Commit 786dddc0 authored by Cristian Adam (ooo until 18 Nov)'s avatar Cristian Adam (ooo until 18 Nov) Committed by Brad King

Add option to build CMake itself with IPO/LTO

Create a `CMake_BUILD_LTO` option when building with a CMake that
is new enough to support `CheckIPOSupported` everywhere.
parent 53e65e8e
......@@ -117,6 +117,18 @@ option(CMake_BUILD_DEVELOPER_REFERENCE
"Build CMake Developer Reference" OFF)
mark_as_advanced(CMake_BUILD_DEVELOPER_REFERENCE)
# option to build using interprocedural optimizations (IPO/LTO)
if (NOT CMAKE_VERSION VERSION_LESS 3.12.2)
option(CMake_BUILD_LTO "Compile CMake with link-time optimization if supported" OFF)
if(CMake_BUILD_LTO)
include(CheckIPOSupported)
check_ipo_supported(RESULT HAVE_IPO)
if(HAVE_IPO)
set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
endif()
endif()
endif()
#-----------------------------------------------------------------------
# a macro to deal with system libraries, implemented as a macro
# simply to improve readability of the main script
......
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