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74 lines
2.7 KiB
Plaintext
74 lines
2.7 KiB
Plaintext
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# Copyright 2016 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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template("split_static_library") {
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assert(defined(invoker.split_count),
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"Must define split_count for split_static_library")
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# In many conditions the number of inputs will be 1 (because the count will
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# be conditional on platform or configuration) so optimize that.
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if (invoker.split_count == 1) {
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static_library(target_name) {
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forward_variables_from(invoker, "*")
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}
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} else {
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group_name = target_name
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generated_static_libraries = []
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current_library_index = 0
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foreach(current_sources, split_list(invoker.sources, invoker.split_count)) {
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current_name = "${target_name}_$current_library_index"
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assert(
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current_sources != [],
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"Your values for splitting a static library generate one that has no sources.")
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generated_static_libraries += [ ":$current_name" ]
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static_library(current_name) {
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# Generated static library shard gets everything but sources (which
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# we're redefining) and visibility (which is set to be the group
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# below).
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forward_variables_from(invoker,
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"*",
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[
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"check_includes",
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"sources",
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"visibility",
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])
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sources = current_sources
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visibility = [ ":$group_name" ]
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# When splitting a target's sources up into a series of static
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# libraries, those targets will naturally include headers from each
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# other arbitrarily. We could theoretically generate a web of
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# dependencies and allow_circular_includes_from between all pairs of
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# targets, but that's very cumbersome. Typical usage in Chrome is that
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# only official Windows builds use split static libraries due to the
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# Visual Studio size limits, and this means we'll still get header
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# checking coverage for the other configurations.
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check_includes = false
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# Uniquify the output name if one is specified.
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if (defined(invoker.output_name)) {
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output_name = "${invoker.output_name}_$current_library_index"
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}
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}
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current_library_index = current_library_index + 1
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}
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group(group_name) {
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public_deps = generated_static_libraries
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forward_variables_from(invoker,
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[
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"testonly",
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"visibility",
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])
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}
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}
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}
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set_defaults("split_static_library") {
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configs = default_compiler_configs
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}
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