cmake: set minimal C++ linker properties in minimal C++ CMake impl

The property based toolchain integration allows a cleaner design by
letting the toolchain define its properties and values and let CMake
implementation of Zephyr provided C and C++ libraries adjust those
properties when minimal C or C++ libraries are used.

This commit moves handling of C++ linker library properties into
the minimal C++ CMake implementation.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>

cmake/linker/ld/linker_libraries.cmake

@@ -16,7 +16,6 @@ if(NOT CONFIG_NATIVE_BUILD)
 endif()
 
 if(CONFIG_CPP
-   AND NOT CONFIG_MINIMAL_LIBCPP
    AND NOT CONFIG_NATIVE_LIBRARY
    # When new link principle is fully introduced, then the below condition can
    # be removed, and instead the external module c++ should use:

cmake/linker/lld/linker_flags.cmake

@@ -7,7 +7,7 @@
 # and adjust for lld specifics afterwards.
 include(${ZEPHYR_BASE}/cmake/linker/ld/linker_flags.cmake OPTIONAL)
 
-if(NOT CONFIG_MINIMAL_LIBCPP AND NOT CONFIG_NATIVE_LIBRARY AND NOT CONFIG_EXTERNAL_MODULE_LIBCPP)
+if(NOT CONFIG_NATIVE_LIBRARY AND NOT CONFIG_EXTERNAL_MODULE_LIBCPP)
   set_property(TARGET linker PROPERTY cpp_base ${LINKERFLAGPREFIX},-z,norelro)
 endif()
 

cmake/linker/lld/linker_libraries.cmake

@@ -8,7 +8,6 @@ set_linker_property(NO_CREATE TARGET linker PROPERTY rt_library "")
 set_linker_property(TARGET linker PROPERTY c++_library "-lc++;-lc++abi")
 
 if(CONFIG_CPP
-   AND NOT CONFIG_MINIMAL_LIBCPP
    AND NOT CONFIG_NATIVE_LIBRARY
    # When new link principle is fully introduced, then the below condition can
    # be removed, and instead the external module c++ should use:

cmake/linker/xt-ld/linker_flags.cmake

@@ -7,7 +7,7 @@ check_set_linker_property(TARGET linker PROPERTY base
                           ${LINKERFLAGPREFIX},--build-id=none
 )
 
-if(NOT CONFIG_MINIMAL_LIBCPP AND NOT CONFIG_NATIVE_LIBRARY AND NOT CONFIG_EXTERNAL_MODULE_LIBCPP)
+if(NOT CONFIG_NATIVE_LIBRARY AND NOT CONFIG_EXTERNAL_MODULE_LIBCPP)
   set_property(TARGET linker PROPERTY cpp_base -lstdc++)
 endif()
 

lib/cpp/minimal/CMakeLists.txt

@@ -1,5 +1,9 @@
 # SPDX-License-Identifier: Apache-2.0
 
+# Clear the toolchain defined C++ library property when using minimal C++ lib.
+set_linker_property(PROPERTY c++_library  "")
+set_linker_property(PROPERTY cpp_base "")
+
 zephyr_system_include_directories(include)
 
 zephyr_sources(