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# Copyright 2021 DeepMind Technologies Limited
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
include(CheckCSourceCompiles)
# Gets the appropriate linker options for building MuJoCo, based on features available on the
# linker.
function(get_mujoco_extra_link_options OUTPUT_VAR)
if(MSVC)
set(EXTRA_LINK_OPTIONS /OPT:REF /OPT:ICF=5)
else()
set(EXTRA_LINK_OPTIONS)
if(WIN32)
set(CMAKE_REQUIRED_FLAGS "-fuse-ld=lld-link")
check_c_source_compiles("int main() {}" SUPPORTS_LLD)
if(SUPPORTS_LLD)
set(EXTRA_LINK_OPTIONS
${EXTRA_LINK_OPTIONS}
-fuse-ld=lld-link
-Wl,/OPT:REF
-Wl,/OPT:ICF
)
endif()
else()
set(CMAKE_REQUIRED_FLAGS "-fuse-ld=lld")
check_c_source_compiles("int main() {}" SUPPORTS_LLD)
if(SUPPORTS_LLD)
set(EXTRA_LINK_OPTIONS ${EXTRA_LINK_OPTIONS} -fuse-ld=lld)
else()
set(CMAKE_REQUIRED_FLAGS "-fuse-ld=gold")
check_c_source_compiles("int main() {}" SUPPORTS_GOLD)
if(SUPPORTS_GOLD)
set(EXTRA_LINK_OPTIONS ${EXTRA_LINK_OPTIONS} -fuse-ld=gold)
endif()
endif()
set(CMAKE_REQUIRED_FLAGS ${EXTRA_LINK_OPTIONS} "-Wl,--gc-sections")
check_c_source_compiles("int main() {}" SUPPORTS_GC_SECTIONS)
if(SUPPORTS_GC_SECTIONS)
set(EXTRA_LINK_OPTIONS ${EXTRA_LINK_OPTIONS} -Wl,--gc-sections)
else()
set(CMAKE_REQUIRED_FLAGS ${EXTRA_LINK_OPTIONS} "-Wl,-dead_strip")
check_c_source_compiles("int main() {}" SUPPORTS_DEAD_STRIP)
if(SUPPORTS_DEAD_STRIP)
set(EXTRA_LINK_OPTIONS ${EXTRA_LINK_OPTIONS} -Wl,-dead_strip)
endif()
endif()
endif()
endif()
set("${OUTPUT_VAR}"
${EXTRA_LINK_OPTIONS}
PARENT_SCOPE
)
endfunction()
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