Files
build_soong/cc/bp2build.go
Chris Parsons af24cdd99f Split asm and c flags and srcs in bp2build output
This allows removal of almost all current items from the mixed build
denylist, which were previously broken due to being unable to separately
control flags for compilations of different languages within the same
target.

Note that this does not appropriately implement asm/c srcs and flags for
either the shared variant or the static variant. This will require a
followup.

Test: bp2build.sh and mixed_libc.sh CI scripts
Test: Updated b2build tests

Change-Id: I28cf7437ee96cdf2fdbcb1eda2303691cff08ba4
2021-05-24 21:49:14 -04:00

556 lines
22 KiB
Go

// Copyright 2021 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cc
import (
"path/filepath"
"strings"
"android/soong/android"
"android/soong/bazel"
)
// bp2build functions and helpers for converting cc_* modules to Bazel.
func init() {
android.DepsBp2BuildMutators(RegisterDepsBp2Build)
}
func RegisterDepsBp2Build(ctx android.RegisterMutatorsContext) {
ctx.BottomUp("cc_bp2build_deps", depsBp2BuildMutator)
}
// A naive deps mutator to add deps on all modules across all combinations of
// target props for cc modules. This is needed to make module -> bazel label
// resolution work in the bp2build mutator later. This is probably
// the wrong way to do it, but it works.
//
// TODO(jingwen): can we create a custom os mutator in depsBp2BuildMutator to do this?
func depsBp2BuildMutator(ctx android.BottomUpMutatorContext) {
module, ok := ctx.Module().(*Module)
if !ok {
// Not a cc module
return
}
if !module.ConvertWithBp2build(ctx) {
return
}
var allDeps []string
for _, p := range module.GetTargetProperties(ctx, &BaseCompilerProperties{}) {
// base compiler props
if baseCompilerProps, ok := p.(*BaseCompilerProperties); ok {
allDeps = append(allDeps, baseCompilerProps.Generated_headers...)
allDeps = append(allDeps, baseCompilerProps.Generated_sources...)
}
}
for _, p := range module.GetArchProperties(ctx, &BaseCompilerProperties{}) {
// arch specific compiler props
if baseCompilerProps, ok := p.(*BaseCompilerProperties); ok {
allDeps = append(allDeps, baseCompilerProps.Generated_headers...)
allDeps = append(allDeps, baseCompilerProps.Generated_sources...)
}
}
for _, p := range module.GetTargetProperties(ctx, &BaseLinkerProperties{}) {
// arch specific linker props
if baseLinkerProps, ok := p.(*BaseLinkerProperties); ok {
allDeps = append(allDeps, baseLinkerProps.Header_libs...)
allDeps = append(allDeps, baseLinkerProps.Export_header_lib_headers...)
allDeps = append(allDeps, baseLinkerProps.Static_libs...)
allDeps = append(allDeps, baseLinkerProps.Whole_static_libs...)
}
}
for _, p := range module.GetArchProperties(ctx, &BaseLinkerProperties{}) {
// arch specific linker props
if baseLinkerProps, ok := p.(*BaseLinkerProperties); ok {
allDeps = append(allDeps, baseLinkerProps.Header_libs...)
allDeps = append(allDeps, baseLinkerProps.Export_header_lib_headers...)
allDeps = append(allDeps, baseLinkerProps.Static_libs...)
allDeps = append(allDeps, baseLinkerProps.Whole_static_libs...)
}
}
// Deps in the static: { .. } and shared: { .. } props of a cc_library.
if lib, ok := module.compiler.(*libraryDecorator); ok {
allDeps = append(allDeps, lib.SharedProperties.Shared.Static_libs...)
allDeps = append(allDeps, lib.SharedProperties.Shared.Whole_static_libs...)
allDeps = append(allDeps, lib.SharedProperties.Shared.Shared_libs...)
allDeps = append(allDeps, lib.StaticProperties.Static.Static_libs...)
allDeps = append(allDeps, lib.StaticProperties.Static.Whole_static_libs...)
allDeps = append(allDeps, lib.StaticProperties.Static.Shared_libs...)
// TODO(b/186024507, b/186489250): Temporarily exclude adding
// system_shared_libs deps until libc and libm builds.
// allDeps = append(allDeps, lib.SharedProperties.Shared.System_shared_libs...)
