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Add Separate CMake Target for C++20 Modules (#4685)

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* Add Separate CMake Target for C++20 Modules

In the same vein as there is the `fmt::fmt-header-only`, `fmt::fmt` and
`fmt::fmt_c` targets, I propose the addition of a new target
`fmt::fmt-module` which will be for the compilation of the FMT_MODULE
library option.

The new target will have the properties requried for Compiling,
Installing and using the C++20 functionality in CMake

The `add_module_library` function is marked as deprecated as its
functionality is superseded.

Updated the logic for setting the FMT_USE_CMAKE_MODULE flag to check the
versions for Ninja and MSVC according the CMAKE Documents and setting
the FMT_MODULE flag based on this

* Add Separate CMake Target for C++20 Modules

In the same vein as there is the `fmt::fmt-header-only`, `fmt::fmt` and
`fmt::fmt_c` targets, I propose the addition of a new target
`fmt::fmt-module` which will be for the compilation of the FMT_MODULE
library option.

The new target will have the properties requried for Compiling,
Installing and using the C++20 functionality in CMake

Updated the logic for setting the FMT_USE_CMAKE_MODULE flag to check the
versions for Ninja and MSVC according the CMAKE Documents and setting
the FMT_MODULE flag based on this

Fixed the test/CMakeLists.txt file which used the FMT_MODULE flag to
separate the module and non-module library testing, in particular
disableing the module version.

The module testing still needs to be fixed, but the expected behavior of
testing the non-modular version is working.

---------

Co-authored-by: Mathew Benson <mathew@benson.co.ke>
Co-authored-by: ClausKlein <claus.klein@arcormail.de>
This commit is contained in:
Mathew Benson
2026-03-02 20:11:31 +03:00
committed by GitHub
parent fca0445565
commit 4e1b170b44
4 changed files with 126 additions and 54 deletions
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doc/api.md
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@@ -20,6 +20,12 @@ The {fmt} library API consists of the following components:
All functions and types provided by the library reside in namespace `fmt`
and macros have prefix `FMT_`.
## C++ Modules API
With the new C++ Modules API, all the headers listed above do not need to
be explicitly #included. We can instead use the `import fmt;` statement instead.
All other functionality, listed below remains the same.
## Base API
`fmt/base.h` defines the base API which provides main formatting functions