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oatpp/cmake/compiler-flags.cmake
Steffen Olszewski 315d5ae498 Fix compilation on GCC 4.6 
The compiler flag `-fcf-protection` is only available since GCC 8.1.

Closes #892
2023-11-21 19:57:37 +01:00

331 lines
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CMake
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###################################################################################################
## INCLUDES #######################################################################################
###################################################################################################
include(CheckCXXCompilerFlag)
###################################################################################################
## FUNCTIONS ######################################################################################
###################################################################################################
#
# Add compiler flags without test (assume they are supported)
#
function(add_cxx_compiler_flags_no_test var)
foreach(flag ${ARGN})
set(${var} "${${var}} ${flag}")
endforeach()
set(${var} "${${var}}" PARENT_SCOPE)
endfunction()
#
# Add compiler flags with test (do not assume they are supported)
#
function(add_cxx_compiler_flags var)
foreach(flag ${ARGN})
string(REGEX REPLACE "[^a-zA-Z0-9]+" "_" flag_var "CXXFLAG_${flag}")
check_cxx_compiler_flag("${flag}" ${flag_var})
if(${flag_var})
set(${var} "${${var}} ${flag}")
endif()
endforeach()
set(${var} "${${var}}" PARENT_SCOPE)
endfunction()
#
# Add compiler flags
#
function(add_compiler_flags version)
if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL ${version})
foreach(flag ${ARGN})
add_cxx_compiler_flags_no_test(CMAKE_CXX_FLAGS ${flag})
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}" PARENT_SCOPE)
endforeach()
else (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL ${version})
foreach(flag ${ARGN})
add_cxx_compiler_flags(CMAKE_CXX_FLAGS ${flag})
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}" PARENT_SCOPE)
endforeach()
endif (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL ${version})
endfunction()
#
# Remove compiler flags
#
function(remove_any_compiler_flags var)
foreach(flag ${ARGN})
string(REPLACE "${flag}" "" ${var} "${${var}}")
string(REGEX REPLACE "[ \t]+" " " ${var} "${${var}}")
endforeach()
set(${var} "${${var}}" PARENT_SCOPE)
endfunction()
function(remove_compiler_flags)
foreach(flag ${ARGN})
remove_any_compiler_flags(CMAKE_CXX_FLAGS "${flag}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}" PARENT_SCOPE)
endforeach()
endfunction()
#
# Save and Restore compiler flags
#
function(save_compiler_flags)
set(CMAKE_CXX_FLAGS_SAVED "${CMAKE_CXX_FLAGS}" CACHE STRING "Saved compiler C++ flags" FORCE)
endfunction()
function(restore_compiler_flags)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS_SAVED}" )
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}" PARENT_SCOPE)
endfunction()
###################################################################################################
## COMPILER FLAGS #################################################################################
###################################################################################################
string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_LOWER)
#
# Generic flags
#
if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
add_compiler_flags(4.6 "-Wall")
add_compiler_flags(4.6 "-Wextra")
endif (CMAKE_CXX_COMPILER_ID MATCHES GNU)
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
add_compiler_flags(10 "-Weverything")
endif (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
#
# Preserve debug information flags
#
if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
add_compiler_flags(4.6 "-g3")
endif (CMAKE_CXX_COMPILER_ID MATCHES GNU)
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
add_compiler_flags(10 "-g3")
