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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /third_party/libwebrtc/build/rust/std/BUILD.gn
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+# Copyright 2021 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This file provides the ability for our C++ toolchain to successfully
+# link binaries containing arbitrary Rust code.
+#
+# By "arbitrary Rust code" I mean .rlib archives full of Rust code, which
+# is actually a static archive.
+#
+# Those static libraries don't link as-is into a final executable because
+# they're designed for downstream processing by further invocations of rustc
+# which link into a final binary. That final invocation of rustc knows how
+# to do two things:
+# * Find the Rust standard library.
+# * Remap some generic allocator symbols to the specific allocator symbols
+# in use.
+# This file does both those things. Any C++ target containing Rust .rlibs
+# should simply depend on :std within this file and it will be taken care of.
+# In practice, this will in future be taken care of by a standard template
+# used for each Rust source set, so that a typical user of Rust need not
+# think about it.
+#
+# This is obviously a bit fragile - rustc might do other magic in future.
+# But, linking with a final C++ toolchain is something often needed, and
+# https://github.com/rust-lang/rust/issues/64191 aims to make this
+# officially possible.
+
+import("//build/config/compiler/compiler.gni")
+import("//build/config/rust.gni")
+
+stdlib_files = [
+ "std", # List first because it makes depfiles more debuggable (see below)
+ "addr2line",
+ "adler",
+ "alloc",
+ "cfg_if",
+ "compiler_builtins",
+ "core",
+ "getopts",
+ "gimli",
+ "hashbrown",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "panic_abort",
+ "panic_unwind",
+ "proc_macro",
+ "rustc_demangle",
+ "std_detect",
+ "term",
+ "test",
+ "unicode_width",
+ "unwind",
+]
+
+if (!use_unverified_rust_toolchain) {
+ # rlib files which are distributed alongside Rust's prebuilt stdlib, but we
+ # don't need to pass to the C++ linker because they're used for specialized
+ # purposes.
+ skip_stdlib_files = [
+ "profiler_builtins",
+ "rustc_std_workspace_alloc",
+ "rustc_std_workspace_core",
+ "rustc_std_workspace_std",
+ ]
+}
+
+if (toolchain_has_rust) {
+ action("find_stdlib") {
+ # Specifics of what we're doing here.
+ #
+ # We are using prebuilt Rust rlibs supplied along with the toolchain.
+ # The Rust standard library consists of rlibs with roughly all the names
+ # above.
+ #
+ # However, their filenames are not predictable, and therefore we can't
+ # have ninja rules which depend upon them. (gn offers a facility to
+ # build rules dynamically, but it's frowned upon because a script needs
+ # to run each time).
+ #
+ # Instead therefore we copy these unpredictable .rlib paths to apredictable
+ # location. That's what this script does. Furthermore, it generates a
+ # .d file in order to teach Ninja that it only needs to do this copying
+ # once, unless the source .rlibs change.
+ #
+ # The script accepts the list of known libraries and will raise an
+ # exception if the list on disk differs. (Either 'Found stdlib rlib
+ # that wasn't expected' or 'We failed to find all expected stdlib
+ # rlibs').
+ script = "find_std_rlibs.py"
+ depfile = "$target_out_dir/stdlib.d"
+ out_libdir = rebase_path(target_out_dir, root_build_dir)
+ out_depfile = rebase_path(depfile, root_build_dir)
+ args = [
+ "--rust-bin-dir",
+ rust_prefix,
+ "--output",
+ out_libdir,
+ "--depfile",
+ out_depfile,
+
+ # Due to limitations in Ninja's handling of .d files, we have to pick
+ # *the first* of our outputs. To make diagnostics more obviously
+ # related to the Rust standard library, we ensure libstd.rlib is first.
+ "--depfile-target",
+ stdlib_files[0],
+ ]
+ if (!use_unverified_rust_toolchain) {
+ args += [
+ "--stdlibs",
+ string_join(",", stdlib_files),
+ "--skip",
+ string_join(",", skip_stdlib_files),
+ ]
+ }
+ if (rust_abi_target != "") {
+ args += [
+ "--target",
+ rust_abi_target,
+ ]
+ }
+
+ outputs = []
+ foreach(lib, stdlib_files) {
+ outputs += [ "$target_out_dir/lib$lib.rlib" ]
+ }
+ }
+
+ config("rust_stdlib_config") {
+ ldflags = []
+ out_libdir = rebase_path(target_out_dir, root_build_dir)
+ foreach(lib, stdlib_files) {
+ this_file = "$out_libdir/lib$lib.rlib"
+ ldflags += [ this_file ]
+ }
+ }
+
+ source_set("remap_alloc") {
+ sources = [
+ "immediate_crash.h",
+ "remap_alloc.c",
+ ]
+ }
+
+ group("std") {
+ all_dependent_configs = [ ":rust_stdlib_config" ]
+ deps = [
+ ":find_stdlib",
+ ":remap_alloc",
+ ]
+ }
+}