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211 lines
9.3 KiB
211 lines
9.3 KiB
#=============================================================================
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# Copyright 2015 Luís Pereira <luis.artur.pereira@gmail.com>
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# Copyright 2015 Palo Kisa <palo.kisa@gmail.com>
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# Copyright 2013 Hong Jen Yee (PCMan) <pcman.tw@gmail.com>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. The name of the author may not be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#=============================================================================
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#-----------------------------------------------------------------------------
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# Build with release mode by default (turn on compiler optimizations)
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#-----------------------------------------------------------------------------
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if (NOT CMAKE_BUILD_TYPE)
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set(CMAKE_BUILD_TYPE Release)
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endif()
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#-----------------------------------------------------------------------------
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# Honor visibility properties for all target types.
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#
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# The ``<LANG>_VISIBILITY_PRESET`` and
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# ``VISIBILITY_INLINES_HIDDEN`` target properties affect visibility
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# of symbols during dynamic linking. When first introduced these properties
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# affected compilation of sources only in shared libraries, module libraries,
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# and executables with the ``ENABLE_EXPORTS`` property set. This
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# was sufficient for the basic use cases of shared libraries and executables
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# with plugins. However, some sources may be compiled as part of static
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# libraries or object libraries and then linked into a shared library later.
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# CMake 3.3 and above prefer to honor these properties for sources compiled
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# in all target types. This policy preserves compatibility for projects
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# expecting the properties to work only for some target types.
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#
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# The ``OLD`` behavior for this policy is to ignore the visibility properties
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# for static libraries, object libraries, and executables without exports.
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# The ``NEW`` behavior for this policy is to honor the visibility properties
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# for all target types.
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#
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# This policy was introduced in CMake version 3.3. CMake version
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# 3.3.0 warns when the policy is not set and uses ``OLD`` behavior. Use
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# the ``cmake_policy()`` command to set it to ``OLD`` or ``NEW``
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# explicitly.
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#-----------------------------------------------------------------------------
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if(COMMAND CMAKE_POLICY)
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if (POLICY CMP0063)
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cmake_policy(SET CMP0063 NEW)
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endif()
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endif()
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include(CheckCXXCompilerFlag)
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#-----------------------------------------------------------------------------
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# Global definitions
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#-----------------------------------------------------------------------------
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add_definitions(
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-DQT_USE_QSTRINGBUILDER
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)
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#-----------------------------------------------------------------------------
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# Detect Clang compiler
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#-----------------------------------------------------------------------------
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if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
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set(LXQT_COMPILER_IS_CLANGCXX 1)
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endif()
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#-----------------------------------------------------------------------------
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# Set visibility to hidden to hide symbols, unless they're exported manually
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# in the code
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#-----------------------------------------------------------------------------
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set(CMAKE_CXX_VISIBILITY_PRESET hidden)
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set(CMAKE_VISIBILITY_INLINES_HIDDEN 1)
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#-----------------------------------------------------------------------------
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# Disable exceptions
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#-----------------------------------------------------------------------------
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if (CMAKE_COMPILER_IS_GNUCXX OR LXQT_COMPILER_IS_CLANGCXX)
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions")
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endif()
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#-----------------------------------------------------------------------------
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# Common warning flags
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#-----------------------------------------------------------------------------
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set(__LXQT_COMMON_WARNING_FLAGS "-Wall -Wextra -Wchar-subscripts -Wno-long-long -Wpointer-arith -Wundef -Wformat-security")
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#-----------------------------------------------------------------------------
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# Warning flags
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#-----------------------------------------------------------------------------
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if (CMAKE_COMPILER_IS_GNUCXX OR LXQT_COMPILER_IS_CLANGCXX)
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${__LXQT_COMMON_WARNING_FLAGS} -Wnon-virtual-dtor -Woverloaded-virtual -Wpedantic")
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endif()
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if (LXQT_COMPILER_IS_CLANGCXX)
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# qCDebug(), qCWarning, etc trigger a very verbose warning, about.... nothing. Disable it.
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# Found when building lxqt-session.
