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CrossCompiling: Support host platform with different architecture

Pavel Ferencz requested to merge shpala/cmake:pavel/support_crosscompilation_same_systemname into master

Teach CMake to support using -DCMAKE_SYSTEM_PROCESSOR= to activate cross-compiling to the host platform with a different architecture.

Original Description

Add crosscompilation support for same CMAKE_SYSTEM_NAME but different CMAKE_SYSTEM_PROCESSOR.

This is useful when building macOS fat (universal2) binaries.

For example this change will not reset and make use of CMAKE_SYSTEM_PROCESSOR after project() call even when target CMAKE_SYSTEM_NAME is the same as CMAKE_HOST_SYSTEM_NAME or is not defined.

Fixes: #25640
Topic-rename: crosscompiling-host-platform-different-arch

Edited by Brad King

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