bug: 3.22 + Ninja Multi-Config + CMAKE_CONFIGURATION_TYPES env var

CMake 3.22 introduced environment variable CMAKE_CONFIGURATION_TYPES to set multi configuration types.

The problem appears when environment variable CMAKE_CONFIGURATION_TYPES is set to a list starting with Release, causing surprising breakage of try_compile() with Ninja Multi-Config, even for internal CMake scripts.

NOTE: using set(CMAKE_CONFIGURATION_TYPES Release;Debug) does NOT trigger the bug. It has to be environment variable CMAKE_CONFIGURATION_TYPES=Release;Debug (has to have Release as first entity of list).

I used:

• Linux, MacOS or Windows
• Ninja Multi-Config
• GCC, Clang, Intel, IntelLLVM
• environment variable CMAKE_CONFIGURATION_TYPES=Release;... (Release is first, others don't care)

NOTE: This bug is NOT FindMPI specific, I just happened to notice it with FindMPI's internal try_compile():

Reproduce problem

Set environment variable CMAKE_CONFIGURATION_TYPES=Release;Debug

Use CMakeLists.txt like:

cmake_minimum_required(VERSION 3.22)

project(oops LANGUAGES C)

find_package(MPI) 

> cmake -B build -G "Ninja Multi-Config"

results in:

-- The C compiler identification is GNU 11.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - failed
-- Check for working C compiler: C:/msys64/mingw64/bin/cc.exe
-- Check for working C compiler: C:/msys64/mingw64/bin/cc.exe - works
-- Detecting C compile features
-- Detecting C compile features - done
CMake Error at C:/cmake-3.22.0-windows-x86_64/share/cmake-3.22/Modules/FindMPI.cmake:1267 (try_compile):
  Cannot copy output executable

    ''

  to destination specified by COPY_FILE:

    'C:/temp/build/CMakeFiles/FindMPI/test_mpi_C.bin'

  Unable to find the executable at any of:

    C:/temp/build/CMakeFiles/CMakeTmp/cmTC_cf635.exe
    C:/temp/build/CMakeFiles/CMakeTmp/Debug/cmTC_cf635.exe
    C:/temp/build/CMakeFiles/CMakeTmp/Development/cmTC_cf635.exe

Call Stack (most recent call first):
  c:/cmake-3.22.0-windows-x86_64/share/cmake-3.22/Modules/FindMPI.cmake:1319 (_MPI_try_staged_settings)
  C:/cmake-3.22.0-windows-x86_64/share/cmake-3.22/Modules/FindMPI.cmake:1642 (_MPI_check_lang_works)
  CMakeLists.txt:5 (find_package)


CMake Error at C:/cmake-3.22.0-windows-x86_64/share/cmake-3.22/Modules/FindMPI.cmake:1746 (file):
  file STRINGS file "C:/temp/build/CMakeFiles/FindMPI/test_mpi_C.bin" cannot
  be read.
Call Stack (most recent call first):
  CMakeLists.txt:5 (find_package)


-- Found MPI_C: C:/msys64/mingw64/lib/libmsmpi.a
-- Found MPI: TRUE  found components: C
-- Configuring incomplete, errors occurred!

Notice in CMakeError.log and CMakeOutput.log that "Release" has infiltrated try_compile() commands, causing the failure.

Reference: this was causing #22824 (closed), but I didn't realize the details then