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Compile with link time optimisation

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Can provide speed improvements
This commit is contained in:
Matt Clarkson 2015-04-30 14:10:52 +01:00
parent 7418bbbbac
commit bb23a9b9f2
1 changed files with 17 additions and 0 deletions
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17
CMakeLists.txt
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@ -2,6 +2,7 @@ cmake_minimum_required (VERSION 2.8.11)
project (benchmark)
option(BENCHMARK_ENABLE_TESTING "Enable testing of the benchmark library." ON)
option(BENCHMARK_ENABLE_LTO "Enable link time optimisation of the benchmark library." OFF)
# Make sure we can import out CMake functions
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
@ -41,9 +42,25 @@ add_cxx_compiler_flag(-pedantic-errors)
add_cxx_compiler_flag(-Wshorten-64-to-32)
add_cxx_compiler_flag(-Wfloat-equal)
add_cxx_compiler_flag(-Wzero-as-null-pointer-constant)
# Release flags
add_cxx_compiler_flag(-fno-strict-aliasing RELEASE)
# Link time optimisation
if (BENCHMARK_ENABLE_LTO)
add_cxx_compiler_flag(-flto)
if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
find_program(GCC_AR gcc-ar)
if (GCC_AR)
set(CMAKE_AR ${GCC_AR})
endif()
find_program(GCC_RANLIB gcc-ranlib)
if (GCC_RANLIB)
set(CMAKE_RANLIB ${GCC_RANLIB})
endif()
endif()
endif()
add_cxx_compiler_flag(-Wthread-safety)
if (HAVE_WTHREAD_SAFETY)
add_definitions(-DHAVE_WTHREAD_SAFETY)