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// Copyright 2019 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package main
import (
"strconv"
)
type config struct {
// TODO: Refactor this flag into more generic configuration properties.
isHostWrapper bool
// Whether to use ccache.
useCCache bool
// Flags to add to gcc and clang.
commonFlags []string
// Flags to add to gcc only.
gccFlags []string
// Flags to add to clang only.
clangFlags []string
// Toolchain root path relative to the wrapper binary.
rootRelPath string
// Path of the old wrapper using the toolchain root.
oldWrapperPath string
// Whether to mock out the calls that the old wrapper does.
mockOldWrapperCmds bool
// Directory to store errors that were prevented with -Wno-error.
newWarningsDir string
// Version. Only used for printing via -print-cmd.
version string
}
// Version can be set via a linker flag.
// Values fills config.version.
var Version = ""
// OldWrapperPath can be set via a linker flag.
// Value fills config.oldWrapperPath.
var OldWrapperPath = ""
// UseCCache can be set via a linker flag.
// Value will be passed to strconv.ParseBool.
// E.g. go build -ldflags '-X config.UseCCache=true'.
var UseCCache = "unknown"
// ConfigName can be set via a linker flag.
// Value has to be one of:
// - "cros.hardened"
// - "cros.nonhardened"
var ConfigName = "unknown"
// Returns the configuration matching the UseCCache and ConfigName.
func getRealConfig() (*config, error) {
useCCache, err := strconv.ParseBool(UseCCache)
if err != nil {
return nil, wrapErrorwithSourceLocf(err, "invalid format for UseCCache")
}
config, err := getConfig(ConfigName, useCCache, OldWrapperPath, Version)
if err != nil {
return nil, err
}
return config, nil
}
func getConfig(configName string, useCCache bool, oldWrapperPath string, version string) (*config, error) {
var cfg *config
switch configName {
case "cros.hardened":
cfg = crosHardenedConfig
case "cros.nonhardened":
cfg = crosNonHardenedConfig
case "cros.host":
cfg = crosHostConfig
default:
return nil, newErrorwithSourceLocf("unknown config name: %s", configName)
}
cfg.useCCache = useCCache
cfg.oldWrapperPath = oldWrapperPath
cfg.version = version
return cfg, nil
}
// Full hardening.
// Temporarily disable function splitting because of chromium:434751.
var crosHardenedConfig = &config{
rootRelPath: "../../../../..",
commonFlags: []string{
"-fstack-protector-strong",
"-fPIE",
"-pie",
"-D_FORTIFY_SOURCE=2",
"-fno-omit-frame-pointer",
},
gccFlags: []string{
"-fno-reorder-blocks-and-partition",
"-Wno-unused-local-typedefs",
"-Wno-maybe-uninitialized",
},
// Temporarily disable tautological-*-compare chromium:778316.
// Temporarily add no-unknown-warning-option to deal with old clang versions.
// Temporarily disable Wsection since kernel gets a bunch of these. chromium:778867
// Disable "-faddrsig" since it produces object files that strip doesn't understand, chromium:915742.
clangFlags: []string{
"-Qunused-arguments",
"-grecord-gcc-switches",
"-fno-addrsig",
"-Wno-tautological-constant-compare",
"-Wno-tautological-unsigned-enum-zero-compare",
"-Wno-unknown-warning-option",
"-Wno-section",
"-static-libgcc",
},
newWarningsDir: "/tmp/fatal_clang_warnings",
}
// Flags to be added to non-hardened toolchain.
var crosNonHardenedConfig = &config{
rootRelPath: "../../../../..",
commonFlags: []string{},
gccFlags: []string{
"-Wno-maybe-uninitialized",
"-Wno-unused-local-typedefs",
"-Wno-deprecated-declarations",
"-Wtrampolines",
},
// Temporarily disable tautological-*-compare chromium:778316.
// Temporarily add no-unknown-warning-option to deal with old clang versions.
// Temporarily disable Wsection since kernel gets a bunch of these. chromium:778867
clangFlags: []string{
"-Qunused-arguments",
"-Wno-tautological-constant-compare",
"-Wno-tautological-unsigned-enum-zero-compare",
"-Wno-unknown-warning-option",
"-Wno-section",
"-static-libgcc",
},
newWarningsDir: "/tmp/fatal_clang_warnings",
}
// Flags to be added to host toolchain.
var crosHostConfig = &config{
isHostWrapper: true,
rootRelPath: "../..",
commonFlags: []string{},
gccFlags: []string{
"-Wno-maybe-uninitialized",
"-Wno-unused-local-typedefs",
"-Wno-deprecated-declarations",
},
// Temporarily disable tautological-*-compare chromium:778316.
// Temporarily add no-unknown-warning-option to deal with old clang versions.
clangFlags: []string{
"-Qunused-arguments",
"-grecord-gcc-switches",
"-fno-addrsig",
"-Wno-unused-local-typedefs",
"-Wno-deprecated-declarations",
"-Wno-tautological-constant-compare",
"-Wno-tautological-unsigned-enum-zero-compare",
"-Wno-unknown-warning-option",
},
newWarningsDir: "/tmp/fatal_clang_warnings",
}
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