248 lines
11 KiB
CMake
248 lines
11 KiB
CMake
|
# Copyright (C) Viktor Szakats
|
||
|
|
# SPDX-License-Identifier: BSD-3-Clause
|
||
|
|
|
||
|
|
include(CheckCCompilerFlag)
|
||
|
|
|
||
|
|
option(ENABLE_WERROR "Turn compiler warnings into errors" OFF)
|
||
|
|
option(PICKY_COMPILER "Enable picky compiler options" ON)
|
||
|
|
|
||
|
|
if(ENABLE_WERROR)
|
||
|
|
if(MSVC)
|
||
|
|
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /WX")
|
||
|
|
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /WX")
|
||
|
|
else() # llvm/clang and gcc style options
|
||
|
|
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror")
|
||
|
|
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror")
|
||
|
|
endif()
|
||
|
|
endif()
|
||
|
|
|
||
|
|
if(MSVC)
|
||
|
|
# Use the highest warning level for Visual Studio.
|
||
|
|
if(PICKY_COMPILER)
|
||
|
|
if(CMAKE_CXX_FLAGS MATCHES "[/-]W[0-4]")
|
||
|
|
string(REGEX REPLACE "[/-]W[0-4]" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
|
||
|
|
else()
|
||
|
|
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4")
|
||
|
|
endif()
|
||
|
|
if(CMAKE_C_FLAGS MATCHES "[/-]W[0-4]")
|
||
|
|
string(REGEX REPLACE "[/-]W[0-4]" "/W4" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
|
||
|
|
else()
|
||
|
|
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /W4")
|
||
|
|
endif()
|
||
|
|
endif()
|
||
|
|
elseif(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR CMAKE_C_COMPILER_ID MATCHES "Clang")
|
||
|
|
|
||
|
|
# https://clang.llvm.org/docs/DiagnosticsReference.html
|
||
|
|
# https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
|
||
|
|
|
||
|
|
if(NOT CMAKE_CXX_FLAGS MATCHES "-Wall")
|
||
|
|
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
|
||
|
|
endif()
|
||
|
|
if(NOT CMAKE_C_FLAGS MATCHES "-Wall")
|
||
|
|
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")
|
||
|
|
endif()
|
||
|
|
|
||
|
|
if(PICKY_COMPILER)
|
||
|
|
|
||
|
|
# WPICKY_ENABLE = Options we want to enable as-is.
|
||
|
|
# WPICKY_DETECT = Options we want to test first and enable if available.
|
||
|
|
|
||
|
|
# Prefer the -Wextra alias with clang.
|
||
|
|
if(CMAKE_C_COMPILER_ID MATCHES "Clang")
|
||
|
|
set(WPICKY_ENABLE "-Wextra")
|
||
|
|
else()
|
||
|
|
set(WPICKY_ENABLE "-W")
|
||
|
|
endif()
|
||
|
|
|
||
|
|
list(APPEND WPICKY_ENABLE
|
||
|
|
-pedantic
|
||
|
|
)
|
||
|
|
|
||
|
|
if(ENABLE_WERROR)
|
||
|
|
list(APPEND WPICKY_ENABLE
|
||
|
|
-pedantic-errors
|
||
|
|
)
|
||
|
|
endif()
|
||
|
|
|
||
|
|
# ----------------------------------
|
||
|
|
# Add new options here, if in doubt:
|
||
|
|
# ----------------------------------
|
||
|
|
set(WPICKY_DETECT
|
||
|
|
)
