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132 lines
4.2 KiB
132 lines
4.2 KiB
load("@rules_cc//cc:find_cc_toolchain.bzl", "find_cpp_toolchain")
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load(":cc_constants.bzl", "constants")
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# "cc_object" module copts, taken from build/soong/cc/object.go
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_CC_OBJECT_COPTS = ["-fno-addrsig"]
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# partialLd module link opts, taken from build/soong/cc/builder.go
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# https://cs.android.com/android/platform/superproject/+/master:build/soong/cc/builder.go;l=87;drc=f2be52c4dcc2e3d743318e106633e61de0ad2afd
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_CC_OBJECT_LINKOPTS = [
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"-fuse-ld=lld",
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"-nostdlib",
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"-no-pie",
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"-Wl,-r",
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]
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CcObjectInfo = provider(fields = [
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# The merged compilation outputs for this cc_object and its transitive
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# dependencies.
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"objects",
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])
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def split_srcs_hdrs(files):
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headers = []
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non_headers = []
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for f in files:
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if f.extension in constants.hdr_exts:
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headers += [f]
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else:
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non_headers += [f]
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return non_headers, headers
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def _cc_object_impl(ctx):
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cc_toolchain = find_cpp_toolchain(ctx)
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feature_configuration = cc_common.configure_features(
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ctx = ctx,
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cc_toolchain = cc_toolchain,
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requested_features = ctx.features,
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unsupported_features = ctx.disabled_features + ["linker_flags"],
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)
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compilation_contexts = []
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deps_objects = []
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for obj in ctx.attr.deps:
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compilation_contexts.append(obj[CcInfo].compilation_context)
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deps_objects.append(obj[CcObjectInfo].objects)
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product_variables = ctx.attr._android_product_variables[platform_common.TemplateVariableInfo]
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asflags = [flag.format(**product_variables.variables) for flag in ctx.attr.asflags]
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srcs, private_hdrs = split_srcs_hdrs(ctx.files.srcs)
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(compilation_context, compilation_outputs) = cc_common.compile(
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name = ctx.label.name,
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actions = ctx.actions,
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feature_configuration = feature_configuration,
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cc_toolchain = cc_toolchain,
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srcs = srcs,
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includes = ctx.attr.includes,
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public_hdrs = ctx.files.hdrs,
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private_hdrs = private_hdrs,
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user_compile_flags = ctx.attr.copts + asflags,
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compilation_contexts = compilation_contexts,
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)
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objects_to_link = cc_common.merge_compilation_outputs(compilation_outputs=deps_objects + [compilation_outputs])
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# partially link if there are multiple object files
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if len(objects_to_link.objects) + len(objects_to_link.pic_objects) > 1:
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linking_output = cc_common.link(
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name = ctx.label.name + ".o",
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actions = ctx.actions,
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feature_configuration = feature_configuration,
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cc_toolchain = cc_toolchain,
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user_link_flags = _CC_OBJECT_LINKOPTS,
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compilation_outputs = objects_to_link,
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)
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files = depset([linking_output.executable])
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else:
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files = depset(objects_to_link.objects + objects_to_link.pic_objects)
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return [
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DefaultInfo(files = files),
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CcInfo(compilation_context = compilation_context),
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CcObjectInfo(objects = objects_to_link),
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]
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_cc_object = rule(
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implementation = _cc_object_impl,
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attrs = {
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"srcs": attr.label_list(allow_files = constants.all_dot_exts),
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"hdrs": attr.label_list(allow_files = constants.hdr_dot_exts),
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"includes": attr.string_list(),
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"copts": attr.string_list(),
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"asflags": attr.string_list(),
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"deps": attr.label_list(providers=[CcInfo, CcObjectInfo]),
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"_cc_toolchain": attr.label(
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default = Label("@local_config_cc//:toolchain"),
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providers = [cc_common.CcToolchainInfo],
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),
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"_android_product_variables": attr.label(
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default = Label("//build/bazel/product_variables:android_product_variables"),
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providers = [platform_common.TemplateVariableInfo],
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),
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},
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toolchains = ["@bazel_tools//tools/cpp:toolchain_type"],
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fragments = ["cpp"],
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)
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def cc_object(
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name,
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copts = [],
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hdrs = [],
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asflags = [],
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srcs = [],
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deps = [],
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native_bridge_supported = False, # TODO: not supported yet.
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**kwargs):
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"Build macro to correspond with the cc_object Soong module."
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_cc_object(
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name = name,
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hdrs = hdrs,
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asflags = asflags,
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copts = _CC_OBJECT_COPTS + copts,
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srcs = srcs,
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deps = deps,
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**kwargs
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)
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