Summary

BUILD_SHARED_LIBS_WITH_STATIC_MONGOC applies to static targets under some conditions. This disagrees with the option name and description.

Furthermore, the pkg-config scripts unconditionally have the static C++ driver targets depend on the static C driver targets (regardless of BUILD_SHARED_LIBS_WITH_STATIC_MONGOC).

To reproduce

Configuring with BUILD_SHARED_LIBS_WITH_STATIC_MONGOC=OFF:

cmake \
    -DBUILD_SHARED_AND_STATIC_LIBS=ON \
    -DBUILD_SHARED_LIBS_WITH_STATIC_MONGOC=OFF \
    -DCMAKE_INSTALL_PREFIX=.install1 \
    -S. -Bcmake-build1

cmake --build cmake-build1 --target install --parallel

Results in an installed bsoncxx_targets.cmake with:

set_target_properties(mongo::bsoncxx_static PROPERTIES
  # [ ... ]
  INTERFACE_LINK_LIBRARIES "\$<LINK_ONLY:bson::shared>"
)

And configuring with BUILD_SHARED_LIBS_WITH_STATIC_MONGOC=ON:

cmake \
    -DBUILD_SHARED_AND_STATIC_LIBS=ON \
    -DBUILD_SHARED_LIBS_WITH_STATIC_MONGOC=ON \
    -DCMAKE_INSTALL_PREFIX=.install2 \
    -S. -Bcmake-build2

cmake --build cmake-build2 --target install --parallel

Results in an installed bsoncxx_targets.cmake with:

set_target_properties(mongo::bsoncxx_static PROPERTIES
  # [ ... ]
  INTERFACE_LINK_LIBRARIES "\$<LINK_ONLY:bson::static>"
)

Details

• BUILD_SHARED_LIBS_WITH_STATIC_MONGOC=OFF is the default.
• If BUILD_SHARED=OFF, then BUILD_SHARED_LIBS_WITH_STATIC_MONGOC is ignored, and static C++ driver targets use static C targets.
• This is further complicated by differences in the pkg-config scripts. The static C++ driver pkg-config targets always depend on the static C driver targets (regardless of BUILD_SHARED_LIBS_WITH_STATIC_MONGOC). This was noticed after an accidental change (static => shared) restored in CXX-3290.