diff options
Diffstat (limited to 'packaging/cmake/Modules/NetdataCompilerFlags.cmake')
| -rw-r--r-- | packaging/cmake/Modules/NetdataCompilerFlags.cmake | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/packaging/cmake/Modules/NetdataCompilerFlags.cmake b/packaging/cmake/Modules/NetdataCompilerFlags.cmake new file mode 100644 index 000000000..28b43b4ec --- /dev/null +++ b/packaging/cmake/Modules/NetdataCompilerFlags.cmake @@ -0,0 +1,102 @@ +# Functions to simplify handling of extra compiler flags. +# +# Copyright (c) 2024 Netdata Inc. +# SPDX-License-Identifier: GPL-3.0-or-later + +include(CheckCCompilerFlag) +include(CheckCXXCompilerFlag) + +# Construct a pre-processor safe name +# +# This takes a specified value, and assigns the generated name to the +# specified target. +function(make_cpp_safe_name value target) + string(REPLACE "-" "_" tmp "${value}") + string(REPLACE "=" "_" tmp "${tmp}") + set(${target} "${tmp}" PARENT_SCOPE) +endfunction() + +# Conditionally add an extra compiler flag to C and C++ flags. +# +# If the language flags already match the `match` argument, skip this flag. +# Otherwise, check for support for `flag` and if support is found, add it to +# the compiler flags for the run. +function(add_simple_extra_compiler_flag match flag) + set(CMAKE_REQUIRED_FLAGS "-Werror") + + make_cpp_safe_name("${flag}" flag_name) + + if(NOT ${CMAKE_C_FLAGS} MATCHES ${match}) + check_c_compiler_flag("${flag}" HAVE_C_${flag_name}) + endif() + + if(NOT ${CMAKE_CXX_FLAGS} MATCHES ${match}) + check_cxx_compiler_flag("${flag}" HAVE_CXX_${flag_name}) + endif() + + if(HAVE_C_${flag_name} AND HAVE_CXX_${flag_name}) + add_compile_options("${flag}") + add_link_options("${flag}") + endif() +endfunction() + +# Same as add_simple_extra_compiler_flag, but check for a second flag if the +# first one is unsupported. +function(add_double_extra_compiler_flag match flag1 flag2) + set(CMAKE_REQUIRED_FLAGS "-Werror") + + make_cpp_safe_name("${flag1}" flag1_name) + make_cpp_safe_name("${flag2}" flag2_name) + + if(NOT ${CMAKE_C_FLAGS} MATCHES ${match}) + check_c_compiler_flag("${flag1}" HAVE_C_${flag1_name}) + if(NOT HAVE_C_${flag1_name}) + check_c_compiler_flag("${flag2}" HAVE_C_${flag2_name}) + endif() + endif() + + if(NOT ${CMAKE_CXX_FLAGS} MATCHES ${match}) + check_cxx_compiler_flag("${flag1}" HAVE_CXX_${flag1_name}) + if(NOT HAVE_CXX_${flag1_name}) + check_cxx_compiler_flag("${flag2}" HAVE_CXX_${flag2_name}) + endif() + endif() + + if(HAVE_C_${flag1_name} AND HAVE_CXX_${flag1_name}) + add_compile_options("${flag1}") + add_link_options("${flag1}") + elseif(HAVE_C_${flag2_name} AND HAVE_CXX${flag2_name}) + add_compile_options("${flag2}") + add_link_options("${flag2}") + endif() +endfunction() + +if(CMAKE_BUILD_TYPE STREQUAL "Debug") + option(DISABLE_HARDENING "Disable adding extra compiler flags for hardening" TRUE) +else() + option(DISABLE_HARDENING "Disable adding extra compiler flags for hardening" FALSE) +endif() + +option(ENABLE_ADDRESS_SANITIZER "Build with address sanitizer enabled" False) +mark_as_advanced(ENABLE_ADDRESS_SANITIZER) + +if(ENABLE_ADDRESS_SANITIZER) + set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=address") +endif() + +set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_C_FLAGS}") + +if(NOT ${DISABLE_HARDENING}) + add_double_extra_compiler_flag("stack-protector" "-fstack-protector-strong" "-fstack-protector") + add_double_extra_compiler_flag("_FORTIFY_SOURCE" "-D_FORTIFY_SOURCE=3" "-D_FORTIFY_SOURCE=2") + add_simple_extra_compiler_flag("stack-clash-protection" "-fstack-clash-protection") + add_simple_extra_compiler_flag("-fcf-protection" "-fcf-protection=full") + add_simple_extra_compiler_flag("branch-protection" "-mbranch-protection=standard") +endif() + +foreach(FLAG function-sections data-sections) + add_simple_extra_compiler_flag("${FLAG}" "-f${FLAG}") +endforeach() + +add_simple_extra_compiler_flag("-Wbuiltin-macro-redefined" "-Wno-builtin-macro-redefined") +add_simple_extra_compiler_flag("-fexecptions" "-fexceptions") |