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# Copyright (C) 2021 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
load("//build/bazel/rules/cc:cc_constants.bzl", "constants")
def extension(f):
return f.split(".")[-1]
def group_files_by_ext(files):
cpp = []
c = []
asm = []
# This for-loop iterator works because filegroups in Android don't use
# configurable selects.
for f in files:
if extension(f) in constants.c_src_exts:
c.append(f)
elif extension(f) in constants.cpp_src_exts:
cpp.append(f)
elif extension(f) in constants.as_src_exts:
asm.append(f)
else:
# not C based
continue
return cpp, c, asm
# Filegroup is a macro because it needs to expand to language specific source
# files for cc_library's srcs_as, srcs_c and srcs attributes.
def filegroup(name, srcs = [], **kwargs):
native.filegroup(
name = name,
srcs = srcs,
**kwargs
)
# These genrule prevent empty filegroups being used as deps to cc libraries,
# avoiding the error:
#
# in srcs attribute of cc_library rule //foo/bar:baz:
# '//foo/bar/some_other:baz2' does not produce any cc_library srcs files.
native.genrule(
name = name + "_null_cc",
outs = [name + "_null.cc"],
tags = ["manual"],
cmd = "touch $@",
)
native.genrule(
name = name + "_null_c",
outs = [name + "_null.c"],
tags = ["manual"],
cmd = "touch $@",
)
native.genrule(
name = name + "_null_s",
outs = [name + "_null.S"],
tags = ["manual"],
cmd = "touch $@",
)
cpp_srcs, c_srcs, as_srcs = group_files_by_ext(srcs)
native.filegroup(
name = name + "_cpp_srcs",
srcs = [name + "_null.cc"] + cpp_srcs,
tags = ["manual"],
)
native.filegroup(
name = name + "_c_srcs",
srcs = [name + "_null.c"] + c_srcs,
tags = ["manual"],
)
native.filegroup(
name = name + "_as_srcs",
srcs = [name + "_null.S"] + as_srcs,
tags = ["manual"],
)
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