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27 lines
1.5 KiB
27 lines
1.5 KiB
CMAKE_CROSSCOMPILING
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--------------------
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Intended to indicate whether CMake is cross compiling, but note limitations
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discussed below.
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This variable will be set to true by CMake if the :variable:`CMAKE_SYSTEM_NAME`
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variable has been set manually (i.e. in a toolchain file or as a cache entry
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from the :manual:`cmake <cmake(1)>` command line). In most cases, manually
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setting :variable:`CMAKE_SYSTEM_NAME` will only be done when cross compiling,
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since it will otherwise be given the same value as
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:variable:`CMAKE_HOST_SYSTEM_NAME` if not manually set, which is correct for
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the non-cross-compiling case. In the event that :variable:`CMAKE_SYSTEM_NAME`
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is manually set to the same value as :variable:`CMAKE_HOST_SYSTEM_NAME`, then
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``CMAKE_CROSSCOMPILING`` will still be set to true.
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Another case to be aware of is that builds targeting Apple platforms other than
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macOS are handled differently to other cross compiling scenarios. Rather than
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relying on :variable:`CMAKE_SYSTEM_NAME` to select the target platform, Apple
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device builds use :variable:`CMAKE_OSX_SYSROOT` to select the appropriate SDK,
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which indirectly determines the target platform. Furthermore, when using the
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Xcode generator, developers can switch between device and simulator builds at
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build time rather than having a single choice at configure time, so the concept
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of whether the build is cross compiling or not is more complex. Therefore, the
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use of ``CMAKE_CROSSCOMPILING`` is not recommended for projects targeting Apple
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devices.
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