endif (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
#
# C/C++ Warning Flags
# See https://github.com/vadz/gcc-warnings-tools for gcc flags and versions
#
if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
add_compiler_flags(4.6 "-Wcast-align")
add_compiler_flags(4.6 "-Wconversion")
add_compiler_flags(4.6 "-Wdouble-promotion")
add_compiler_flags(4.6 "-Winvalid-pch")
add_compiler_flags(4.6 "-Wmissing-declarations")
add_compiler_flags(4.6 "-Wmissing-format-attribute")
add_compiler_flags(4.6 "-Wmissing-include-dirs")
add_compiler_flags(4.6 "-Wpointer-arith")
add_compiler_flags(4.6 "-Wredundant-decls")
add_compiler_flags(4.6 "-Wshadow")
add_compiler_flags(4.6 "-Wsign-conversion")
#add_compiler_flags(4.6 "-Wsuggest-attribute=const")
add_compiler_flags(4.6 "-Wsuggest-attribute=noreturn")
#add_compiler_flags(4.6 "-Wsuggest-attribute=pure")
add_compiler_flags(4.6 "-Wswitch-default")
add_compiler_flags(4.6 "-Wswitch-enum")
add_compiler_flags(4.6 "-Wtype-limits")
add_compiler_flags(4.6 "-Wundef")
add_compiler_flags(4.6 "-Wuninitialized")
add_compiler_flags(4.6 "-Wunknown-pragmas")
add_compiler_flags(4.6 "-Wunsafe-loop-optimizations")
add_compiler_flags(4.6 "-Wunused-but-set-parameter")
add_compiler_flags(4.6 "-Wunused-but-set-variable")
add_compiler_flags(4.6 "-Wunused-function")
add_compiler_flags(4.6 "-Wunused")
add_compiler_flags(4.6 "-Wunused-label")
add_compiler_flags(4.6 "-Wunused-macros")
#add_compiler_flags(4.6 "-Wunused-parameter")
add_compiler_flags(4.6 "-Wunused-result")
add_compiler_flags(4.6 "-Wunused-value")
add_compiler_flags(4.6 "-Wunused-variable")
add_compiler_flags(4.7 "-Wunused-local-typedefs")
add_compiler_flags(4.8 "-Wformat=2")
add_compiler_flags(4.8 "-Wsuggest-attribute=format")
add_compiler_flags(5.1 "-Wformat-signedness")
#add_compiler_flags(5.1 "-Wsuggest-final-methods")
#add_compiler_flags(5.1 "-Wsuggest-final-types")
add_compiler_flags(6.1 "-Wduplicated-cond")
add_compiler_flags(6.1 "-Wlogical-op")
add_compiler_flags(6.1 "-Wnull-dereference")
add_compiler_flags(7.1 "-Wduplicated-branches")
add_compiler_flags(7.1 "-Wformat-overflow=2")
add_compiler_flags(7.1 "-Wformat-truncation=2")
#add_compiler_flags(8.1 "-Wcast-align=strict")
add_compiler_flags(8.1 "-Wsuggest-attribute=cold")
add_compiler_flags(8.1 "-Wsuggest-attribute=malloc")
add_compiler_flags(10.1 "-Warith-conversion")
add_compiler_flags(12.1 "-ftrivial-auto-var-init=zero")
add_compiler_flags(12.1 "-Warray-compare")
add_compiler_flags(12.1 "-Wbidi-chars=unpaired,ucn")
add_compiler_flags(12.1 "-Winfinite-recursion")
add_compiler_flags(12.1 "-Wopenacc-parallelism")
add_compiler_flags(12.1 "-Wtrivial-auto-var-init")
endif (CMAKE_CXX_COMPILER_ID MATCHES GNU)
#
# C++ Warning Flags
# See https://github.com/vadz/gcc-warnings-tools for gcc flags and versions
#
if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
add_compiler_flags(4.6 "-Wctor-dtor-privacy")
add_compiler_flags(4.6 "-Wnoexcept")
add_compiler_flags(4.6 "-Wold-style-cast")
add_compiler_flags(4.6 "-Woverloaded-virtual")
add_compiler_flags(4.6 "-Wsign-promo")
add_compiler_flags(4.6 "-Wstrict-null-sentinel")
add_compiler_flags(4.7 "-Wzero-as-null-pointer-constant")
add_compiler_flags(4.8 "-Wuseless-cast")
add_compiler_flags(4.9 "-Wconditionally-supported")
add_compiler_flags(5.1 "-Wsuggest-override")
add_compiler_flags(7.1 "-Wnoexcept-type")
add_compiler_flags(8.1 "-Wextra-semi")
add_compiler_flags(10.1 "-Wcomma-subscript")
add_compiler_flags(10.1 "-Wmismatched-tags")
add_compiler_flags(10.1 "-Wredundant-tags")
add_compiler_flags(10.1 "-Wvolatile")
add_compiler_flags(11.1 "-Wctad-maybe-unsupported")
add_compiler_flags(11.1 "-Wdeprecated-enum-enum-conversion")
add_compiler_flags(11.1 "-Wdeprecated-enum-float-conversion")
add_compiler_flags(11.1 "-Winvalid-imported-macros")
add_compiler_flags(11.1 "-Wrange-loop-construct")
endif (CMAKE_CXX_COMPILER_ID MATCHES GNU)
#
# Allow the linker to remove unused data and functions
#
if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
