feat: interface, static or shared library type

[carlocorradini]

Part of PR #17

It's now possible to build different library types. SHARED, STATIC (default), or INTERFACE.

CMake options:

• ASIO_SEPARATE_COMPILATION Uses separately compiled source code for Asio's implementation Default: ON
• ASIO_DYN_LINK Uses separately compiled source code for Asio's implementation, with symbols exported for inclusion as part of a shared library Available only if ASIO_SEPARATE_COMPILATION is ON Default: OFF

Flow pseudocode:

if (NOT ASIO_SEPARATE_COMPILATION)
  // INTERFACE
elseif (NOT ASIO_DYN_LINK)
  // STATIC
else()
  // SHARED
endif()

[carlocorradini]

@OlivierLDff I've removed INCLUDE_HEADER_PATTERN "*.hpp" from packageProject because INTERFACE library requires *.ipp files. Currently packageProject does not support multiple INCLUDE_HEADER_PATTERN and therefore there is no way to specify both .cpp and .ipp files. Waiting issue https://github.com/TheLartians/PackageProject.cmake/issues/44 to be fixed

[carlocorradini]

@OlivierLDff CI fails with CMake 3.14 on ubuntu-latest. However, specifying: cmake -DCMAKE_BUILD_TYPE="" -DCMAKE_INSTALL_PREFIX=build/output -DASIO_USE_CPM="" -DASIO_SEPARATE_COMPILATION="" -DASIO_DYN_LINK="" -DASIO_NO_DEPRECATED="" -DASIO_ENABLE_EXAMPLES=ON -DASIO_ENABLE_INSTALL=ON -B build -S . on my systems (Windows and Ubuntu) works flawlessly. It looks like ASIO_LIBRARY_TYPE is set to INTERFACE but this is strange since both in my tests and logically should be STATIC. Any thoughts?

[OlivierLDff]

I guess if(NOT ASIO_SEPARATE_COMPILATION) returns true when ASIO_SEPARATE_COMPILATION is set to "". You could add logs? or specify values for ASIO_SEPARATE_COMPILATION in the include of the action?

This look like annoying CMake rules to debug

[carlocorradini]

@OlivierLDff Do we really need a job that sets all options to ""? Does adding more code for checking "" is worth it?

NOT ASIO_SEPARATE_COMPILATION is TRUE because ASIO_SEPARATE_COMPILATION is "" and is evaluated as a FALSE value

[OlivierLDff]

@OlivierLDff Do we really need a job that sets all options to ""? Does adding more code for checking "" is worth it?

NOT ASIO_SEPARATE_COMPILATION is TRUE because ASIO_SEPARATE_COMPILATION is "" and is evaluated as a FALSE value

No no additional code should be added, to me the problem is in the workflow file, that is buggy. Value should either be ON or OFF for all options, also don't wrap in "" the matrix options. So add a default value in the include of the action

[carlocorradini]

@OlivierLDff The problem is https://github.com/OlivierLDff/asio.cmake/blob/194137dd7300616ff1a3d65f43e57255bf751126/.github/workflows/main.yml#L27 This does not set any option (all are ""), what values (as default) to you prefer? STATIC library?

[OlivierLDff]

Yes include all parameters to the default values, this is the easiest I guess

[carlocorradini]

@OlivierLDff Fixed! 🥳