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