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CMake: Handle gc-sections linker flags 

Add a function to set gc-sections flags on the linker.

Change-Id: I9ac02364836d2aa8de239adb8d3a5d29659a4007
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
bb10
Tobias Hunger 2019-03-04 13:05:54 +01:00
parent f3e3832c4d
commit e1de70933e
1 changed files with 21 additions and 11 deletions
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32
cmake/QtBuild.cmake
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@ -191,15 +191,6 @@ macro(qt_parse_all_arguments result type flags options multiopts)
endmacro()
function(qt_internal_add_link_flags target to_add)
get_target_property(flags "${target}" LINK_FLAGS)
if ("${flags}" STREQUAL "flags-NOTFOUND")
set(flags "")
endif()
string(APPEND flags " ${to_add}")
set_target_properties("${target}" PROPERTIES LINK_FLAGS "${flags}")
endfunction()
function(qt_internal_add_link_flags_no_undefined target)
if (GCC OR CLANG)
if(APPLE)
@ -209,7 +200,26 @@ function(qt_internal_add_link_flags_no_undefined target)
else()
message(FATAL_ERROR "Platform linker doesn't support erroring upon encountering undefined symbols. Target:\"${target}\".")
endif()
qt_internal_add_link_flags("${target}" "${no_undefined_flag}")
target_link_options("${target}" PRIVATE "${no_undefined_flag}")
endif()
endfunction()
function(qt_internal_add_link_flags_gc_sections target visibility)
set(possible_visibilities PRIVATE INTERFACE PUBLIC)
list(FIND possible_visibilities "${visibility}" known_visibility)
if (known_visibility EQUAL "-1")
message(FATAL_ERROR "Visibitily setting must be one of PRIVATE, INTERFACE or PUBLIC.")
endif()
if (GCC OR CLANG)
if(APPLE)
set(gc_sections_flag "-Wl,-dead_strip")
elseif(LINUX OR BSD OR SOLARIS OR WIN32)
set(gc_sections_flag "-Wl,--gc-sections")
else()
message(FATAL_ERROR "Platform linker doesn't support gc sections. Target:\"${target}\".")
endif()
target_link_options("${target}" ${visibility} "${gc_sections_flag}")
endif()
endfunction()
@ -256,7 +266,7 @@ function(qt_internal_add_linker_version_script target)
WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
COMMENT "Generating version linker script"
)
qt_internal_add_link_flags("${target}" "-Wl,--version-script,${outfile}")
target_link_options("${target}" PRIVATE "-Wl,--version-script,${outfile}")
endif()
endif()
endfunction()