Commits on May 22, 2024

1. Ensure that the choice of compiler and target is passed to sub-projects. …

   If not explicitly set using exported environment variables, the choice
   of compilers and compiler targets used by CMake does not get propagated
   to sub-porjects created with ExternalProject_Add or
   FetchContent_Declare.
   
   In most cases this does not matter, because very few people are building
   using non-default compilers for their environment, but it can cause
   issues in two specific cases:
   
   - If building for the same system that the build is happening on, but
     using a non-default compiler specified using CMake arguments (instead
     of via exported environment variables), sub-projects will still use
     the default compiler for the system, which may result in linking
     errors (or runtime failures even if the link succeeds).
   - If cross-compiling and not using the preferred approaches of either a
     toolchain file or exported environment variables, sub-projects may not
     even build for the correct CPU architecture, causing the build to
     fail.
   
   This adds logic to ensure that the compiler and compiler targets get
   propagated correctly even if they are just specified on the command
   line, thus avoiding the above two possibilities.

   

   Ferroin committed May 22, 2024
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