// allDeps = append(allDeps, lib.StaticProperties.Static.System_shared_libs...)
}
ctx.AddDependency(module, nil, android.SortedUniqueStrings(allDeps)...)
}
type sharedAttributes struct {
copts bazel.StringListAttribute
srcs bazel.LabelListAttribute
staticDeps bazel.LabelListAttribute
dynamicDeps bazel.LabelListAttribute
wholeArchiveDeps bazel.LabelListAttribute
}
// bp2buildParseSharedProps returns the attributes for the shared variant of a cc_library.
func bp2BuildParseSharedProps(ctx android.TopDownMutatorContext, module *Module) sharedAttributes {
lib, ok := module.compiler.(*libraryDecorator)
if !ok {
return sharedAttributes{}
}
copts := bazel.StringListAttribute{Value: lib.SharedProperties.Shared.Cflags}
srcs := bazel.LabelListAttribute{
Value: android.BazelLabelForModuleSrc(ctx, lib.SharedProperties.Shared.Srcs)}
staticDeps := bazel.LabelListAttribute{
Value: android.BazelLabelForModuleDeps(ctx, lib.SharedProperties.Shared.Static_libs)}
dynamicDeps := bazel.LabelListAttribute{
Value: android.BazelLabelForModuleDeps(ctx, lib.SharedProperties.Shared.Shared_libs)}
wholeArchiveDeps := bazel.LabelListAttribute{
Value: android.BazelLabelForModuleDeps(ctx, lib.SharedProperties.Shared.Whole_static_libs)}
return sharedAttributes{
copts: copts,
srcs: srcs,
staticDeps: staticDeps,
dynamicDeps: dynamicDeps,
wholeArchiveDeps: wholeArchiveDeps,
}
}
type staticAttributes struct {
copts bazel.StringListAttribute
srcs bazel.LabelListAttribute
staticDeps bazel.LabelListAttribute
dynamicDeps bazel.LabelListAttribute
wholeArchiveDeps bazel.LabelListAttribute
}
// bp2buildParseStaticProps returns the attributes for the static variant of a cc_library.
func bp2BuildParseStaticProps(ctx android.TopDownMutatorContext, module *Module) staticAttributes {
lib, ok := module.compiler.(*libraryDecorator)
if !ok {
return staticAttributes{}
}
copts := bazel.StringListAttribute{Value: lib.StaticProperties.Static.Cflags}
srcs := bazel.LabelListAttribute{
Value: android.BazelLabelForModuleSrc(ctx, lib.StaticProperties.Static.Srcs)}
staticDeps := bazel.LabelListAttribute{
Value: android.BazelLabelForModuleDeps(ctx, lib.StaticProperties.Static.Static_libs)}
dynamicDeps := bazel.LabelListAttribute{
Value: android.BazelLabelForModuleDeps(ctx, lib.StaticProperties.Static.Shared_libs)}
wholeArchiveDeps := bazel.LabelListAttribute{
Value: android.BazelLabelForModuleDeps(ctx, lib.StaticProperties.Static.Whole_static_libs)}
return staticAttributes{
copts: copts,
srcs: srcs,
staticDeps: staticDeps,
dynamicDeps: dynamicDeps,
wholeArchiveDeps: wholeArchiveDeps,
}
}
// Convenience struct to hold all attributes parsed from compiler properties.
type compilerAttributes struct {
// Options for all languages
copts bazel.StringListAttribute
// Assembly options and sources
asFlags bazel.StringListAttribute
asSrcs bazel.LabelListAttribute
// C options and sources
conlyFlags bazel.StringListAttribute
cSrcs bazel.LabelListAttribute
// C++ options and sources
cppFlags bazel.StringListAttribute
srcs bazel.LabelListAttribute
}
// bp2BuildParseCompilerProps returns copts, srcs and hdrs and other attributes.
func bp2BuildParseCompilerProps(ctx android.TopDownMutatorContext, module *Module) compilerAttributes {
var srcs bazel.LabelListAttribute
var copts bazel.StringListAttribute
var asFlags bazel.StringListAttribute
var conlyFlags bazel.StringListAttribute
var cppFlags bazel.StringListAttribute
// Creates the -I flags for a directory, while making the directory relative
// to the exec root for Bazel to work.
includeFlags := func(dir string) []string {
// filepath.Join canonicalizes the path, i.e. it takes care of . or .. elements.
moduleDirRootedPath := filepath.Join(ctx.ModuleDir(), dir)
return []string{
"-I" + moduleDirRootedPath,
// Include the bindir-rooted path (using make variable substitution). This most
// closely matches Bazel's native include path handling, which allows for dependency
// on generated headers in these directories.
