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CMakeDetermineCompilerABI: Detect byte order as part of check

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We already detect `sizeof(void*)`.  Detect the byte order as part of the
same check.

Issue: #21392
This commit is contained in:
Brad King
2020-11-03 16:57:16 -05:00
parent 606b34b3a6
commit f511a1c009
23 changed files with 108 additions and 0 deletions
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Help/variable/CMAKE_LANG_BYTE_ORDER.rst
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CMAKE_<LANG>_BYTE_ORDER
-----------------------
.. versionadded:: 3.20
Byte order of ``<LANG>`` compiler target architecture, if known.
If defined and not empty, the value is one of:
``BIG_ENDIAN``
The target architecture is Big Endian.
``LITTLE_ENDIAN``
The target architecture is Little Endian.
This is defined for languages ``C``, ``CXX``, ``OBJC``, ``OBJCXX``,
and ``CUDA``.
If :variable:`CMAKE_OSX_ARCHITECTURES` specifies multiple architectures, the
value of ``CMAKE_<LANG>_BYTE_ORDER`` is non-empty only if all architectures
share the same byte order.