|
||
|
|
|
||
|
|
# Assume these options always exist with both clang and gcc.
|
||
|
|
# Require clang 3.0 / gcc 2.95 or later.
|
||
|
|
list(APPEND WPICKY_ENABLE
|
||
|
|
-Wbad-function-cast # clang 2.7 gcc 2.95
|
||
|
|
-Wconversion # clang 2.7 gcc 2.95
|
||
|
|
-Winline # clang 1.0 gcc 1.0
|
||
|
|
-Wmissing-declarations # clang 1.0 gcc 2.7
|
||
|
|
-Wmissing-prototypes # clang 1.0 gcc 1.0
|
||
|
|
-Wnested-externs # clang 1.0 gcc 2.7
|
||
|
|
-Wno-long-long # clang 1.0 gcc 2.95
|
||
|
|
-Wno-multichar # clang 1.0 gcc 2.95
|
||
|
|
-Wpointer-arith # clang 1.0 gcc 1.4
|
||
|
|
-Wshadow # clang 1.0 gcc 2.95
|
||
|
|
-Wsign-compare # clang 1.0 gcc 2.95
|
||
|
|
-Wundef # clang 1.0 gcc 2.95
|
||
|
|
-Wunused # clang 1.1 gcc 2.95
|
||
|
|
-Wwrite-strings # clang 1.0 gcc 1.4
|
||
|
|
)
|
||
|
|
|
||
|
|
# Always enable with clang, version dependent with gcc
|
||
|
|
set(WPICKY_COMMON_OLD
|
||
|
|
-Waddress # clang 2.7 gcc 4.3
|
||
|
|
-Wattributes # clang 2.7 gcc 4.1
|
||
|
|
-Wcast-align # clang 1.0 gcc 4.2
|
||
|
|
-Wdeclaration-after-statement # clang 1.0 gcc 3.4
|
||
|
|
-Wdiv-by-zero # clang 2.7 gcc 4.1
|
||
|
|
-Wempty-body # clang 2.7 gcc 4.3
|
||
|
|
-Wendif-labels # clang 1.0 gcc 3.3
|
||
|
|
-Wfloat-equal # clang 1.0 gcc 2.96 (3.0)
|
||
|
|
-Wformat-security # clang 2.7 gcc 4.1
|
||
|
|
-Wignored-qualifiers # clang 2.8 gcc 4.3
|
||
|
|
-Wmissing-field-initializers # clang 2.7 gcc 4.1
|
||
|
|
-Wmissing-noreturn # clang 2.7 gcc 4.1
|
||
|
|
-Wno-format-nonliteral # clang 1.0 gcc 2.96 (3.0)
|
||
|
|
-Wno-system-headers # clang 1.0 gcc 3.0
|
||
|
|
# -Wpadded # clang 2.9 gcc 4.1 # Not used because we cannot change public structs
|
||
|
|
-Wold-style-definition # clang 2.7 gcc 3.4
|
||
|
|
-Wredundant-decls # clang 2.7 gcc 4.1
|
||
|
|
-Wsign-conversion # clang 2.9 gcc 4.3
|
||
|
|
-Wno-error=sign-conversion # FIXME
|
||
|
|
-Wstrict-prototypes # clang 1.0 gcc 3.3
|
||
|
|
# -Wswitch-enum # clang 2.7 gcc 4.1 # Not used because this basically disallows default case
|
||
|
|
-Wtype-limits # clang 2.7 gcc 4.3
|
||
|
|
-Wunreachable-code # clang 2.7 gcc 4.1
|
||
|
|
-Wunused-macros # clang 2.7 gcc 4.1
|
||
|
|
-Wunused-parameter # clang 2.7 gcc 4.1
|
||
|
|
-Wvla # clang 2.8 gcc 4.3
|
||
|
|
)
|
||
|
|
|
||
|
|
set(WPICKY_COMMON
|
||
|
|
-Wdouble-promotion # clang 3.6 gcc 4.6 appleclang 6.3
|
||
|
|
-Wenum-conversion # clang 3.2 gcc 10.0 appleclang 4.6 g++ 11.0
|
||
|
|
-Wpragmas # clang 3.5 gcc 4.1 appleclang 6.0
|
||
|
|
-Wunused-const-variable # clang 3.4 gcc 6.0 appleclang 5.1
|
||
|
|
)
|
||
|
|
|
||
|
|
if(CMAKE_C_COMPILER_ID MATCHES "Clang")
|
||
|
|
list(APPEND WPICKY_ENABLE
|
||
|
|
${WPICKY_COMMON_OLD}
|
||
|
|
-Wshift-sign-overflow # clang 2.9
|
||
|
|
-Wshorten-64-to-32 # clang 1.0
|
||
|
|
-Wlanguage-extension-token # clang 3.0
|
||
|
|
-Wformat=2 # clang 3.0 gcc 4.8
|
||
|
|
)
|
||
|
|
# Enable based on compiler version
|
||
|
|
if((CMAKE_C_COMPILER_ID STREQUAL "Clang" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.6) OR
|
||
|
|
(CMAKE_C_COMPILER_ID STREQUAL "AppleClang" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 6.3))
|
||
|
|
list(APPEND WPICKY_ENABLE
|
||
|
|
${WPICKY_COMMON}
|
||
|
|
-Wunreachable-code-break # clang 3.5 appleclang 6.0
|
||
|
|
-Wheader-guard # clang 3.4 appleclang 5.1
|
||
|
|
-Wsometimes-uninitialized # clang 3.2 appleclang 4.6
|
||
|
|
)
|
||
|
|
endif()
|
||
|
|
if((CMAKE_C_COMPILER_ID STREQUAL "Clang" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.9) OR
|
||
|
|
(CMAKE_C_COMPILER_ID STREQUAL "AppleClang" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 8.3))
|
||
|
|
list(APPEND WPICKY_ENABLE
|
||
|
|
-Wcomma # clang 3.9 appleclang 8.3
|
||
|
|
-Wmissing-variable-declarations # clang 3.2 appleclang 4.6
|
||
|
|
)
|
||
|
|
endif()
|
||
|
|
