This cleans up the new options that were added to support Swift. This
was not released, and the proper support approach that we settled upon
does not require as much specialised support.
This adds the placeholders that are needed to merge the swift partial
modules. It permits generating the rules necessary to actually merge
the partial modules emitted for a partial compilation.
When building a swift object, we emit a partial swiftmodule and swiftdoc
that must be merged at the end. However, in order to do that, we need
to enumerate the swiftmodules and swiftdocs. As a result, the path must
be known to CMake. Rather than hardcoding the rules into CMake, create
a source property that we can query. This will allow us to create a
final placeholder to emit the merge rule.
Issue: #18800
This allows us to set the proper link name for the Swift library
(soname). Because this needs to be passed to the object being compiled,
we need to create a new placeholder so that it can be sent along to the
frontend. Default to the target name unless it is explicitly provided.
Add a new `SWIFT_MODULE_NAME` property that defaults to the target name.
This is needed as otherwise, the first source file determines the module
name.
Issue: #18800
The swift compilation model requires all sources for the module to be
listed for the compiler to type check across them. Provide a
placeholder to allow enumerating the remainder of the swift sources in a
target for the language compile rule.
Issue: #18800
Add `CMAKE_SYSROOT_COMPILE` and `CMAKE_SYSROOT_LINK` variables to as
operation-specific alternatives to `CMAKE_SYSROOT`. This will be useful
for Android NDKs that compile and link with different sysroot values
(e.g. `r14` with unified headers).
Co-Author: Florent Castelli <florent.castelli@gmail.com>
Refactoring in commit b29425f7 (cmLocalGenerator: Populate a container
of mappings for replacements, 2016-10-09) broke substitution of this
placeholder by storing the wrong key in the new replacement map.
Use the proper key, `CMAKE_<LANG>_COMPILER_ARG1`.
