252 lines
9.0 KiB
Go
252 lines
9.0 KiB
Go
// Copyright 2016 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cc
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import (
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"android/soong/android"
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"fmt"
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"github.com/google/blueprint/proptools"
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)
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// This file contains the basic functionality for linking against static libraries and shared
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// libraries. Final linking into libraries or executables is handled in library.go, binary.go, etc.
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type BaseLinkerProperties struct {
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// list of modules whose object files should be linked into this module
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// in their entirety. For static library modules, all of the .o files from the intermediate
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// directory of the dependency will be linked into this modules .a file. For a shared library,
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// the dependency's .a file will be linked into this module using -Wl,--whole-archive.
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Whole_static_libs []string `android:"arch_variant,variant_prepend"`
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// list of modules that should be statically linked into this module.
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Static_libs []string `android:"arch_variant,variant_prepend"`
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// list of modules that should be dynamically linked into this module.
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Shared_libs []string `android:"arch_variant"`
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// list of modules that should only provide headers for this module.
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Header_libs []string `android:"arch_variant,variant_prepend"`
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// list of module-specific flags that will be used for all link steps
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Ldflags []string `android:"arch_variant"`
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// don't insert default compiler flags into asflags, cflags,
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// cppflags, conlyflags, ldflags, or include_dirs
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No_default_compiler_flags *bool
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// list of system libraries that will be dynamically linked to
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// shared library and executable modules. If unset, generally defaults to libc
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// and libm. Set to [] to prevent linking against libc and libm.
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System_shared_libs []string
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// allow the module to contain undefined symbols. By default,
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// modules cannot contain undefined symbols that are not satisified by their immediate
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// dependencies. Set this flag to true to remove --no-undefined from the linker flags.
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// This flag should only be necessary for compiling low-level libraries like libc.
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Allow_undefined_symbols *bool `android:"arch_variant"`
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// don't link in libgcc.a
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No_libgcc *bool
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// -l arguments to pass to linker for host-provided shared libraries
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Host_ldlibs []string `android:"arch_variant"`
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// list of shared libraries to re-export include directories from. Entries must be
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// present in shared_libs.
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Export_shared_lib_headers []string `android:"arch_variant"`
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// list of static libraries to re-export include directories from. Entries must be
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// present in static_libs.
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Export_static_lib_headers []string `android:"arch_variant"`
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// list of header libraries to re-export include directories from. Entries must be
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// present in header_libs.
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Export_header_lib_headers []string `android:"arch_variant"`
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// list of generated headers to re-export include directories from. Entries must be
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// present in generated_headers.
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Export_generated_headers []string `android:"arch_variant"`
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// don't link in crt_begin and crt_end. This flag should only be necessary for
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// compiling crt or libc.
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Nocrt *bool `android:"arch_variant"`
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// group static libraries. This can resolve missing symbols issues with interdependencies
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// between static libraries, but it is generally better to order them correctly instead.
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Group_static_libs *bool `android:"arch_variant"`
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Target struct {
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Vendor struct {
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// list of shared libs that should not be used to build
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// the vendor variant of the C/C++ module.
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Exclude_shared_libs []string
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}
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}
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}
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func NewBaseLinker() *baseLinker {
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return &baseLinker{}
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}
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// baseLinker provides support for shared_libs, static_libs, and whole_static_libs properties
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type baseLinker struct {
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Properties BaseLinkerProperties
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dynamicProperties struct {
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RunPaths []string `blueprint:"mutated"`
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}
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}
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func (linker *baseLinker) appendLdflags(flags []string) {
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linker.Properties.Ldflags = append(linker.Properties.Ldflags, flags...)
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}
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func (linker *baseLinker) linkerInit(ctx BaseModuleContext) {
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if ctx.toolchain().Is64Bit() {
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linker.dynamicProperties.RunPaths = append(linker.dynamicProperties.RunPaths, "../lib64", "lib64")
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} else {
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linker.dynamicProperties.RunPaths = append(linker.dynamicProperties.RunPaths, "../lib", "lib")
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}
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}
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func (linker *baseLinker) linkerProps() []interface{} {
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return []interface{}{&linker.Properties, &linker.dynamicProperties}
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}
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func (linker *baseLinker) linkerDeps(ctx BaseModuleContext, deps Deps) Deps {
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deps.WholeStaticLibs = append(deps.WholeStaticLibs, linker.Properties.Whole_static_libs...)
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deps.HeaderLibs = append(deps.HeaderLibs, linker.Properties.Header_libs...)
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deps.StaticLibs = append(deps.StaticLibs, linker.Properties.Static_libs...)
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deps.SharedLibs = append(deps.SharedLibs, linker.Properties.Shared_libs...)
