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cmake: set warning and error options

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The set is far from perfect, but guards against common errors with GCC.
This commit is contained in:
Eugene Shalygin 2017-04-27 14:35:28 +02:00 • committed by sledgehammer999
commit 44f81a2d2b
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9 changed files with 147 additions and 7 deletions
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49
cmake/Modules/MacroGlibcDetect.cmake Normal file
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###############################################################
#
# Copyright 2011 Red Hat, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you
# may not use this file except in compliance with the License. You may
# obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
###############################################################
MACRO (GLIBC_DETECT _VERSION)
# there are multiple ways to detect glibc, but given nmi's
# cons'd up paths I will trust only gcc. I guess I could also use
# ldd --version to detect.
set(_GLIB_SOURCE_DETECT "
#include <limits.h>
#include <stdio.h>
int main()
{
printf(\"%d%d\",__GLIBC__, __GLIBC_MINOR__);
return 0;
}
")
file (WRITE ${CMAKE_CURRENT_BINARY_DIR}/build/cmake/glibc.cpp "${_GLIB_SOURCE_DETECT}\n")
try_run(POST26_GLIBC_DETECTED
POST26_GLIBC_COMPILE
${CMAKE_CURRENT_BINARY_DIR}/build/cmake
${CMAKE_CURRENT_BINARY_DIR}/build/cmake/glibc.cpp
RUN_OUTPUT_VARIABLE GLIBC_VERSION )
if (GLIBC_VERSION AND POST26_GLIBC_COMPILE )
set(${_VERSION} ${GLIBC_VERSION})
else()
message(STATUS "NOTE: Could not detect GLIBC_VERSION from compiler")
endif()
ENDMACRO (GLIBC_DETECT)

89
cmake/Modules/MacroQbtCompilerSettings.cmake Normal file
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# Sets cache variable QBT_ADDITONAL_FLAGS and QBT_ADDITONAL_CXX_FLAGS to list of additional
# compiler flags for C and C++ (QBT_ADDITONAL_FLAGS) and for C++ only (QBT_ADDITONAL_CXX_FLAGS)
# and appends them to CMAKE_XXX_FLAGS variables.
# It could use add_compile_options(), but then it is needed to use generator expressions,
# and most interesting of them are not compatible with Visual Studio :(
macro(qbt_set_compiler_options)
# if (NOT QBT_ADDITONAL_FLAGS)
if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
#-Wshadow -Wconversion ?
set(_GCC_COMMON_C_AND_CXX_FLAGS "-Wall -Wextra"
"-Wfloat-equal -Wcast-qual -Wcast-align"
"-Wsign-conversion -Winvalid-pch -Werror=return-type -Wno-long-long"
# -fstack-protector-all
"-Werror -Wno-error=deprecated-declarations"
)
set (_GCC_COMMON_CXX_FLAGS "-fexceptions -frtti"
"-Woverloaded-virtual -Wold-style-cast -Wstrict-null-sentinel"
"-Wnon-virtual-dtor -Wfloat-equal -Wcast-qual -Wcast-align"
"-Werror=overloaded-virtual"
# "-Weffc++"
"-Werror -Wno-error=cpp"
# we should modify code to make these ones obsolete
"-Wno-error=old-style-cast -Wno-error=sign-conversion -Wno-error=float-equal"
)
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)
# GCC 4.8 has problems with std::array and its initialization
list(APPEND _GCC_COMMON_CXX_FLAGS "-Wno-error=missing-field-initializers")
endif()
include(CheckCXXCompilerFlag)
# check for -pedantic
check_cxx_compiler_flag(-pedantic _PEDANTIC_IS_SUPPORTED)
if (_PEDANTIC_IS_SUPPORTED)
list(APPEND _GCC_COMMON_CXX_FLAGS "-pedantic -pedantic-errors")
else (_PEDANTIC_IS_SUPPORTED)
list(APPEND _GCC_COMMON_CXX_FLAGS "-Wpedantic")
endif (_PEDANTIC_IS_SUPPORTED)
if (CMAKE_SYSTEM_NAME MATCHES Linux)
# if Glibc version is 2.20 or higher, set -D_DEFAULT_SOURCE
include(MacroGlibcDetect)
message(STATUS "Detecting Glibc version...")
glibc_detect(GLIBC_VERSION)
if(${GLIBC_VERSION})
if(GLIBC_VERSION LESS "220")
message(STATUS "Glibc version is ${GLIBC_VERSION}")
else(GLIBC_VERSION LESS "220")
message(STATUS "Glibc version is ${GLIBC_VERSION}, adding -D_DEFAULT_SOURCE")
add_definitions(-D_DEFAULT_SOURCE)
endif(GLIBC_VERSION LESS "220")
endif(${GLIBC_VERSION})
endif (CMAKE_SYSTEM_NAME MATCHES Linux)
string(REPLACE ";" " " _GCC_COMMON_C_AND_CXX_FLAGS_STRING "${_GCC_COMMON_C_AND_CXX_FLAGS}")
string(REPLACE ";" " " _GCC_COMMON_CXX_FLAGS_STRING "${_GCC_COMMON_CXX_FLAGS}")
string(APPEND CMAKE_C_FLAGS " ${_GCC_COMMON_C_AND_CXX_FLAGS_STRING}")
string(APPEND CMAKE_CXX_FLAGS " ${_GCC_COMMON_C_AND_CXX_FLAGS_STRING} ${_GCC_COMMON_CXX_FLAGS_STRING}")
set(QBT_ADDITONAL_FLAGS "${_GCC_COMMON_C_AND_CXX_FLAGS_STRING}" CACHE STRING
"Additional qBittorent compile flags" FORCE)
set(QBT_ADDITONAL_CXX_FLAGS "${_GCC_COMMON_CXX_FLAGS_STRING}" CACHE STRING
"Additional qBittorent C++ compile flags" FORCE)
# check whether we can enable -Og optimization for debug build
# also let's enable -march=native for debug builds
check_cxx_compiler_flag(-Og _DEBUG_OPTIMIZATION_LEVEL_IS_SUPPORTED)
if (_DEBUG_OPTIMIZATION_LEVEL_IS_SUPPORTED)
string(APPEND CMAKE_C_FLAGS_DEBUG " -Og -g3 -march=native -pipe" )
string(APPEND CMAKE_CXX_FLAGS_DEBUG " -Og -g3 -march=native -pipe" )
else(_DEBUG_OPTIMIZATION_LEVEL_IS_SUPPORTED)
string(APPEND CMAKE_C_FLAGS_DEBUG " -O0 -g3 -march=native -pipe" )
string(APPEND CMAKE_CXX_FLAGS_DEBUG " -O0 -g3 -march=native -pipe" )
endif (_DEBUG_OPTIMIZATION_LEVEL_IS_SUPPORTED)
endif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
set(QBT_ADDITONAL_FLAGS "-wd4290 -wd4275 -wd4251 /W4" CACHE STRING "Additional qBittorent compile flags")
string(APPEND CMAKE_C_FLAGS " ${QBT_ADDITONAL_FLAGS}")
string(APPEND CMAKE_CXX_FLAGS " ${QBT_ADDITONAL_FLAGS}")
endif ()
# endif (NOT QBT_ADDITONAL_FLAGS)
endmacro(qbt_set_compiler_options)