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-gnu-zero-variadic-macro-arguments")
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endif()
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#-----------------------------------------------------------------------------
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# Linker flags
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# Do not allow undefined symbols
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#-----------------------------------------------------------------------------
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if (CMAKE_COMPILER_IS_GNUCXX OR LXQT_COMPILER_IS_CLANGCXX)
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# -Bsymbolic-functions: replace dynamic symbols used internally in
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# shared libs with direct addresses.
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set(SYMBOLIC_FLAGS
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"-Wl,-Bsymbolic-functions -Wl,-Bsymbolic"
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)
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set(CMAKE_SHARED_LINKER_FLAGS
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"-Wl,--no-undefined ${SYMBOLIC_FLAGS} ${CMAKE_SHARED_LINKER_FLAGS}"
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)
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set(CMAKE_MODULE_LINKER_FLAGS
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"-Wl,--no-undefined ${SYMBOLIC_FLAGS} ${CMAKE_MODULE_LINKER_FLAGS}"
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)
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set(CMAKE_EXE_LINKER_FLAGS
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"${SYMBOLIC_FLAGS} ${CMAKE_EXE_LINKER_FLAGS}"
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)
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endif()
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#-----------------------------------------------------------------------------
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# Turn on more aggrassive optimizations not supported by CMake
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# References: https://wiki.qt.io/Performance_Tip_Startup_Time
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#-----------------------------------------------------------------------------
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if (CMAKE_COMPILER_IS_GNUCXX OR LXQT_COMPILER_IS_CLANGCXX)
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# -flto: use link-time optimizations to generate more efficient code
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if (CMAKE_COMPILER_IS_GNUCXX)
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set(LTO_FLAGS "-flto -fuse-linker-plugin")
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# When building static libraries with LTO in gcc >= 4.9,
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# "gcc-ar" and "gcc-ranlib" should be used instead of "ar" and "ranlib".
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# references:
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# https://gcc.gnu.org/gcc-4.9/changes.html
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# http://hubicka.blogspot.tw/2014/04/linktime-optimization-in-gcc-2-firefox.html
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# https://github.com/monero-project/monero/pull/1065/commits/1855213c8fb8f8727f4107716aab8e7ba826462b
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if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.9.0") # gcc >= 4.9
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set(CMAKE_AR "gcc-ar")
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set(CMAKE_RANLIB "gcc-ranlib")
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endif()
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elseif (LXQT_COMPILER_IS_CLANGCXX)
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# The link-time optimization of clang++/llvm seems to be too aggrassive.
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# After testing, it breaks the signal/slots of QObject sometimes.
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# So disable it for now until there is a solution.
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# set(LTO_FLAGS "-flto")
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endif()
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# apply these options to "Release" build type only
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set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${LTO_FLAGS}")
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endif()
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#-----------------------------------------------------------------------------
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# CXX11 and CXX0X requirements
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#-----------------------------------------------------------------------------
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CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
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CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
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if(COMPILER_SUPPORTS_CXX11)
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
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elseif(COMPILER_SUPPORTS_CXX0X)
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
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else()
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message(FATAL "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. C++11 support is required")
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endif()
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#-----------------------------------------------------------------------------
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# Enable colored diagnostics for the CLang/Ninja combination
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#-----------------------------------------------------------------------------
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if (LXQT_COMPILER_IS_CLANGCXX AND CMAKE_GENERATOR STREQUAL "Ninja")
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fcolor-diagnostics")
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fcolor-diagnostics")
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endif()
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#-----------------------------------------------------------------------------
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# Enable exceptions for an target
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#
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# lxqt_enable_target_exceptions(<target>
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# <INTERFACE|PUBLIC|PRIVATE>
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# )
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#
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#-----------------------------------------------------------------------------
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function(lxqt_enable_target_exceptions target mode)
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target_compile_options(${target} ${mode}
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"$<$<OR:$<CXX_COMPILER_ID:GNU>,$<CXX_COMPILER_ID:Clang>>:-fexceptions>"
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)
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endfunction()
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