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Add OpenMP compile/link flags to setup.py for source builds #9456

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Add OpenMP compile/link flags to setup.py for source builds #9456

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16 changes: 16 additions & 0 deletions setup.py
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Original file line number Diff line number Diff line change
Expand Up @@ -131,6 +131,12 @@ def get_macros_and_flags():
if sysconfig.get_config_var("Py_GIL_DISABLED"):
extra_compile_args["cxx"].append("-DPy_GIL_DISABLED")

if sys.platform == "darwin":
extra_compile_args["cxx"].append("-Xpreprocessor")
extra_compile_args["cxx"].append("-fopenmp")
elif sys.platform != "win32":
extra_compile_args["cxx"].append("-fopenmp")

if DEBUG:
extra_compile_args["cxx"].append("-g")
extra_compile_args["cxx"].append("-O0")
Expand Down Expand Up @@ -182,12 +188,22 @@ def make_C_extension():
sources += mps_sources

define_macros, extra_compile_args = get_macros_and_flags()

extra_link_args = []
if sys.platform == "darwin":
# Link against libomp shipped with PyTorch for at::parallel_for support
torch_lib_dir = os.path.join(os.path.dirname(torch.__file__), "lib")
extra_link_args = [f"-L{torch_lib_dir}", "-lomp"]
elif sys.platform != "win32":
extra_link_args = ["-lgomp"]

return Extension(
name="torchvision._C",
sources=sorted(str(s) for s in sources),
include_dirs=[CSRS_DIR],
define_macros=define_macros,
extra_compile_args=extra_compile_args,
extra_link_args=extra_link_args,
)


Expand Down