if((CMAKE_C_COMPILER_ID STREQUAL "Clang" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 7.0) OR
|
||
|
|
(CMAKE_C_COMPILER_ID STREQUAL "AppleClang" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 10.3))
|
||
|
|
list(APPEND WPICKY_ENABLE
|
||
|
|
-Wassign-enum # clang 7.0 appleclang 10.3
|
||
|
|
-Wextra-semi-stmt # clang 7.0 appleclang 10.3
|
||
|
|
)
|
||
|
|
endif()
|
||
|
|
if((CMAKE_C_COMPILER_ID STREQUAL "Clang" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 10.0) OR
|
||
|
|
(CMAKE_C_COMPILER_ID STREQUAL "AppleClang" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 12.4))
|
||
|
|
list(APPEND WPICKY_ENABLE
|
||
|
|
-Wimplicit-fallthrough # clang 4.0 gcc 7.0 appleclang 12.4 # we have silencing markup for clang 10.0 and above only
|
||
|
|
)
|
||
|
|
endif()
|
||
|
|
else() # gcc
|
||
|
|
list(APPEND WPICKY_DETECT
|
||
|
|
${WPICKY_COMMON}
|
||
|
|
)
|
||
|
|
# Enable based on compiler version
|
||
|
|
if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.3)
|
||
|
|
list(APPEND WPICKY_ENABLE
|
||
|
|
${WPICKY_COMMON_OLD}
|
||
|
|
-Wclobbered # gcc 4.3
|
||
|
|
-Wmissing-parameter-type # gcc 4.3
|
||
|
|
-Wold-style-declaration # gcc 4.3
|
||
|
|
-Wstrict-aliasing=3 # gcc 4.0
|
||
|
|
-Wtrampolines # gcc 4.3
|
||
|
|
)
|
||
|
|
endif()
|
||
|
|
if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.5 AND MINGW)
|
||
|
|
list(APPEND WPICKY_ENABLE
|
||
|
|
-Wno-pedantic-ms-format # gcc 4.5 (mingw-only)
|
||
|
|
)
|
||
|
|
endif()
|
||
|
|
if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.8)
|
||
|
|
list(APPEND WPICKY_ENABLE
|
||
|
|
-Wformat=2 # clang 3.0 gcc 4.8
|
||
|
|
)
|
||
|
|
endif()
|
||
|
|
if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 5.0)
|
||
|
|
list(APPEND WPICKY_ENABLE
|
||
|
|
-Warray-bounds=2 -ftree-vrp # clang 3.0 gcc 5.0 (clang default: -Warray-bounds)
|
||
|
|
)
|
||
|
|
endif()
|
||
|
|
if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 6.0)
|
||
|
|
list(APPEND WPICKY_ENABLE
|
||
|
|
-Wduplicated-cond # gcc 6.0
|
||
|
|
-Wnull-dereference # clang 3.0 gcc 6.0 (clang default)
|
||
|
|
-fdelete-null-pointer-checks
|
||
|
|
-Wshift-negative-value # clang 3.7 gcc 6.0 (clang default)
|
||
|
|
-Wshift-overflow=2 # clang 3.0 gcc 6.0 (clang default: -Wshift-overflow)
|
||
|
|
)
|
||
|
|
endif()
|
||
|
|
if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 7.0)
|
||
|
|
list(APPEND WPICKY_ENABLE
|
||
|
|
-Walloc-zero # gcc 7.0
|
||
|
|
-Wduplicated-branches # gcc 7.0
|
||
|
|
-Wformat-overflow=2 # gcc 7.0
|
||
|
|
-Wformat-truncation=2 # gcc 7.0
|
||
|
|
-Wimplicit-fallthrough # clang 4.0 gcc 7.0
|
||
|
|
-Wrestrict # gcc 7.0
|
||
|
|
)
|
||
|
|
endif()
|
||
|
|
if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 10.0)
|
||
|
|
list(APPEND WPICKY_ENABLE
|
||
|
|
-Warith-conversion # gcc 10.0
|
||
|
|
)
|
||
|
|
endif()
|
||
|
|
endif()
|
||
|
|
|
||
|
|
#
|
||
|
|
|
||
|
|
unset(WPICKY)
|
||
|
|
|
||
|
|
foreach(_CCOPT IN LISTS WPICKY_ENABLE)
|
||
|
|
set(WPICKY "${WPICKY} ${_CCOPT}")
|
||
|
|
endforeach()
|
||
|
|
|
||
|
|
foreach(_CCOPT IN LISTS WPICKY_DETECT)
|
||
|
|
# surprisingly, CHECK_C_COMPILER_FLAG needs a new variable to store each new
|
||
|
|
# test result in.
|
||
|
|
string(MAKE_C_IDENTIFIER "OPT${_CCOPT}" _optvarname)
|
||
|
|
# GCC only warns about unknown -Wno- options if there are also other diagnostic messages,
|
||
|
|
# so test for the positive form instead
|
||
|
|
string(REPLACE "-Wno-" "-W" _CCOPT_ON "${_CCOPT}")
|
||
|
|
check_c_compiler_flag(${_CCOPT_ON} ${_optvarname})
|
||
|
|
if(${_optvarname})
|
||
|
|
set(WPICKY "${WPICKY} ${_CCOPT}")
|
||
|
|
endif()
|
||
|
|
endforeach()
|
||
|
|
|
||
|
|
message(STATUS "Picky compiler options:${WPICKY}")
|
||
|
|
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${WPICKY}")
|
||
|
|
endif()
|
||
|
|
endif()
|