// TODO(b/188084383): Handle local include directories in Bazel.
"-I$(BINDIR)/" + moduleDirRootedPath,
}
}
// Parse the list of module-relative include directories (-I).
parseLocalIncludeDirs := func(baseCompilerProps *BaseCompilerProperties) []string {
// include_dirs are root-relative, not module-relative.
includeDirs := bp2BuildMakePathsRelativeToModule(ctx, baseCompilerProps.Include_dirs)
return append(includeDirs, baseCompilerProps.Local_include_dirs...)
}
parseCommandLineFlags := func(soongFlags []string) []string {
var result []string
for _, flag := range soongFlags {
// Soong's cflags can contain spaces, like `-include header.h`. For
// Bazel's copts, split them up to be compatible with the
// no_copts_tokenization feature.
result = append(result, strings.Split(flag, " ")...)
}
return result
}
// Parse the list of copts.
parseCopts := func(baseCompilerProps *BaseCompilerProperties) []string {
var copts []string
copts = append(copts, parseCommandLineFlags(baseCompilerProps.Cflags)...)
for _, dir := range parseLocalIncludeDirs(baseCompilerProps) {
copts = append(copts, includeFlags(dir)...)
}
return copts
}
// baseSrcs contain the list of src files that are used for every configuration.
var baseSrcs []string
// baseExcludeSrcs contain the list of src files that are excluded for every configuration.
var baseExcludeSrcs []string
// baseSrcsLabelList is a clone of the base srcs LabelList, used for computing the
// arch or os specific srcs later.
var baseSrcsLabelList bazel.LabelList
// Parse srcs from an arch or OS's props value, taking the base srcs and
// exclude srcs into account.
parseSrcs := func(baseCompilerProps *BaseCompilerProperties) bazel.LabelList {
// Combine the base srcs and arch-specific srcs
allSrcs := append(baseSrcs, baseCompilerProps.Srcs...)
// Add srcs-like dependencies such as generated files.
// First create a LabelList containing these dependencies, then merge the values with srcs.
generatedHdrsAndSrcs := baseCompilerProps.Generated_headers
generatedHdrsAndSrcs = append(generatedHdrsAndSrcs, baseCompilerProps.Generated_sources...)
generatedHdrsAndSrcsLabelList := android.BazelLabelForModuleDeps(ctx, generatedHdrsAndSrcs)
// Combine the base exclude_srcs and configuration-specific exclude_srcs
allExcludeSrcs := append(baseExcludeSrcs, baseCompilerProps.Exclude_srcs...)
allSrcsLabelList := android.BazelLabelForModuleSrcExcludes(ctx, allSrcs, allExcludeSrcs)
return bazel.AppendBazelLabelLists(allSrcsLabelList, generatedHdrsAndSrcsLabelList)
}
for _, props := range module.compiler.compilerProps() {
if baseCompilerProps, ok := props.(*BaseCompilerProperties); ok {
srcs.Value = parseSrcs(baseCompilerProps)
copts.Value = parseCopts(baseCompilerProps)
asFlags.Value = parseCommandLineFlags(baseCompilerProps.Asflags)
conlyFlags.Value = parseCommandLineFlags(baseCompilerProps.Conlyflags)
cppFlags.Value = parseCommandLineFlags(baseCompilerProps.Cppflags)
// Used for arch-specific srcs later.
baseSrcs = baseCompilerProps.Srcs
baseSrcsLabelList = parseSrcs(baseCompilerProps)
baseExcludeSrcs = baseCompilerProps.Exclude_srcs
break
}
}
// Handle include_build_directory prop. If the property is true, then the
// target has access to all headers recursively in the package, and has
// "-I<module-dir>" in its copts.
if c, ok := module.compiler.(*baseCompiler); ok && c.includeBuildDirectory() {
copts.Value = append(copts.Value, includeFlags(".")...)
