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cmake: Accept "thin" or "full" as arguments to -DLLVM_ENABLE_LTO

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Mehdi suggested in a review of r259766 that it's also useful to easily
set the type of LTO. Augment the cmake variable to support that.

llvm-svn: 260143
This commit is contained in:
Justin Bogner 2016-02-08 21:01:24 +00:00
parent 5f473ff0ae
commit 974dab4e8f
2 changed files with 16 additions and 9 deletions
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18
cmake/modules/HandleLLVMOptions.cmake
View File

@ -656,12 +656,18 @@ append_if(LLVM_BUILD_INSTRUMENTED "-fprofile-instr-generate"
CMAKE_EXE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS)
option(LLVM_ENABLE_LTO "Enable link-time optimization" OFF)
append_if(LLVM_ENABLE_LTO "-flto"
CMAKE_CXX_FLAGS
CMAKE_C_FLAGS
CMAKE_EXE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS)
option(LLVM_ENABLE_LTO "Build LLVM with LTO. May be specified as Thin or Full to use a particular kind of LTO" OFF)
string(TOUPPER "${LLVM_ENABLE_LTO}" uppercase_LLVM_ENABLE_LTO)
if(uppercase_LLVM_ENABLE_LTO STREQUAL "THIN")
append("-flto=thin" CMAKE_CXX_FLAGS CMAKE_C_FLAGS
CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
elseif(uppercase_LLVM_ENABLE_LTO STREQUAL "FULL")
append("-flto=full" CMAKE_CXX_FLAGS CMAKE_C_FLAGS
CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
elseif(LLVM_ENABLE_LTO)
append("-flto" CMAKE_CXX_FLAGS CMAKE_C_FLAGS
CMAKE_EXE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
endif()
# Plugin support
# FIXME: Make this configurable.

7
docs/CMake.rst
View File

@ -351,9 +351,10 @@ LLVM-specific variables
are ``Address``, ``Memory``, ``MemoryWithOrigins``, ``Undefined``, ``Thread``,
and ``Address;Undefined``. Defaults to empty string.
**LLVM_ENABLE_LTO**:BOOL
Add the ``-flto`` flag to the compile and link command lines,
enabling link-time optimization. Defaults to OFF.
**LLVM_ENABLE_LTO**:STRING
Add ``-flto`` or ``-flto=`` flags to the compile and link command
lines, enabling link-time optimization. Possible values are ``Off``,
``On``, ``Thin`` and ``Full``. Defaults to OFF.
**LLVM_PARALLEL_COMPILE_JOBS**:STRING
Define the maximum number of concurrent compilation jobs.