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
diff --git a/rust/config/x86_linux_host.go b/rust/config/x86_linux_host.go
index c10afd8..7608349 100644
--- a/rust/config/x86_linux_host.go
+++ b/rust/config/x86_linux_host.go
@@ -22,12 +22,29 @@
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 @@
)
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 @@
}
-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 @@
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} ${cc_config.LinuxX8664Lldflags} " +
@@ -92,8 +97,49 @@
return "${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 @@
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} ${cc_config.LinuxX86Lldflags} " +
@@ -130,9 +172,47 @@
return "${config.LinuxToolchainRustFlags} ${config.LinuxToolchainX86RustFlags}"
}
-func linuxX86ToolchainFactory(arch android.Arch) Toolchain {
- return toolchainLinuxX86Singleton
+// Specialization of the 32-bit linux rust toolchain for glibc. Adds the gnu rust triple and
+// sysroot linker flags.
+type toolchainLinuxGlibcX86 struct {
+ toolchainLinuxX86
}
-var toolchainLinuxX8664Singleton Toolchain = &toolchainLinuxX8664{}
-var toolchainLinuxX86Singleton Toolchain = &toolchainLinuxX86{}
+func (t *toolchainLinuxGlibcX86) RustTriple() string {
+ return "i686-unknown-linux-gnu"
+}
+
+func (t *toolchainLinuxGlibcX86) ToolchainLinkFlags() string {
+ return t.toolchainLinuxX86.ToolchainLinkFlags() + " " + "${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 toolchainLinuxGlibcX8664Singleton Toolchain = &toolchainLinuxGlibcX8664{}
+var toolchainLinuxGlibcX86Singleton Toolchain = &toolchainLinuxGlibcX86{}
+var toolchainLinuxMuslX8664Singleton Toolchain = &toolchainLinuxMuslX8664{}
+var toolchainLinuxMuslX86Singleton Toolchain = &toolchainLinuxMuslX86{}