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[CMake] [Darwin] Use libtool instead of ar && ranlib

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Summary: Using libtool instead of ar and ranlib on Darwin shaves a minute off my clang build. This is because on Darwin libtool is optimized to give hints to the kernel about filesystem interactions that allow it to be faster.

Reviewers: bogner, pete

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D19611

llvm-svn: 267930
This commit is contained in:
Chris Bieneman 2016-04-28 20:14:19 +00:00
parent 57a8fdd741
commit d575650867
1 changed files with 15 additions and 0 deletions
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15
CMakeLists.txt
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@ -56,6 +56,21 @@ project(LLVM
${cmake_3_0_LANGUAGES}
C CXX ASM)
if(APPLE)
if(NOT CMAKE_LIBTOOL)
find_program(CMAKE_LIBTOOL NAMES libtool)
endif()
if(CMAKE_LIBTOOL)
set(CMAKE_LIBTOOL ${CMAKE_LIBTOOL} CACHE PATH "libtool executable")
message(STATUS "Found libtool - ${CMAKE_LIBTOOL}")
get_property(languages GLOBAL PROPERTY ENABLED_LANGUAGES)
foreach(lang ${languages})
set(CMAKE_${lang}_CREATE_STATIC_LIBRARY
"${CMAKE_LIBTOOL} -static -o <TARGET> <LINK_FLAGS> <OBJECTS> ")
endforeach()
endif()
endif()
# The following only works with the Ninja generator in CMake >= 3.0.
set(LLVM_PARALLEL_COMPILE_JOBS "" CACHE STRING
"Define the maximum number of concurrent compilation jobs.")