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# ngtcp2
#
# Copyright (c) 2023 ngtcp2 contributors
#
# 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.
# C
include(CheckCCompilerFlag)
if(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
# 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
-Wall
)
# ----------------------------------
# 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
-Wconversion # clang 3.0 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
-Wpointer-arith # clang 1.0 gcc 1.4
-Wshadow # clang 1.0 gcc 2.95
-Wundef # clang 1.0 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 3.0 gcc 4.3
-Wattributes # clang 3.0 gcc 4.1
-Wcast-align # clang 1.0 gcc 4.2
-Wdeclaration-after-statement # clang 1.0 gcc 3.4
-Wdiv-by-zero # clang 3.0 gcc 4.1
-Wempty-body # clang 3.0 gcc 4.3
-Wendif-labels # clang 1.0 gcc 3.3
-Wfloat-equal # clang 1.0 gcc 2.96 (3.0)
-Wformat-nonliteral # clang 3.0 gcc 4.1
-Wformat-security # clang 3.0 gcc 4.1
-Wmissing-field-initializers # clang 3.0 gcc 4.1
-Wmissing-noreturn # clang 3.0 gcc 4.1
-Wno-format-nonliteral # clang 1.0 gcc 2.96 (3.0) # This is required because we pass format string as "const char*"
# -Wpadded # clang 3.0 gcc 4.1 # Not used because we cannot change public structs
-Wredundant-decls # clang 3.0 gcc 4.1
-Wsign-conversion # clang 3.0 gcc 4.3
-Wstrict-prototypes # clang 1.0 gcc 3.3
# -Wswitch-enum # clang 3.0 gcc 4.1 # Not used because this basically disallows default case
-Wunreachable-code # clang 3.0 gcc 4.1
-Wunused-macros # clang 3.0 gcc 4.1
-Wunused-parameter # clang 3.0 gcc 4.1
-Wvla # clang 2.8 gcc 4.3
)
set(WPICKY_COMMON
-Wpragmas # clang 3.5 gcc 4.1 appleclang 6.0
)
if(CMAKE_C_COMPILER_ID MATCHES "Clang")
list(APPEND WPICKY_ENABLE
${WPICKY_COMMON_OLD}
-Wshorten-64-to-32 # clang 1.0
-Wlanguage-extension-token # clang 3.0
)
# 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
-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
)
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
${WPICKY_COMMON_OLD}
-Wclobbered # gcc 4.3
)
endif()
if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 7.0)
list(APPEND WPICKY_ENABLE
-Wduplicated-branches # gcc 7.0
)
endif()
endif()
#
unset(_wpicky)
foreach(_CCOPT IN LISTS WPICKY_ENABLE)
set(_wpicky "${_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} ${_CCOPT}")
endif()
endforeach()
set(WARNCFLAGS "${WARNCFLAGS} ${_wpicky}")
endif()
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