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cmake: treat building for another ISA as a cross-compile. #1353

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Sep 19, 2024
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cmake: treat building for another ISA as a cross-compile. #1353

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22 changes: 22 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -636,6 +636,28 @@ else (USE_STATIC_RT)
message(STATUS "Use DYNAMIC runtime")
endif(USE_STATIC_RT)

#
# CMake's definition of "cross-compiling" appears to be "compiling
# for an *operating system* other than the one on which the build
# is being done*.
#
# This is an inadequate definition, as people build for the same
# operating system but a different instruciton set, e.g. building
# on an IA-32 or x86-64 Linux box for an Arm embedded Linux box,
# or building Arm code on an IA-32 or x86-64 Windows box.
#
# At least for the Windows case, people may do those builds by
# setting the target with th -A flag to CMake; that causes
# CMAKE_GENERATOR_PLATFORM to be set to the target. If
# CMAKE_GENERATOR_PLATFORM is set, compare it with
# CMAKE_HOST_SYSTEM_PROCESSOR and, if they're not equal, set
# CMAKE_CROSSCOMPILING to TRUE.
#
if (CMAKE_GENERATOR_PLATFORM AND
NOT CMAKE_GENERATOR_PLATFORM STREQUAL CMAKE_HOST_SYSTEM_PROCESSOR)
set(CMAKE_CROSSCOMPILING TRUE)
endif()

###################################################################
# Detect available platform features
###################################################################
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