CMake has landed experimental support for using the Standard modules.
This will be part of the CMake 3.30 release. This updates the build
instructions to use modules with CMake.
The changes have been tested locally.
---------
Co-authored-by: Will Hawkins <whh8b@obs.cr>
This CMakeLists.txt is used to build modules without build system
support. This was removed in d06ae33ec32122bb526fb35025c1f0cf979f1090.
This is used in the documentation how to use modules.
Made some minor changes to make it work with the std.compat module using
the std module.
Note the CMakeLists.txt in the build dir should be removed once build
system support is generally available.
Installs the source files of the experimental libc++ modules. These
source files (.cppm) are used by the Clang to build the std and
std.compat modules.
The design of this patch is based on a discussing in SG-15 on
12.12.2023. (SG-15 is the ISO C++ Tooling study group):
- The modules are installed at a location, that is not known to build
systems and compilers.
- Next to the library there will be a module manifest json file.
This json file contains the information to build the module from the
libraries sources. This information includes the location where the
sources are installed. @ruoso supplied the specification of this json
file.
- If possible, the compiler has an option to give the location of the
module manifest file
(https://github.com/llvm/llvm-project/pull/76451).
Currently there is no build system support, but it expected to be added
in the future.
Fixes: https://github.com/llvm/llvm-project/issues/73089
Revert "Revert #76246 and #76083"
This reverts commit 5c150e7eeba9db13cc65b329b3c3537b613ae61d.
Adds a small fix that should properly disable the tests on Windows.
Unfortunately the original poster has not provided feedback and the
original patch did not fail in the LLVM CI infrastructure.
Modules are known to fail on Windows due to non compliance of the
C library. Currently not having this patch prevents testing on other
platforms.
CMake officially supports binary directory variable of installed
dependency using `FetchContent`. According to the current documentation,
it fetches `std` module and use its binary directory as hardcoded
string, `${CMAKE_BINARY_DIR}/_deps/std-build`, however it can be
replaced with `${std_BINARY_DIR}`.
Reference: https://cmake.org/cmake/help/latest/module/FetchContent.html
These cause test build failures on Windows.
This reverts the following commits:
57ca74843586c9a93c425036c5538aae0a2cfa60
d06ae33ec32122bb526fb35025c1f0cf979f1090
This removes the entire modules testing infrastructure.
The current infrastructure uses CMake to generate the std and std.compat
module. This requires quite a bit of plumbing and uses CMake. Since
CMake introduced module support in CMake 3.26, modules have a higher
CMake requirement than the rest of the LLVM project. (The LLVM project
requires 3.20.) The main motivation for this approach was how libc++
generated its modules. Every header had its own module partition. This
was changed to improve performance and now only two modules remain. The
code to build these can be manually crafted.
A followup patch will reenable testing modules, using a different
approach.
The vendors of the MSVC STL, libstdc++ and libc++ have agreed [1] to
make the C++23 modules std and std.compat available in C++20. This
provides the std module; libc++ has not implemented the std.compat
module yet.
[1] https://github.com/microsoft/STL/issues/3945
Depends on D158357
Reviewed By: #libc, ldionne
Differential Revision: https://reviews.llvm.org/D158358
The patch is based on D144994.
D151030 added the module definitions for the module std.
This patch wires in the module and enables the basic testing.
Some notable features are missing:
- There is no test that libc++ can be fully imported as a module.
- This lacks the parts for the std.compat module.
- The module is not shipped with libc++.
Implements parts of
- P2465R3 Standard Library Modules std and std.compat
Reviewed By: ldionne, aaronmondal, #libc
Differential Revision: https://reviews.llvm.org/D151814