} else if c, ok := module.compiler.(*libraryDecorator); ok && c.includeBuildDirectory() {
copts.Value = append(copts.Value, includeFlags(".")...)
}
for arch, props := range module.GetArchProperties(ctx, &BaseCompilerProperties{}) {
if baseCompilerProps, ok := props.(*BaseCompilerProperties); ok {
// If there's arch specific srcs or exclude_srcs, generate a select entry for it.
// TODO(b/186153868): do this for OS specific srcs and exclude_srcs too.
if len(baseCompilerProps.Srcs) > 0 || len(baseCompilerProps.Exclude_srcs) > 0 {
srcsList := parseSrcs(baseCompilerProps)
srcs.SetValueForArch(arch.Name, srcsList)
// The base srcs value should not contain any arch-specific excludes.
srcs.Value = bazel.SubtractBazelLabelList(srcs.Value, bazel.LabelList{Includes: srcsList.Excludes})
}
copts.SetValueForArch(arch.Name, parseCopts(baseCompilerProps))
asFlags.SetValueForArch(arch.Name, parseCommandLineFlags(baseCompilerProps.Asflags))
conlyFlags.SetValueForArch(arch.Name, parseCommandLineFlags(baseCompilerProps.Conlyflags))
cppFlags.SetValueForArch(arch.Name, parseCommandLineFlags(baseCompilerProps.Cppflags))
}
}
// After going through all archs, delete the duplicate files in the arch
// values that are already in the base srcs.Value.
for arch, props := range module.GetArchProperties(ctx, &BaseCompilerProperties{}) {
if _, ok := props.(*BaseCompilerProperties); ok {
srcs.SetValueForArch(arch.Name, bazel.SubtractBazelLabelList(srcs.GetValueForArch(arch.Name), srcs.Value))
}
}
// Now that the srcs.Value list is finalized, compare it with the original
// list, and put the difference into the default condition for the arch
// select.
defaultsSrcs := bazel.SubtractBazelLabelList(baseSrcsLabelList, srcs.Value)
// TODO(b/186153868): handle the case with multiple variant types, e.g. when arch and os are both used.
srcs.SetValueForArch(bazel.CONDITIONS_DEFAULT, defaultsSrcs)
// Handle OS specific props.
for os, props := range module.GetTargetProperties(ctx, &BaseCompilerProperties{}) {
if baseCompilerProps, ok := props.(*BaseCompilerProperties); ok {
srcsList := parseSrcs(baseCompilerProps)
// TODO(b/186153868): add support for os-specific srcs and exclude_srcs
srcs.SetValueForOS(os.Name, bazel.SubtractBazelLabelList(srcsList, baseSrcsLabelList))
copts.SetValueForOS(os.Name, parseCopts(baseCompilerProps))
asFlags.SetValueForOS(os.Name, parseCommandLineFlags(baseCompilerProps.Asflags))
conlyFlags.SetValueForOS(os.Name, parseCommandLineFlags(baseCompilerProps.Conlyflags))
cppFlags.SetValueForOS(os.Name, parseCommandLineFlags(baseCompilerProps.Cppflags))
}
}
productVariableProps := android.ProductVariableProperties(ctx)
if props, exists := productVariableProps["Cflags"]; exists {
for _, prop := range props {
flags, ok := prop.Property.([]string)
if !ok {
ctx.ModuleErrorf("Could not convert product variable cflag property")
}
newFlags, _ := bazel.TryVariableSubstitutions(flags, prop.ProductConfigVariable)
copts.ProductValues = append(copts.ProductValues, bazel.ProductVariableValues{
ProductVariable: prop.ProductConfigVariable,
Values: newFlags,
})
}
}
// Branch srcs into three language-specific groups.
// C++ is the "catch-all" group, and comprises generated sources because we don't
// know the language of these sources until the genrule is executed.
