How to generate a *.so file on AIX with CMake - gcc

Question

With gcc the newer CMake V3.14 build a shared library in an archive format with ".a" suffix on AIX platform. But we need a *.so shared file. One solution what I have found is to patch /opt/freeware/share/cmake-3.14/Modules/Platform/AIX-GNU.cmake by adding the line "cp <OBJECT_DIR>/lib<TARGET_NAME>.so <TARGET_BASE>.so".
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
# This module is shared by multiple languages; use include blocker.
if(__AIX_COMPILER_GNU)
return()
endif()
set(__AIX_COMPILER_GNU 1)
macro(__aix_compiler_gnu lang)
set(CMAKE_SHARED_LIBRARY_RUNTIME_${lang}_FLAG "-Wl,-bnoipath -Wl,-blibpath:")
set(CMAKE_SHARED_LIBRARY_RUNTIME_${lang}_FLAG_SEP ":")
set(CMAKE_SHARED_MODULE_${lang}_FLAGS ${CMAKE_SHARED_LIBRARY_${lang}_FLAGS})
set(CMAKE_SHARED_MODULE_CREATE_${lang}_FLAGS ${CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS})
set(CMAKE_${lang}_USE_IMPLICIT_LINK_DIRECTORIES_IN_RUNTIME_PATH 1)
if(CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 7 OR CMAKE_SYSTEM_VERSION VERSION_LESS 7.1)
unset(CMAKE_${lang}_COMPILE_OPTIONS_VISIBILITY)
endif()
# By default, module are .so and shared libraries .a in AIX.
# As this comportment can be overwritten or misrespected we provides both .a and stripped .so.
set(CMAKE_${lang}_CREATE_SHARED_LIBRARY
"<CMAKE_${lang}_COMPILER> <CMAKE_SHARED_LIBRARY_${lang}_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS> <SONAME_FLAG><TARGET_SONAME> -o <OBJECT_DIR>/lib<TARGET_NAME>.so <OBJECTS> <LINK_LIBRARIES>"
"<CMAKE_AR> -c -q <TARGET> <OBJECT_DIR>/lib<TARGET_NAME>.so"
"cp <OBJECT_DIR>/lib<TARGET_NAME>.so <TARGET_BASE>.so" # <-- Patched line
"rm <OBJECT_DIR>/lib<TARGET_NAME>.so"
)
set(CMAKE_${lang}_CREATE_SHARED_MODULE
"<CMAKE_${lang}_COMPILER> <CMAKE_SHARED_MODULE_${lang}_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_MODULE_CREATE_${lang}_FLAGS> <SONAME_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>"
"strip -e -X32_64 <TARGET>"
)
endmacro()
Is there another possibility to switch on the *.so file generation?