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# Macros for building CUDA code.
def if_cuda(if_true, if_false = []):
"""Shorthand for select()'ing on whether we're building with CUDA.
Returns a select statement which evaluates to if_true if we're building
with CUDA enabled. Otherwise, the select statement evaluates to if_false.
"""
return select({
"@local_config_cuda//cuda:using_nvcc": if_true,
"@local_config_cuda//cuda:using_clang": if_true,
"//conditions:default": if_false
})
def cuda_default_copts():
"""Default options for all CUDA compilations."""
return if_cuda(["-x", "cuda", "-DGOOGLE_CUDA=1"] + [])
def cuda_is_configured():
"""Returns true if CUDA was enabled during the configure process."""
return True
def if_cuda_is_configured(x):
"""Tests if the CUDA was enabled during the configure process.
Unlike if_cuda(), this does not require that we are building with
--config=cuda. Used to allow non-CUDA code to depend on CUDA libraries.
"""
if cuda_is_configured():
return x
return []
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