add_compiler_flags(4.6 "-fdata-sections")
add_compiler_flags(4.6 "-ffunction-sections")
add_compiler_flags(4.6 "-fno-common")
add_compiler_flags(4.6 "-Wl,--gc-sections")
endif (CMAKE_CXX_COMPILER_ID MATCHES GNU)
#
# Hardening flags
# See https://developers.redhat.com/blog/2018/03/21/compiler-and-linker-flags-gcc
#
if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
IF (NOT CMAKE_BUILD_TYPE_LOWER STREQUAL "debug")
add_cxx_compiler_flags_no_test(CMAKE_CXX_FLAGS "-D_FORTIFY_SOURCE=2")
ENDIF (NOT CMAKE_BUILD_TYPE_LOWER STREQUAL "debug")
add_cxx_compiler_flags_no_test(CMAKE_CXX_FLAGS "-D_GLIBCXX_ASSERTIONS")
add_compiler_flags(4.6 "-fasynchronous-unwind-tables")
add_compiler_flags(4.6 "-fexceptions")
add_compiler_flags(8.1 "-fstack-clash-protection")
add_compiler_flags(4.6 "-fstack-protector-strong")
add_compiler_flags(4.6 "-grecord-gcc-switches")
# Issue 872: https://github.com/oatpp/oatpp/issues/872
# -fcf-protection is supported only on x86 GNU/Linux per this gcc doc:
# https://gcc.gnu.org/onlinedocs/gcc/Instrumentation-Options.html#index-fcf-protection
if ((CMAKE_SYSTEM_NAME STREQUAL "Linux") AND (CMAKE_SYSTEM_PROCESSOR MATCHES "(x86)|(X86)"))
add_compiler_flags(8.1 "-fcf-protection")
endif ()
add_compiler_flags(4.6 "-pipe")
add_compiler_flags(4.6 "-Werror=format-security")
add_compiler_flags(4.6 "-Wno-format-nonliteral")
add_compiler_flags(4.6 "-fPIE")
add_compiler_flags(4.6 "-Wl,-z,defs")
add_compiler_flags(4.6 "-Wl,-z,now")
add_compiler_flags(4.6 "-Wl,-z,relro")
endif (CMAKE_CXX_COMPILER_ID MATCHES GNU)
#
# Profiling and Debugging
# See https://fedoraproject.org/wiki/Changes/fno-omit-frame-pointer
#
#if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
# add_compiler_flags(4.6 "-fno-omit-frame-pointer")
#endif (CMAKE_CXX_COMPILER_ID MATCHES GNU)
#
# Disable some warnings
#
if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
add_compiler_flags(4.6 "-Wno-unused-parameter")
add_compiler_flags(9.1 "-Wno-pessimizing-move")
endif (CMAKE_CXX_COMPILER_ID MATCHES GNU)
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
add_compiler_flags(14 "-Wno-c++14-attribute-extensions")
add_compiler_flags(10 "-Wno-c++14-extensions")
add_compiler_flags(10 "-Wno-c++98-compat")
add_compiler_flags(10 "-Wno-c++98-compat-pedantic")
add_compiler_flags(10 "-Wno-covered-switch-default")
add_compiler_flags(10 "-Wno-delete-non-abstract-non-virtual-dtor")
add_compiler_flags(10 "-Wno-deprecated-copy-dtor")
add_compiler_flags(14 "-Wno-deprecated-copy-with-user-provided-dtor")
add_compiler_flags(10 "-Wno-documentation")
add_compiler_flags(10 "-Wno-documentation-unknown-command")
add_compiler_flags(10 "-Wno-exit-time-destructors")
add_compiler_flags(10 "-Wno-format-nonliteral")
add_compiler_flags(10 "-Wno-global-constructors")
add_compiler_flags(10 "-Wno-gnu-zero-variadic-macro-arguments")
add_compiler_flags(10 "-Wno-implicit-int-conversion")
add_compiler_flags(10 "-Wno-non-virtual-dtor")
add_compiler_flags(10 "-Wno-padded")
add_compiler_flags(10 "-Wno-pessimizing-move")
add_compiler_flags(99 "-Wno-return-std-move-in-c++11")
add_compiler_flags(10 "-Wno-reserved-id-macro")
add_compiler_flags(14 "-Wno-reserved-identifier")
add_compiler_flags(10 "-Wno-string-conversion")
add_compiler_flags(14 "-Wno-suggest-destructor-override")
add_compiler_flags(10 "-Wno-unknown-warning-option")
add_compiler_flags(10 "-Wno-unneeded-member-function")
add_compiler_flags(10 "-Wno-unreachable-code-return")
add_compiler_flags(10 "-Wno-unsafe-buffer-usage")
add_compiler_flags(10 "-Wno-unused-member-function")
add_compiler_flags(10 "-Wno-unused-parameter")
add_compiler_flags(10 "-Wno-unused-template")
add_compiler_flags(10 "-Wno-weak-vtables")
endif (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
#
# Sanitize flags
#
#if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
# add_compiler_flags(4.6 "-fsanitize=address")
# add_compiler_flags(4.6 "-fsanitize=thread")
#endif (CMAKE_CXX_COMPILER_ID MATCHES GNU)
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