SystemCLanguageTargets.cmake placed in wrong directory when using CMake FetchContent with SystemC

[Jench2103]

Hi, I encountered a problem while using the CMake FetchContent to set up SystemC as a dependency library of my project.

Once a clean build finishes, the SystemCLanguageTargets.cmake is put in an incorrect location (i.e., build/) rather than the folder expected by build/_deps/systemclanguage-build/SystemCLanguageConfig.cmake (i.e., build/_deps/systemclanguage-build/). I expect the SystemCLanguageTargets.cmake file to be placed in the same folder as SystemCLanguageConfig.cmake.

Note that a clean build can finish without any errors. However, starting from the second time CMake configures the project, the following error occurs:

CMake Error at build/_deps/systemclanguage-build/SystemCLanguageConfig.cmake:44 (include):
  include could not find requested file:

    /home/user/projects/systemc-test/build/_deps/systemclanguage-build/SystemCLanguageTargets.cmake
Call Stack (most recent call first):
  /usr/local/lib/python3.10/dist-packages/cmake/data/share/cmake-3.25/Modules/FetchContent.cmake:1951 (find_package)
  CMakeLists.txt:14 (fetchcontent_makeavailable)

Steps to Reproduce

Here is a simple example for anyone to reproduce the issue.

• File Structure

  .
  ├── build/
  ├── CMakeLists.txt
  └── main.cc
  

• CMakeLists.txt

  include(FetchContent)
  
  cmake_minimum_required(VERSION 3.25)
  
  project(test)
  
  fetchcontent_declare(
      SystemCLanguage
      GIT_REPOSITORY https://github.com/accellera-official/systemc.git
      GIT_TAG 3.0.0
      FIND_PACKAGE_ARGS
  )
  
  fetchcontent_makeavailable(SystemCLanguage)
  
  add_executable(test main.cc)
  target_link_libraries(test SystemC::systemc)

• main.cc

  int main() {
  	return 0;
  }

• Commands for a Clean Build

  mkdir build
  cd build
  cmake ..
  cmake --build . -j

• Commands for the Second Configuration (which will result in the above error):

  cd build
  cmake ..

Development Environment

• OS: Ubuntu 22.04
• Compiler: GCC 11.4.0
• CMake Version: 3.25.0

Please let me know if more details are needed, or if there's a known workaround.

[lmailletcontoz]

thanks for the feedback. The LWG will investigate the issue.