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make the "-Wl,--as-needed" flag optional

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as there is not much harm done if it is not used but it may cause the
build to fail if it is present (read: it causes _my_ build to fail),
it defaults to OFF.
This commit is contained in:
Andreas Lauser
2014-04-16 11:57:25 +02:00
committed by Bård Skaflestad
parent 4fd75a4433
commit d9920e34eb
1 changed files with 4 additions and 2 deletions
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6
cmake/Modules/UseOnlyNeeded.cmake
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@@ -23,9 +23,11 @@ function (prepend var_name value)
endif (NOT ("${_var_pre}" STREQUAL "${value}")) endif (NOT ("${_var_pre}" STREQUAL "${value}"))
endfunction (prepend var_name value) endfunction (prepend var_name value)
option (ONLY_NEEDED_LIBRARIES "Instruct the linker to not use libraries which are unused" OFF)
# only ELF shared objects can be underlinked, and only GNU will accept # only ELF shared objects can be underlinked, and only GNU will accept
# these parameters; otherwise just leave it to the defaults # these parameters; otherwise just leave it to the defaults
if ((CMAKE_CXX_PLATFORM_ID STREQUAL "Linux") AND CMAKE_COMPILER_IS_GNUCC) if ((CMAKE_CXX_PLATFORM_ID STREQUAL "Linux") AND CMAKE_COMPILER_IS_GNUCC AND ONLY_NEEDED_LIBRARIES)
# these are the modules whose probes will turn up incompatible # these are the modules whose probes will turn up incompatible
# flags on some systems # flags on some systems
set (_maybe_underlinked set (_maybe_underlinked
@@ -45,4 +47,4 @@ if ((CMAKE_CXX_PLATFORM_ID STREQUAL "Linux") AND CMAKE_COMPILER_IS_GNUCC)
prepend (CMAKE_MODULE_LINKER_FLAGS "-Wl,--as-needed") prepend (CMAKE_MODULE_LINKER_FLAGS "-Wl,--as-needed")
prepend (CMAKE_SHARED_LINKER_FLAGS "-Wl,--as-needed") prepend (CMAKE_SHARED_LINKER_FLAGS "-Wl,--as-needed")
endif (NOT _underlinked) endif (NOT _underlinked)
endif ((CMAKE_CXX_PLATFORM_ID STREQUAL "Linux") AND CMAKE_COMPILER_IS_GNUCC) endif ((CMAKE_CXX_PLATFORM_ID STREQUAL "Linux") AND CMAKE_COMPILER_IS_GNUCC AND ONLY_NEEDED_LIBRARIES)