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Commit e32f0931 authored by Colin Cross's avatar Colin Cross
Browse files

Support building rust modules against musl libc 

Add a rust toolchain for musl libc, use std library built from source,
and add default dependencies on musl libc.

Bug: 216192129
Test: m USE_HOST_MUSL=true host-native
Change-Id: Ic5ff4487db9693aeb08a13405f4d18465eecdc4b
parent 018cbebd

rust/binary.go

+12 −3
Original line number Diff line number Diff line
@@ -92,12 +92,21 @@ func (binary *binaryDecorator) compilerFlags(ctx ModuleContext, flags Flags) Fla 
func (binary *binaryDecorator) compilerDeps(ctx DepsContext, deps Deps) Deps {

	deps = binary.baseCompiler.compilerDeps(ctx, deps)



	static := Bool(binary.Properties.Static_executable)

	if ctx.toolchain().Bionic() {

		deps = bionicDeps(ctx, deps, Bool(binary.Properties.Static_executable))

		if Bool(binary.Properties.Static_executable) {

		deps = bionicDeps(ctx, deps, static)

		if static {

			deps.CrtBegin = []string{"crtbegin_static"}

		} else {

			deps.CrtBegin = []string{"libc_musl_crtbegin_dynamic"}

			deps.CrtBegin = []string{"crtbegin_dynamic"}

		}

		deps.CrtEnd = []string{"crtend_android"}

	} else if ctx.Os() == android.LinuxMusl {

		deps = muslDeps(ctx, deps, static)

		if static {

			deps.CrtBegin = []string{"libc_musl_crtbegin_static"}

		} else {

			deps.CrtBegin = []string{"libc_musl_crtbegin_dynamic", "musl_linker_script"}

		}

		deps.CrtEnd = []string{"libc_musl_crtend"}

	}

rust/bindgen.go

+2 −0
Original line number Diff line number Diff line
@@ -288,6 +288,8 @@ func (b *bindgenDecorator) SourceProviderDeps(ctx DepsContext, deps Deps) Deps { 
	deps = b.BaseSourceProvider.SourceProviderDeps(ctx, deps)

	if ctx.toolchain().Bionic() {

		deps = bionicDeps(ctx, deps, false)

	} else if ctx.Os() == android.LinuxMusl {

		deps = muslDeps(ctx, deps, false)

	}



	deps.SharedLibs = append(deps.SharedLibs, b.ClangProperties.Shared_libs...)

rust/compiler.go

+15 −1
Original line number Diff line number Diff line
@@ -364,7 +364,7 @@ func (compiler *baseCompiler) compilerDeps(ctx DepsContext, deps Deps) Deps { 
	if !Bool(compiler.Properties.No_stdlibs) {

		for _, stdlib := range config.Stdlibs {

			// If we're building for the build host, use the prebuilt stdlibs

			if ctx.Target().Os == ctx.Config().BuildOS {

			if ctx.Target().Os == android.Linux || ctx.Target().Os == android.Darwin {

				stdlib = "prebuilt_" + stdlib

			}

			deps.Stdlibs = append(deps.Stdlibs, stdlib)
@@ -394,6 +394,20 @@ func bionicDeps(ctx DepsContext, deps Deps, static bool) Deps { 
	return deps

}



func muslDeps(ctx DepsContext, deps Deps, static bool) Deps {

	muslLibs := []string{"libc_musl"}

	if static {

		deps.StaticLibs = append(deps.StaticLibs, muslLibs...)

	} else {

		deps.SharedLibs = append(deps.SharedLibs, muslLibs...)

	}

	if libRuntimeBuiltins := config.BuiltinsRuntimeLibrary(ctx.toolchain()); libRuntimeBuiltins != "" {

		deps.StaticLibs = append(deps.StaticLibs, libRuntimeBuiltins)

	}



	return deps

}



func (compiler *baseCompiler) crateName() string {

	return compiler.Properties.Crate_name

}

rust/config/x86_linux_host.go

+110 −30
Original line number Diff line number Diff line
@@ -22,12 +22,29 @@ import ( 


var (

	LinuxRustFlags     = []string{}

	LinuxMuslRustFlags = []string{

		// disable rustc's builtin fallbacks for crt objects

		"-C link_self_contained=no",

		// force rustc to use a dynamic musl libc

		"-C target-feature=-crt-static",

		"-Z link-native-libraries=no",

	}

	LinuxRustLinkFlags = []string{

		"-B${cc_config.ClangBin}",

		"-fuse-ld=lld",

		"-Wl,--undefined-version",

	}

	LinuxRustGlibcLinkFlags = []string{

		"--sysroot ${cc_config.LinuxGccRoot}/sysroot",

	}

	LinuxRustMuslLinkFlags = []string{

		"--sysroot /dev/null",

		"-nodefaultlibs",

		"-nostdlib",

		"-Wl,--no-dynamic-linker",

		// for unwind

		"-lgcc", "-lgcc_eh",

	}

	linuxX86Rustflags   = []string{}

	linuxX86Linkflags   = []string{}

	linuxX8664Rustflags = []string{}
@@ -35,15 +52,17 @@ var ( 
)



