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only use -flto when supported, quenched policy warnings

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Wenzel Jakob 2015-11-30 10:17:01 +01:00
parent 60c36db1c9
commit faaee1cbbd
1 changed files with 11 additions and 2 deletions
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13
CMakeLists.txt
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@ -27,14 +27,23 @@ set(Python_ADDITIONAL_VERSIONS 3.4 3.5 3.6)
find_package(PythonLibs ${PYBIND11_PYTHON_VERSION} REQUIRED)
find_package(PythonInterp ${PYBIND11_PYTHON_VERSION} REQUIRED)
if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
include(CheckCXXCompilerFlag)
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR CMAKE_CXX_COMPILER_ID MATCHES "GNU")
# Enable C++11 mode on C++ / Clang
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
# Enable link time optimization and set the default symbol
# visibility to hidden (very important to obtain small binaries)
if (NOT ${U_CMAKE_BUILD_TYPE} MATCHES DEBUG)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden -flto")
# Default symbol visibility
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden")
# Check for Link Time Optimization support
CHECK_CXX_COMPILER_FLAG("-flto" HAS_LTO_FLAG)
if (HAS_LTO_FLAG)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -flto")
endif()
endif()
endif()