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[CMake] Add support for link time optimization (LTO).

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This analogous to the `--optimize` flag in the Python/Makefile
build system except that we now support doing LTO with Clang/GCC
as well. However it is probably best to avoid doing LTO with
Clang or GCC for now because I see a bunch of warnings about
ODR violations when building with LTO.

LTO can be enabled with the new `LINK_TIME_OPTIMIZATION` option
which is off by default.
This commit is contained in:
Dan Liew 2017-04-29 01:21:49 +01:00
parent fb403229bd
commit 0e1343e78d
3 changed files with 58 additions and 0 deletions
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5
CMakeLists.txt
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@ -383,6 +383,11 @@ if (BUILD_LIBZ3_SHARED)
endif()
endif()
################################################################################
# Link time optimization
################################################################################
include(${CMAKE_SOURCE_DIR}/cmake/compiler_lto.cmake)
################################################################################
# Report default CMake flags
################################################################################