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Help/dev/experimental: document C++20 module limitations

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Ben Boeckel
2022-11-28 12:07:02 -05:00
parent 388acfd46d
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@@ -24,6 +24,31 @@ In order to support C++20 modules, there are a number of behaviors that have
CMake APIs to provide the required features to build and export them from a
project.
Limitations
-----------
There are a number of known limitations of the current C++20 module support in
CMake. This does not document known limitations or bugs in compilers as these
can change over time.
For all generators:
- Only in-project modules may be used. While there is some support for
exporting module information, there is no mechanism for using it at the
moment.
For the Ninja Generators:
- ``ninja`` 1.10 or newer is required.
For the Visual Studio Generators:
- Only Visual Studio 2022 and toolchains newer than 19.34 (Visual Studio
17.4).
- No support for exporting or installing BMI or module information.
- No diagnosis of using modules provided by ``PRIVATE`` sources from
``PUBLIC`` module sources.
C++20 Module Dependencies
=========================