func init() {

	registerToolchainFactory(android.Linux, android.X86_64, linuxX8664ToolchainFactory)

	registerToolchainFactory(android.Linux, android.X86, linuxX86ToolchainFactory)

	registerToolchainFactory(android.Linux, android.X86_64, linuxGlibcX8664ToolchainFactory)

	registerToolchainFactory(android.Linux, android.X86, linuxGlibcX86ToolchainFactory)



	// TODO: musl rust support

	registerToolchainFactory(android.LinuxMusl, android.X86_64, linuxX8664ToolchainFactory)

	registerToolchainFactory(android.LinuxMusl, android.X86, linuxX86ToolchainFactory)

	registerToolchainFactory(android.LinuxMusl, android.X86_64, linuxMuslX8664ToolchainFactory)

	registerToolchainFactory(android.LinuxMusl, android.X86, linuxMuslX86ToolchainFactory)



	pctx.StaticVariable("LinuxToolchainRustFlags", strings.Join(LinuxRustFlags, " "))

	pctx.StaticVariable("LinuxMuslToolchainRustFlags", strings.Join(LinuxMuslRustFlags, " "))

	pctx.StaticVariable("LinuxToolchainLinkFlags", strings.Join(LinuxRustLinkFlags, " "))

	pctx.StaticVariable("LinuxGlibcToolchainLinkFlags", strings.Join(LinuxRustGlibcLinkFlags, " "))

	pctx.StaticVariable("LinuxMuslToolchainLinkFlags", strings.Join(LinuxRustMuslLinkFlags, " "))

	pctx.StaticVariable("LinuxToolchainX86RustFlags", strings.Join(linuxX86Rustflags, " "))

	pctx.StaticVariable("LinuxToolchainX86LinkFlags", strings.Join(linuxX86Linkflags, " "))

	pctx.StaticVariable("LinuxToolchainX8664RustFlags", strings.Join(linuxX8664Rustflags, " "))
@@ -51,19 +70,9 @@ func init() { 


}



type toolchainLinux struct {

	toolchainRustFlags string

	toolchainLinkFlags string

}



type toolchainLinuxX86 struct {

	toolchain32Bit

	toolchainLinux

}



// Base 64-bit linux rust toolchain

type toolchainLinuxX8664 struct {

	toolchain64Bit

	toolchainLinux

}



func (toolchainLinuxX8664) Supported() bool {
@@ -78,10 +87,6 @@ func (t *toolchainLinuxX8664) Name() string { 
	return "x86_64"

}



func (t *toolchainLinuxX8664) RustTriple() string {

	return "x86_64-unknown-linux-gnu"

}



func (t *toolchainLinuxX8664) ToolchainLinkFlags() string {

	// Prepend the lld flags from cc_config so we stay in sync with cc

	return "${cc_config.LinuxLldflags} ${cc_config.LinuxX8664Lldflags} " +
@@ -92,8 +97,49 @@ func (t *toolchainLinuxX8664) ToolchainRustFlags() string { 
	return "${config.LinuxToolchainRustFlags} ${config.LinuxToolchainX8664RustFlags}"

}



func linuxX8664ToolchainFactory(arch android.Arch) Toolchain {

	return toolchainLinuxX8664Singleton

// Specialization of the 64-bit linux rust toolchain for glibc.  Adds the gnu rust triple and

// sysroot linker flags.

type toolchainLinuxGlibcX8664 struct {

	toolchainLinuxX8664

}



func (t *toolchainLinuxX8664) RustTriple() string {

	return "x86_64-unknown-linux-gnu"

}



func (t *toolchainLinuxGlibcX8664) ToolchainLinkFlags() string {

	return t.toolchainLinuxX8664.ToolchainLinkFlags() + " " + "${config.LinuxGlibcToolchainLinkFlags}"

}



func linuxGlibcX8664ToolchainFactory(arch android.Arch) Toolchain {

	return toolchainLinuxGlibcX8664Singleton

}



// Specialization of the 64-bit linux rust toolchain for musl.  Adds the musl rust triple and

// linker flags to avoid using the host sysroot.

type toolchainLinuxMuslX8664 struct {

	toolchainLinuxX8664

}



func (t *toolchainLinuxMuslX8664) RustTriple() string {

	return "x86_64-unknown-linux-musl"

