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Added CMake option ENABLE_THINLTO #10585

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Alexey Milovidov 2020-05-02 16:50:57 +03:00
parent d763d0019b
commit d8e36a0789
1 changed files with 4 additions and 2 deletions
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6
CMakeLists.txt
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@ -30,7 +30,7 @@ set(CMAKE_LINK_DEPENDS_NO_SHARED 1) # Do not relink all depended targets on .so
set(CMAKE_CONFIGURATION_TYPES "RelWithDebInfo;Debug;Release;MinSizeRel" CACHE STRING "" FORCE)
set(CMAKE_DEBUG_POSTFIX "d" CACHE STRING "Generate debug library name with a postfix.") # To be consistent with CMakeLists from contrib libs.
option(ENABLE_IPO "Enable inter-procedural optimization (aka LTO)" OFF) # need cmake 3.9+
option(ENABLE_IPO "Enable full link time optimization (it's usually impractical; see also ENABLE_THINLTO)" OFF) # need cmake 3.9+
if(ENABLE_IPO)
cmake_policy(SET CMP0069 NEW)
include(CheckIPOSupported)
@ -218,10 +218,12 @@ if (COMPILER_CLANG)
# Display absolute paths in error messages. Otherwise KDevelop fails to navigate to correct file and opens a new file instead.
set(COMPILER_FLAGS "${COMPILER_FLAGS} -fdiagnostics-absolute-paths")
option(ENABLE_THINLTO "Enable Thin LTO. Only applicable for clang. It's also suppressed when building with tests or sanitizers." ON)
# We cannot afford to use LTO when compiling unitests, and it's not enough
# to only supply -fno-lto at the final linking stage. So we disable it
# completely.
if (NOT ENABLE_TESTS AND NOT SANITIZE)
if (ENABLE_THINLTO AND NOT ENABLE_TESTS AND NOT SANITIZE)
# Link time optimization
set (CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO} -flto=thin")
set (CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -flto=thin")