cpp-library: setting multiple linkages only produces one

[phreed]

Expected Behavior

On https://docs.gradle.org/current/userguide/cpp_library_plugin.html#sec:cpp_library_build_variants it says...
"The linkage expresses whether a shared library or static library should be created. Libraries can produce a shared library, a static library or both."

Current Behavior

When I specify the following only the shared (build/lib/main/debug/shared/windows/*.[dll ilk pdb]) files are produced.

linkage.set(listOf(Linkage.STATIC, Linkage.SHARED))

When I specify the following only the static library (build/lib/main/debug/windows/*.lib) file is produced.

linkage.set(listOf(Linkage.STATIC))

Context

It is often useful to have both the static and shared library.

Steps to Reproduce (for bugs)

There is a github project https://github.com/phreed/sample-build-cpp-app-lib-kotlin-dsl/tree/master which demonstrates the issue.

./gradlew :myapp:assemble

There are three branches:

• valid_app: This only has the static library and builds the app properly
• main: This sets both the static and shared library and illustrates the problem
• master: This version makes use of the add rather than the set function.

Your Environment

Windows 11 with VS Community 2017