}



func (t *toolchainLinuxMuslX8664) ToolchainLinkFlags() string {

	return t.toolchainLinuxX8664.ToolchainLinkFlags() + " " + "${config.LinuxMuslToolchainLinkFlags}"

}



func (t *toolchainLinuxMuslX8664) ToolchainRustFlags() string {

	return t.toolchainLinuxX8664.ToolchainRustFlags() + " " + "${config.LinuxMuslToolchainRustFlags}"

}



func linuxMuslX8664ToolchainFactory(arch android.Arch) Toolchain {

	return toolchainLinuxMuslX8664Singleton

}



// Base 32-bit linux rust toolchain

type toolchainLinuxX86 struct {

	toolchain32Bit

}



func (toolchainLinuxX86) Supported() bool {
@@ -116,10 +162,6 @@ func (toolchainLinuxX8664) LibclangRuntimeLibraryArch() string { 
	return "x86_64"

}



func (t *toolchainLinuxX86) RustTriple() string {

	return "i686-unknown-linux-gnu"

}



func (t *toolchainLinuxX86) ToolchainLinkFlags() string {

	// Prepend the lld flags from cc_config so we stay in sync with cc

	return "${cc_config.LinuxLldflags} ${cc_config.LinuxX86Lldflags} " +
@@ -130,9 +172,47 @@ func (t *toolchainLinuxX86) ToolchainRustFlags() string { 
	return "${config.LinuxToolchainRustFlags} ${config.LinuxToolchainX86RustFlags}"

}



func linuxX86ToolchainFactory(arch android.Arch) Toolchain {

	return toolchainLinuxX86Singleton

// Specialization of the 32-bit linux rust toolchain for glibc.  Adds the gnu rust triple and

// sysroot linker flags.

type toolchainLinuxGlibcX86 struct {

	toolchainLinuxX86

}



func (t *toolchainLinuxGlibcX86) RustTriple() string {

	return "i686-unknown-linux-gnu"

}



func (t *toolchainLinuxGlibcX86) ToolchainLinkFlags() string {

	return t.toolchainLinuxX86.ToolchainLinkFlags() + " " + "${config.LinuxGlibcToolchainLinkFlags}"

}



func linuxGlibcX86ToolchainFactory(arch android.Arch) Toolchain {

	return toolchainLinuxGlibcX86Singleton

}



// Specialization of the 32-bit linux rust toolchain for musl.  Adds the musl rust triple and

// linker flags to avoid using the host sysroot.

type toolchainLinuxMuslX86 struct {

	toolchainLinuxX86

}



func (t *toolchainLinuxMuslX86) RustTriple() string {

	return "i686-unknown-linux-musl"

}



func (t *toolchainLinuxMuslX86) ToolchainLinkFlags() string {

	return t.toolchainLinuxX86.ToolchainLinkFlags() + " " + "${config.LinuxMuslToolchainLinkFlags}"

}



func (t *toolchainLinuxMuslX86) ToolchainRustFlags() string {

	return t.toolchainLinuxX86.ToolchainRustFlags() + " " + "${config.LinuxMuslToolchainRustFlags}"

}



func linuxMuslX86ToolchainFactory(arch android.Arch) Toolchain {

	return toolchainLinuxMuslX86Singleton

}



var toolchainLinuxX8664Singleton Toolchain = &toolchainLinuxX8664{}

var toolchainLinuxX86Singleton Toolchain = &toolchainLinuxX86{}
 
var toolchainLinuxGlibcX8664Singleton Toolchain = &toolchainLinuxGlibcX8664{}

var toolchainLinuxGlibcX86Singleton Toolchain = &toolchainLinuxGlibcX86{}

var toolchainLinuxMuslX8664Singleton Toolchain = &toolchainLinuxMuslX8664{}

var toolchainLinuxMuslX86Singleton Toolchain = &toolchainLinuxMuslX86{}

rust/library.go

+10 −4
Original line number Diff line number Diff line
@@ -426,10 +426,16 @@ func (library *libraryDecorator) compilerProps() []interface{} { 
func (library *libraryDecorator) compilerDeps(ctx DepsContext, deps Deps) Deps {

	deps = library.baseCompiler.compilerDeps(ctx, deps)



	if ctx.toolchain().Bionic() && (library.dylib() || library.shared()) {

	if library.dylib() || library.shared() {

		if ctx.toolchain().Bionic() {

			deps = bionicDeps(ctx, deps, false)

			deps.CrtBegin = []string{"crtbegin_so"}

			deps.CrtEnd = []string{"crtend_so"}

		} else if ctx.Os() == android.LinuxMusl {

			deps = muslDeps(ctx, deps, false)

			deps.CrtBegin = []string{"libc_musl_crtbegin_so"}

			deps.CrtEnd = []string{"libc_musl_crtend_so"}

		}

	}



	return deps