tree 08fe81417c136cfb716a53fa3db2fb91bdc83b4c
parent ff30a5397d804b9de564d54868bd5fdf504361c2
author Ben Boeckel <ben.boeckel@kitware.com> 1649440593 -0400
committer Ben Boeckel <ben.boeckel@kitware.com> 1655389714 -0400

cmTarget: add support for C++ module fileset types

C++ modules have two variants which are of importance to CMake:

  - `CXX_MODULES`: interface modules (those using `export module M;`,
    `export module M:part;`, or `module M:internal_part;`)
  - `CXX_MODULE_HEADER_UNITS`: importable header units

Creating C++ modules or partitions are *not* supported in any other
source listing. This is because the source files must be installed (so
their scope matters), but not part of usage requirements (what it means
for a module source to be injected into a consumer is not clear at this
moment). Due to the way `FILE_SET` works with scopes, they are a perfect
fit as long as `INTERFACE` is not allowed (which it is not).