cmlib/thirdparty/sanitizers/FindCFI.cmake

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# The MIT License (MIT)
#
# Copyright (c)
# 2013 Matthew Arsenault 2015-2016 RWTH Aachen University, Federal Republic of Germany
# 2021 Markus Eggenbauer
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
# associated documentation files (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge, publish, distribute,
# sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all copies or
# substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
# NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
# OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
option(SANITIZE_CFI "Enable Control Flow Integrity (CFI) for sanitized targets." OFF)
set(FLAG_CANDIDATES
# FIXME: Brief comment on why the additional flags
# In this case you need a
# linker that does optimization at
# linking time such as LLVM lld or GNU gold.
"-g -fsanitize=cfi -fvisibility=hidden -flto -fuse-ld=lld")
# There might be some conflict with the other sanitizer
# hence it might need an if statement here.
# add some handy functions
include(sanitize-helpers)
sanitizer_check_compiler_flags("${FLAG_CANDIDATES}" "ControlFlowIntegrity" "CFI")
function(add_sanitize_cfi TARGET)
sanitizer_check_target(${TARGET})
sanitizer_add_flags(${TARGET} "ControlFlowIntegrity" "CFI")
endfunction()