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Add support for -DLLVM_ENABLE_LTO #7

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May 1, 2016
Merged

Add support for -DLLVM_ENABLE_LTO #7

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cfb459a
cmake: Add a flag to enable LTO
bogner Feb 4, 2016
128319f
cmake: Accept "thin" or "full" as arguments to -DLLVM_ENABLE_LTO
bogner Feb 8, 2016
a4b7bbb
cmake: Use "set" instead of "option" for LLVM_ENABLE_LTO
bogner Feb 8, 2016
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13 changes: 13 additions & 0 deletions cmake/modules/HandleLLVMOptions.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -635,6 +635,19 @@ append_if(LLVM_BUILD_INSTRUMENTED "-fprofile-instr-generate"
CMAKE_EXE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS)

set(LLVM_ENABLE_LTO OFF CACHE STRING "Build LLVM with LTO. May be specified as Thin or Full to use a particular kind of LTO")
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.
if(WIN32 OR CYGWIN)
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5 changes: 5 additions & 0 deletions docs/CMake.rst
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Expand Up @@ -347,6 +347,11 @@ LLVM-specific variables
are ``Address``, ``Memory``, ``MemoryWithOrigins``, ``Undefined``, ``Thread``,
and ``Address;Undefined``. Defaults to empty string.

**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.

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