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| 1 | +# Copyright 2019 the V8 project authors. All rights reserved. |
| 2 | +# Copyright 2016 The Chromium Authors. All rights reserved. |
| 3 | +# Use of this source code is governed by a BSD-style license that can be |
| 4 | +# found in the LICENSE file. |
| 5 | + |
| 6 | +import("//build/config/compiler/compiler.gni") |
| 7 | + |
| 8 | +template("split_static_library") { |
| 9 | + assert(defined(invoker.split_count), |
| 10 | + "Must define split_count for split_static_library") |
| 11 | + |
| 12 | + # In many conditions the number of inputs will be 1 (because the |
| 13 | + # count will be conditional on platform or configuration) and for |
| 14 | + # some build configurations it's unnecessary to split libraries |
| 15 | + # since the tooling will never create files of a problematic size. |
| 16 | + if (invoker.split_count == 1 || use_lld) { |
| 17 | + static_library(target_name) { |
| 18 | + forward_variables_from(invoker, "*") |
| 19 | + } |
| 20 | + } else { |
| 21 | + group_name = target_name |
| 22 | + |
| 23 | + generated_static_libraries = [] |
| 24 | + current_library_index = 0 |
| 25 | + foreach(current_sources, split_list(invoker.sources, invoker.split_count)) { |
| 26 | + current_name = "${target_name}_$current_library_index" |
| 27 | + assert( |
| 28 | + current_sources != [], |
| 29 | + "Your values for splitting a static library generate one that has no sources.") |
| 30 | + generated_static_libraries += [ ":$current_name" ] |
| 31 | + |
| 32 | + static_library(current_name) { |
| 33 | + # Generated static library shard gets everything but sources (which |
| 34 | + # we're redefining) and visibility (which is set to be the group |
| 35 | + # below). |
| 36 | + forward_variables_from(invoker, |
| 37 | + "*", |
| 38 | + [ |
| 39 | + "check_includes", |
| 40 | + "sources", |
| 41 | + "visibility", |
| 42 | + ]) |
| 43 | + sources = current_sources |
| 44 | + visibility = [ ":$group_name" ] |
| 45 | + |
| 46 | + # When splitting a target's sources up into a series of static |
| 47 | + # libraries, those targets will naturally include headers from each |
| 48 | + # other arbitrarily. We could theoretically generate a web of |
| 49 | + # dependencies and allow_circular_includes_from between all pairs of |
| 50 | + # targets, but that's very cumbersome. Typical usage in Chrome is that |
| 51 | + # only official Windows builds use split static libraries due to the |
| 52 | + # Visual Studio size limits, and this means we'll still get header |
| 53 | + # checking coverage for the other configurations. |
| 54 | + check_includes = false |
| 55 | + |
| 56 | + # Uniquify the output name if one is specified. |
| 57 | + if (defined(invoker.output_name)) { |
| 58 | + output_name = "${invoker.output_name}_$current_library_index" |
| 59 | + } |
| 60 | + } |
| 61 | + |
| 62 | + current_library_index = current_library_index + 1 |
| 63 | + } |
| 64 | + |
| 65 | + group(group_name) { |
| 66 | + public_deps = generated_static_libraries |
| 67 | + forward_variables_from(invoker, |
| 68 | + [ |
| 69 | + "testonly", |
| 70 | + "visibility", |
| 71 | + ]) |
| 72 | + } |
| 73 | + } |
| 74 | +} |
| 75 | + |
| 76 | +set_defaults("split_static_library") { |
| 77 | + configs = default_compiler_configs |
| 78 | +} |
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