examples/rust_example/build/BUILD.gn

toolchain("rust") {
  tool("rust_bin") {
    depfile = "{{target_out_dir}}/{{crate_name}}.d"
    outfile = "{{target_out_dir}}/{{crate_name}}"
    command = "rustc --crate-name {{crate_name}} {{source}} --crate-type {{crate_type}} --emit=dep-info=$depfile,link {{rustflags}} -o $outfile {{rustdeps}} {{externs}}"
    description = "RUST $outfile"
    outputs = [ outfile ]
  }

  tool("rust_staticlib") {
    depfile = "{{target_out_dir}}/{{crate_name}}.d"
    outfile = "{{target_out_dir}}/{{crate_name}}.a"
    command = "rustc --crate-name {{crate_name}} {{source}} --crate-type {{crate_type}} --emit=dep-info=$depfile,link {{rustflags}} -o $outfile {{rustdeps}} {{externs}}"
    description = "RUST $outfile"
    outputs = [ outfile ]
  }

  tool("rust_rlib") {
    depfile = "{{target_out_dir}}/{{crate_name}}.d"
    outfile = "{{target_out_dir}}/lib{{crate_name}}.rlib"
    command = "rustc --crate-name {{crate_name}} {{source}} --crate-type {{crate_type}} --emit=dep-info=$depfile,link {{rustflags}} -o $outfile {{rustdeps}} {{externs}}"
    description = "RUST $outfile"
    outputs = [ outfile ]
  }

  tool("rust_cdylib") {
    depfile = "{{target_out_dir}}/{{crate_name}}.d"
    outfile = "{{target_out_dir}}/lib{{crate_name}}.so"
    command = "rustc --crate-name {{crate_name}} {{source}} --crate-type {{crate_type}} --emit=dep-info=$depfile,link {{rustflags}} -o $outfile {{rustdeps}} {{externs}}"
    description = "RUST $outfile"
    outputs = [ outfile ]
  }

  tool("stamp") {
    command = "touch {{output}}"
    description = "STAMP {{output}}"
  }

  tool("copy") {
    command = "cp -af {{source}} {{output}}"
    description = "COPY {{source}} {{output}}"
  }

  tool("cxx") {
    depfile = "{{output}}.d"
    command = "clang++ -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} -c {{source}} -o {{output}}"
    depsformat = "gcc"
    description = "CXX {{output}}"
    outputs = [ "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o" ]
  }

  tool("alink") {
    command = "llvm-ar rcs {{output}} {{inputs}}"
    description = "AR {{target_output_name}}{{output_extension}}"
    outputs = [ "{{target_out_dir}}/{{target_output_name}}{{output_extension}}" ]
    default_output_extension = ".a"
    output_prefix = "lib"
  }

  tool("link") {
    outfile = "{{target_output_name}}{{output_extension}}"
    rspfile = "$outfile.rsp"
    command = "clang++ {{ldflags}} -o $outfile -Wl,--start-group @$rspfile {{solibs}} {{libs}} {{rlibs}} -Wl,--end-group"
    description = "LINK $outfile"
    default_output_dir = "{{root_out_dir}}"
    rspfile_content = "{{inputs}}"
    outputs = [ outfile ]
  }
}

config("rust_defaults") {
  rustflags = [ "-Cdebuginfo=2" ]
}