Type: UnixRelease
=> Generator : 
=> Platform  : x64

-- Building native libraries
CMake Error at CMakeLists.txt:3 (project):
  Generator

    Unix Makefiles

  does not support platform specification, but platform

    x64

  was specified.


CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage
-- Configuring incomplete, errors occurred!
See also "/home/muqi/decompile_tool/reko/src/Native/build/x64/UnixRelease/CMakeFiles/CMakeOutput.log".
CMake Error at reko.cmake:104 (message):
  [CMake] native configuration failed for:
  /home/muqi/decompile_tool/reko/src/Native
Call Stack (most recent call first):
  reko.cmake:36 (invoke_cmake)
  reko.cmake:139 (process_project)

[smx-smx]

We're building on multiple CIs and i cannot reproduce this.
I'd try again on a fresh clone of the master branch in a new directory, but it looks like cmake is having troubles detecting a working C compiler on your system.

Does any other cmake project (like a hello world C project) work?

[Muqi-Zou]

Yes, I think I updated my cmake as well.

muqi@muqi-desktop:~/decompile_tool/reko/src/Native$ which cmake
/usr/bin/cmake
muqi@muqi-desktop:~/decompile_tool/reko/src/Native$ cmake --version
cmake version 3.20.0

CMake suite maintained and supported by Kitware (kitware.com/cmake).