// TODO(b/): Handle language detection of sources in a Bazel rule.
isCSrc := func(s string) bool {
return strings.HasSuffix(s, ".c")
}
isAsmSrc := func(s string) bool {
return strings.HasSuffix(s, ".S") || strings.HasSuffix(s, ".s")
}
cSrcs := bazel.FilterLabelListAttribute(srcs, isCSrc)
asSrcs := bazel.FilterLabelListAttribute(srcs, isAsmSrc)
srcs = bazel.SubtractBazelLabelListAttribute(srcs, cSrcs)
srcs = bazel.SubtractBazelLabelListAttribute(srcs, asSrcs)
return compilerAttributes{
copts: copts,
srcs: srcs,
asFlags: asFlags,
asSrcs: asSrcs,
cSrcs: cSrcs,
conlyFlags: conlyFlags,
cppFlags: cppFlags,
}
}
// Convenience struct to hold all attributes parsed from linker properties.
type linkerAttributes struct {
deps bazel.LabelListAttribute
dynamicDeps bazel.LabelListAttribute
wholeArchiveDeps bazel.LabelListAttribute
exportedDeps bazel.LabelListAttribute
linkopts bazel.StringListAttribute
versionScript bazel.LabelAttribute
}
// FIXME(b/187655838): Use the existing linkerFlags() function instead of duplicating logic here
func getBp2BuildLinkerFlags(linkerProperties *BaseLinkerProperties) []string {
flags := linkerProperties.Ldflags
if !BoolDefault(linkerProperties.Pack_relocations, true) {
flags = append(flags, "-Wl,--pack-dyn-relocs=none")
}
return flags
}
// bp2BuildParseLinkerProps parses the linker properties of a module, including
// configurable attribute values.
func bp2BuildParseLinkerProps(ctx android.TopDownMutatorContext, module *Module) linkerAttributes {
var deps bazel.LabelListAttribute
var exportedDeps bazel.LabelListAttribute
var dynamicDeps bazel.LabelListAttribute
var wholeArchiveDeps bazel.LabelListAttribute
var linkopts bazel.StringListAttribute
var versionScript bazel.LabelAttribute
for _, linkerProps := range module.linker.linkerProps() {
if baseLinkerProps, ok := linkerProps.(*BaseLinkerProperties); ok {
libs := baseLinkerProps.Header_libs
libs = append(libs, baseLinkerProps.Static_libs...)
exportedLibs := baseLinkerProps.Export_header_lib_headers
wholeArchiveLibs := baseLinkerProps.Whole_static_libs
libs = android.SortedUniqueStrings(libs)
deps = bazel.MakeLabelListAttribute(android.BazelLabelForModuleDeps(ctx, libs))
exportedDeps = bazel.MakeLabelListAttribute(android.BazelLabelForModuleDeps(ctx, exportedLibs))
linkopts.Value = getBp2BuildLinkerFlags(baseLinkerProps)
wholeArchiveDeps = bazel.MakeLabelListAttribute(android.BazelLabelForModuleDeps(ctx, wholeArchiveLibs))
if baseLinkerProps.Version_script != nil {
versionScript.Value = android.BazelLabelForModuleSrcSingle(ctx, *baseLinkerProps.Version_script)
}
sharedLibs := baseLinkerProps.Shared_libs
dynamicDeps = bazel.MakeLabelListAttribute(android.BazelLabelForModuleDeps(ctx, sharedLibs))
break
}
}
for arch, p := range module.GetArchProperties(ctx, &BaseLinkerProperties{}) {
if baseLinkerProps, ok := p.(*BaseLinkerProperties); ok {
libs := baseLinkerProps.Header_libs
libs = append(libs, baseLinkerProps.Static_libs...)
exportedLibs := baseLinkerProps.Export_header_lib_headers
wholeArchiveLibs := baseLinkerProps.Whole_static_libs
libs = android.SortedUniqueStrings(libs)
deps.SetValueForArch(arch.Name, android.BazelLabelForModuleDeps(ctx, libs))
exportedDeps.SetValueForArch(arch.Name, android.BazelLabelForModuleDeps(ctx, exportedLibs))
linkopts.SetValueForArch(arch.Name, getBp2BuildLinkerFlags(baseLinkerProps))
wholeArchiveDeps.SetValueForArch(arch.Name, android.BazelLabelForModuleDeps(ctx, wholeArchiveLibs))
if baseLinkerProps.Version_script != nil {
versionScript.SetValueForArch(arch.Name,
android.BazelLabelForModuleSrcSingle(ctx, *baseLinkerProps.Version_script))
}
sharedLibs := baseLinkerProps.Shared_libs
dynamicDeps.SetValueForArch(arch.Name, android.BazelLabelForModuleDeps(ctx, sharedLibs))
}
}
for os, p := range module.GetTargetProperties(ctx, &BaseLinkerProperties{}) {
if baseLinkerProps, ok := p.(*BaseLinkerProperties); ok {
libs := baseLinkerProps.Header_libs
libs = append(libs, baseLinkerProps.Static_libs...)
