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Updated readme with notes about GCC

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Chuck Walbourn 2021-10-17 14:05:27 -07:00
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@ -57,8 +57,19 @@ Documentation is available on the [Microsoft Docs](https://docs.microsoft.com/en
Officially the library is supported with Microsoft Visual C++ 2017 or later, clang/LLVM v9 or later, and GCC 9 or later. It should also compile with the Intel C++ and MinGW compilers.
When building with clang/LLVM or other GNU C compilers, the ``_XM_NO_XMVECTOR_OVERLOADS_`` control define is set because these compilers do not support creating operator overloads for the ``XMVECTOR`` type. You can choose to enable this preprocessor define explicitly to do the same thing with Visual C++ for improved portability.
To build for non-Windows platforms, you need to provide a ``sal.h`` header in your include path. You can obtain an open source version from [GitHub](https://github.com/dotnet/corert/blob/master/src/Native/inc/unix/sal.h).
With GCC, the SAL annotation preprocessor symbols can conflict with the GNU implementation of the Standard C++ Library. The workaround is to include the system headers before including DirectXMath:
```
#include <algorithm>
#include <utility>
#include <DirectXMath.h>
```
## Notices
All content and source code for this package are subject to the terms of the [MIT License](http://opensource.org/licenses/MIT).