You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
57 lines
2.5 KiB
57 lines
2.5 KiB
# This function defines a linker script in place of the symlink traditionally
|
|
# created for shared libraries.
|
|
#
|
|
# More specifically, this function goes through the PUBLIC and INTERFACE
|
|
# library dependencies of <target> and gathers them into a linker script,
|
|
# such that those libraries are linked against when the shared library for
|
|
# <target> is linked against.
|
|
#
|
|
# Arguments:
|
|
# <target>: A target representing a shared library. A linker script will be
|
|
# created in place of that target's TARGET_LINKER_FILE, which is
|
|
# the symlink pointing to the actual shared library (usually
|
|
# libFoo.so pointing to libFoo.so.1, which itself points to
|
|
# libFoo.so.1.0).
|
|
|
|
function(define_linker_script target)
|
|
if (NOT TARGET "${target}")
|
|
message(FATAL_ERROR "The provided target '${target}' is not actually a target.")
|
|
endif()
|
|
|
|
get_target_property(target_type "${target}" TYPE)
|
|
if (NOT "${target_type}" STREQUAL "SHARED_LIBRARY")
|
|
message(FATAL_ERROR "The provided target '${target}' is not a shared library (its type is '${target_type}').")
|
|
endif()
|
|
|
|
set(symlink "$<TARGET_LINKER_FILE:${target}>")
|
|
set(soname "$<TARGET_SONAME_FILE_NAME:${target}>")
|
|
|
|
get_target_property(interface_libs "${target}" INTERFACE_LINK_LIBRARIES)
|
|
|
|
set(link_libraries)
|
|
if (interface_libs)
|
|
foreach(lib IN LISTS interface_libs)
|
|
if ("${lib}" STREQUAL "cxx-headers")
|
|
continue()
|
|
endif()
|
|
# If ${lib} is not a target, we use a dummy target which we know will
|
|
# have an OUTPUT_NAME property so that CMake doesn't fail when evaluating
|
|
# the non-selected branch of the `IF`. It doesn't matter what it evaluates
|
|
# to because it's not selected, but it must not cause an error.
|
|
# See https://gitlab.kitware.com/cmake/cmake/-/issues/21045.
|
|
set(output_name_tgt "$<IF:$<TARGET_EXISTS:${lib}>,${lib},${target}>")
|
|
set(libname "$<IF:$<TARGET_EXISTS:${lib}>,$<TARGET_PROPERTY:${output_name_tgt},OUTPUT_NAME>,${lib}>")
|
|
list(APPEND link_libraries "${CMAKE_LINK_LIBRARY_FLAG}${libname}")
|
|
endforeach()
|
|
endif()
|
|
string(REPLACE ";" " " link_libraries "${link_libraries}")
|
|
|
|
set(linker_script "INPUT(${soname} ${link_libraries})")
|
|
add_custom_command(TARGET "${target}" POST_BUILD
|
|
COMMAND "${CMAKE_COMMAND}" -E remove "${symlink}"
|
|
COMMAND "${CMAKE_COMMAND}" -E echo "${linker_script}" > "${symlink}"
|
|
COMMENT "Generating linker script: '${linker_script}' as file ${symlink}"
|
|
VERBATIM
|
|
)
|
|
endfunction()
|