exportedLibs := baseLinkerProps.Export_header_lib_headers
wholeArchiveLibs := baseLinkerProps.Whole_static_libs
libs = android.SortedUniqueStrings(libs)
wholeArchiveDeps.SetValueForOS(os.Name, android.BazelLabelForModuleDeps(ctx, wholeArchiveLibs))
deps.SetValueForOS(os.Name, android.BazelLabelForModuleDeps(ctx, libs))
exportedDeps.SetValueForOS(os.Name, android.BazelLabelForModuleDeps(ctx, exportedLibs))
linkopts.SetValueForOS(os.Name, getBp2BuildLinkerFlags(baseLinkerProps))
sharedLibs := baseLinkerProps.Shared_libs
dynamicDeps.SetValueForOS(os.Name, android.BazelLabelForModuleDeps(ctx, sharedLibs))
}
}
return linkerAttributes{
deps: deps,
exportedDeps: exportedDeps,
dynamicDeps: dynamicDeps,
wholeArchiveDeps: wholeArchiveDeps,
linkopts: linkopts,
versionScript: versionScript,
}
}
// Relativize a list of root-relative paths with respect to the module's
// directory.
//
// include_dirs Soong prop are root-relative (b/183742505), but
// local_include_dirs, export_include_dirs and export_system_include_dirs are
// module dir relative. This function makes a list of paths entirely module dir
// relative.
//
// For the `include` attribute, Bazel wants the paths to be relative to the
// module.
func bp2BuildMakePathsRelativeToModule(ctx android.BazelConversionPathContext, paths []string) []string {
var relativePaths []string
for _, path := range paths {
// Semantics of filepath.Rel: join(ModuleDir, rel(ModuleDir, path)) == path
relativePath, err := filepath.Rel(ctx.ModuleDir(), path)
if err != nil {
panic(err)
}
relativePaths = append(relativePaths, relativePath)
}
return relativePaths
}
// bp2BuildParseExportedIncludes creates a string list attribute contains the
// exported included directories of a module.
func bp2BuildParseExportedIncludes(ctx android.TopDownMutatorContext, module *Module) bazel.StringListAttribute {
libraryDecorator := module.linker.(*libraryDecorator)
// Export_system_include_dirs and export_include_dirs are already module dir
// relative, so they don't need to be relativized like include_dirs, which
// are root-relative.
includeDirs := libraryDecorator.flagExporter.Properties.Export_system_include_dirs
includeDirs = append(includeDirs, libraryDecorator.flagExporter.Properties.Export_include_dirs...)
includeDirsAttribute := bazel.MakeStringListAttribute(includeDirs)
for arch, props := range module.GetArchProperties(ctx, &FlagExporterProperties{}) {
if flagExporterProperties, ok := props.(*FlagExporterProperties); ok {
archIncludeDirs := flagExporterProperties.Export_system_include_dirs
archIncludeDirs = append(archIncludeDirs, flagExporterProperties.Export_include_dirs...)
// To avoid duplicate includes when base includes + arch includes are combined
// FIXME: This doesn't take conflicts between arch and os includes into account
archIncludeDirs = bazel.SubtractStrings(archIncludeDirs, includeDirs)
if len(archIncludeDirs) > 0 {
includeDirsAttribute.SetValueForArch(arch.Name, archIncludeDirs)
}
}
}
for os, props := range module.GetTargetProperties(ctx, &FlagExporterProperties{}) {
if flagExporterProperties, ok := props.(*FlagExporterProperties); ok {
osIncludeDirs := flagExporterProperties.Export_system_include_dirs
osIncludeDirs = append(osIncludeDirs, flagExporterProperties.Export_include_dirs...)
// To avoid duplicate includes when base includes + os includes are combined
// FIXME: This doesn't take conflicts between arch and os includes into account
osIncludeDirs = bazel.SubtractStrings(osIncludeDirs, includeDirs)
if len(osIncludeDirs) > 0 {
includeDirsAttribute.SetValueForOS(os.Name, osIncludeDirs)
}
}
}
return includeDirsAttribute
}