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https://github.com/OPM/opm-simulators.git
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d9920e34eb
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.
51 lines
2.1 KiB
CMake
51 lines
2.1 KiB
CMake
# - Use only needed imports from libraries
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#
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# Add the -Wl,--as-needed flag to the default linker flags on Linux
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# in order to get only the minimal set of dependencies.
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function (prepend var_name value)
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# only add the prefix if it is not already at the beginning. this
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# prevents the same string to be added at the same place every time
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# we check for reconfiguration (e.g. "--as-needed" below)
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string (LENGTH "${value}" _val_len)
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string (LENGTH "${${var_name}}" _var_len)
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if (NOT (${_var_len} LESS ${_val_len}))
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string (SUBSTRING "${${var_name}}" 0 ${_val_len} _var_pre)
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else (NOT (${_var_len} LESS ${_val_len}))
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set (_var_pre)
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endif (NOT (${_var_len} LESS ${_val_len}))
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if (NOT ("${_var_pre}" STREQUAL "${value}"))
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if (${var_name})
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set (${var_name} "${value} ${${var_name}}" PARENT_SCOPE)
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else (${var_name})
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set (${var_name} "${value}")
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endif (${var_name})
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endif (NOT ("${_var_pre}" STREQUAL "${value}"))
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endfunction (prepend var_name value)
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option (ONLY_NEEDED_LIBRARIES "Instruct the linker to not use libraries which are unused" OFF)
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# only ELF shared objects can be underlinked, and only GNU will accept
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# these parameters; otherwise just leave it to the defaults
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if ((CMAKE_CXX_PLATFORM_ID STREQUAL "Linux") AND CMAKE_COMPILER_IS_GNUCC AND ONLY_NEEDED_LIBRARIES)
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# these are the modules whose probes will turn up incompatible
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# flags on some systems
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set (_maybe_underlinked
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SuiteSparse
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)
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# check if any modules actually reported problems (by setting an
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# appropriate linker flag)
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set (_underlinked FALSE)
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foreach (_module IN LISTS _maybe_underlinked)
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if ("${${_module}_LINKER_FLAGS}" MATCHES "-Wl,--no-as-needed")
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set (_underlinked TRUE)
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endif ("${${_module}_LINKER_FLAGS}" MATCHES "-Wl,--no-as-needed")
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endforeach (_module)
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# if we didn't have any problems, then go ahead and add
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if (NOT _underlinked)
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prepend (CMAKE_EXE_LINKER_FLAGS "-Wl,--as-needed")
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prepend (CMAKE_MODULE_LINKER_FLAGS "-Wl,--as-needed")
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prepend (CMAKE_SHARED_LINKER_FLAGS "-Wl,--as-needed")
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endif (NOT _underlinked)
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endif ((CMAKE_CXX_PLATFORM_ID STREQUAL "Linux") AND CMAKE_COMPILER_IS_GNUCC AND ONLY_NEEDED_LIBRARIES)
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