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if ctx.vndk() {
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deps.SharedLibs = removeListFromList(deps.SharedLibs, linker.Properties.Target.Vendor.Exclude_shared_libs)
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}
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deps.ReexportHeaderLibHeaders = append(deps.ReexportHeaderLibHeaders, linker.Properties.Export_header_lib_headers...)
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deps.ReexportStaticLibHeaders = append(deps.ReexportStaticLibHeaders, linker.Properties.Export_static_lib_headers...)
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deps.ReexportSharedLibHeaders = append(deps.ReexportSharedLibHeaders, linker.Properties.Export_shared_lib_headers...)
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deps.ReexportGeneratedHeaders = append(deps.ReexportGeneratedHeaders, linker.Properties.Export_generated_headers...)
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if ctx.ModuleName() != "libcompiler_rt-extras" {
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deps.LateStaticLibs = append(deps.LateStaticLibs, "libcompiler_rt-extras")
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}
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if ctx.toolchain().Bionic() {
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// libgcc and libatomic have to be last on the command line
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deps.LateStaticLibs = append(deps.LateStaticLibs, "libatomic")
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if !Bool(linker.Properties.No_libgcc) {
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deps.LateStaticLibs = append(deps.LateStaticLibs, "libgcc")
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}
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if !ctx.static() {
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// libdl should always appear after libc in dt_needed list - see below
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// the only exception is when libc is not in linker.Properties.System_shared_libs
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// such as for libc module itself
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if inList("libc", linker.Properties.System_shared_libs) {
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_, deps.SharedLibs = removeFromList("libdl", deps.SharedLibs)
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}
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if linker.Properties.System_shared_libs != nil {
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if !inList("libdl", linker.Properties.System_shared_libs) &&
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inList("libc", linker.Properties.System_shared_libs) {
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linker.Properties.System_shared_libs = append(linker.Properties.System_shared_libs,
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"libdl")
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}
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deps.LateSharedLibs = append(deps.LateSharedLibs,
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linker.Properties.System_shared_libs...)
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} else if !ctx.sdk() && !ctx.vndk() {
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deps.LateSharedLibs = append(deps.LateSharedLibs, "libc", "libm", "libdl")
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}
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}
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if ctx.sdk() {
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deps.SharedLibs = append(deps.SharedLibs,
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"libc",
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"libm",
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"libdl",
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)
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}
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if ctx.vndk() {
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deps.LateSharedLibs = append(deps.LateSharedLibs, "libc", "libm", "libdl")
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}
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}
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if ctx.Windows() {
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deps.LateStaticLibs = append(deps.LateStaticLibs, "libwinpthread")
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}
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return deps
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}
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func (linker *baseLinker) linkerFlags(ctx ModuleContext, flags Flags) Flags {
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toolchain := ctx.toolchain()
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if !ctx.noDefaultCompilerFlags() {
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if Bool(linker.Properties.Allow_undefined_symbols) {
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if ctx.Darwin() {
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// darwin defaults to treating undefined symbols as errors
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flags.LdFlags = append(flags.LdFlags, "-Wl,-undefined,dynamic_lookup")
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}
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} else if !ctx.Darwin() {
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flags.LdFlags = append(flags.LdFlags, "-Wl,--no-undefined")
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}
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if flags.Clang {
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flags.LdFlags = append(flags.LdFlags, toolchain.ClangLdflags())
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} else {
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flags.LdFlags = append(flags.LdFlags, toolchain.Ldflags())
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}
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if !ctx.toolchain().Bionic() {
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CheckBadHostLdlibs(ctx, "host_ldlibs", linker.Properties.Host_ldlibs)
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flags.LdFlags = append(flags.LdFlags, linker.Properties.Host_ldlibs...)
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}
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}
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CheckBadLinkerFlags(ctx, "ldflags", linker.Properties.Ldflags)
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flags.LdFlags = append(flags.LdFlags, proptools.NinjaAndShellEscape(linker.Properties.Ldflags)...)
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if ctx.Host() {
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rpath_prefix := `\$$ORIGIN/`
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if ctx.Darwin() {
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rpath_prefix = "@loader_path/"
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}
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for _, rpath := range linker.dynamicProperties.RunPaths {
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flags.LdFlags = append(flags.LdFlags, "-Wl,-rpath,"+rpath_prefix+rpath)
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}
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}
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if flags.Clang {
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flags.LdFlags = append(flags.LdFlags, toolchain.ToolchainClangLdflags())
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} else {
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flags.LdFlags = append(flags.LdFlags, toolchain.ToolchainLdflags())
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}
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if Bool(linker.Properties.Group_static_libs) {
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flags.GroupStaticLibs = true
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}
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return flags
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}
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func (linker *baseLinker) link(ctx ModuleContext,
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flags Flags, deps PathDeps, objs Objects) android.Path {
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panic(fmt.Errorf("baseLinker doesn't know how to link"))
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}
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