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Make binaries more compatible by default (#206)

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* Make binaries more compatible by default

Turn `-march=native` off by default. This makes binaries more portable,
but may harm performance. However, fast paths look unaltered

* Change setting to on if specified.
This commit is contained in:
Matthew Parkinson
2020-05-28 16:56:48 +01:00
committed by GitHub
parent 2c9ab3096d
commit 4c22c5b02f
1 changed files with 4 additions and 3 deletions
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7
CMakeLists.txt
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@@ -17,6 +17,7 @@ option(EXPOSE_EXTERNAL_RESERVE "Expose an interface to reserve memory using the
option(SNMALLOC_RUST_SUPPORT "Build static library for rust" OFF)
option(SNMALLOC_STATIC_LIBRARY "Build static libraries" ON)
option(SNMALLOC_QEMU_WORKAROUND "Disable using madvise(DONT_NEED) to zero memory on Linux" Off)
option(SNMALLOC_OPTIMISE_FOR_CURRENT_MACHINE "Compile for current machine architecture" Off)
set(CACHE_FRIENDLY_OFFSET OFF CACHE STRING "Base offset to place linked-list nodes.")
set(SNMALLOC_STATIC_LIBRARY_PREFIX "sn_" CACHE STRING "Static library function prefix")
@@ -169,12 +170,12 @@ if(NOT DEFINED SNMALLOC_ONLY_HEADER_LIBRARY)
target_link_libraries(snmalloc_lib INTERFACE "-rdynamic")
endif()
if((${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86_64") OR
(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86") OR
(${CMAKE_SYSTEM_PROCESSOR} MATCHES "arm"))
if(SNMALLOC_OPTIMISE_FOR_CURRENT_MACHINE)
check_cxx_compiler_flag(-march=native SUPPORT_MARCH_NATIVE)
if (SUPPORT_MARCH_NATIVE)
add_compile_options(-march=native)
else()
message(WARNING "Compiler does not support `-march=native` required by SNMALLOC_OPTIMISE_FOR_CURRENT_MACHINE")
endif()
endif()