When consuming exported targets which contain C++ modules, the consuming
project must be able to recompile BMI files using the original target's
flags. This is because a module source may use some private target usage
requirement but not want to propagate it to consumers. To facilitate
this, export the private information as necessary for consumers to be
able to perform the BMI compilations.
Clang 17 is in a transition where it warns about transitive usages. Turn
it into an error if the flag is available to make sure we're testing the
feature properly.
When multiple source files in a single target have the same name, we
already set `ObjectFileName` explicitly to avoid a `.obj` collision. For
C++ module sources, set `Module{Output,Dependencies}File` to avoid
`.ifc` and `.module.json` collisions.
Fixes: #25038
When generating the `IMPORTED_CXX_MODULES_[CONFIG]` target property,
there was a missing path separator after a non-empty relative directory
part of the path to a module source file.
Co-authored-by: Brad King <brad.king@kitware.com>
Calling `install(EXPORT)` with the `CXX_MODULES_DIRECTORY` parameter
leads to installation rules being generated which `include()` CMake
scripts that set the `IMPORTED_CXX_MODULES_[CONFIG]` target property for
relevant targets. However, these scripts don't get generated for
targets in an export set which don't have any C++20 modules. When the
installation rules attempt to `include()` the missing scripts, the
install fails.
Co-authored-by: Brad King <brad.king@kitware.com>
The existing `export-interfaces-{build,install}` tests were actually
doing this, but make those test exporting the interfaces and copy the
existing tests to tests which explicitly test the "no properties"
condition.
Run the `clang-format.bash` script to update all our C and C++ code to a
new style defined by `.clang-format`. Use `clang-format` version 15.
* If you reached this commit for a line in `git blame`, re-run the blame
operation starting at the parent of this commit to see older history
for the content.
* See the parent commit for instructions to rebase a change across this
style transition commit.
Fixes: #24315
These patches now support the `-MF` output, so remove the `none` support
added just for the old patchset which did not use it.
Also update the flag name to `-fmodule-output=`.
Due to the new Clang module mapper flag, use a new experimental support
UUID as well.
2c558cfd1b gitlab-ci: add CI jobs for Clang with C++20 modules
abd42e9cfc ci: add a Docker container for clang support of C++20 modules
51093f3002 Clang-FindBinUtils: also find `clang-scan-deps`
0b333de923 ci: add C++ module rules file for Clang
21b9fb1e8c cmCxxModuleMapper: support the `clang` module map format
9c66224668 cmNinjaTargetGenerator: skip setting `depfile` for `none` scantypes
9123a0991f cmNinjaTargetGenerator: use `.clear()` to empty out some strings
Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Cristian Adam <cristian.adam@gmail.com>
Merge-request: !7978
The `CXX_SCAN_FOR_MODULES` property may be used to control scanning for
targets and for source files rather than assuming "C++20 always needs to
be scanned".
Not in the same executable (as that is IFNDR), but in the same project.
This tests to make sure that there's not some project-wide cache that
gets confused.
The build should fail. However, the error message is completely
generator-dependent as it is the build tool which (should) eventually
detect this case.
This includes a number of examples that should work for various levels
of support in a compiler.
There are a number of tests which are gated on various features in the
compilers. To enable the tests, set `CMake_TEST_MODULE_COMPILATION` to a
comma-separated (to avoid `;`-escaping problems) to the list of features
which are supported:
- `named`: Named modules are supported.
- `shared`: Shared libraries with module usage at the API boundary are
supported.
- `partitions`: Named module partitions are supported.
- `internal_partitions`: Named module internal partitions are
supported.
Additionally, a `CMake_TEST_MODULE_COMPILATION_RULES` file must be
passed which contains the rules for how to build modules using the
provided compiler. It will be included in the tests to provide these
rules. To verify that the file provided works as intended, it must set
`CMake_TEST_CXXModules_UUID` to a specific version to indicate that it
is an expected file.
Ben Boeckel