add dynamically-linked musl targets

compiler/rustc_target/src/spec/aarch64_unknown_linux_dynmusl.rs

@@ -0,0 +1,11 @@
+use crate::spec::Target;
+
+pub fn target() -> Target {
+    let mut base = super::aarch64_unknown_linux_musl::target();
+
+    base.llvm_target = "aarch64-unknown-linux-musl".to_string();
+    base.options.crt_static_default = false;
+    base.options.static_position_independent_executables = true;
+
+    base
+}

compiler/rustc_target/src/spec/armv6_unknown_linux_dynmusleabihf.rs

@@ -0,0 +1,11 @@
+use crate::spec::Target;
+
+pub fn target() -> Target {
+    let mut base = super::arm_unknown_linux_musleabihf::target();
+
+    base.llvm_target = "armv6-unknown-linux-musleabihf".to_string();
+    base.options.crt_static_default = false;
+    base.options.static_position_independent_executables = true;
+
+    base
+}

compiler/rustc_target/src/spec/armv7_unknown_linux_dynmusleabihf.rs

@@ -0,0 +1,11 @@
+use crate::spec::Target;
+
+pub fn target() -> Target {
+    let mut base = super::armv7_unknown_linux_musleabihf::target();
+
+    base.llvm_target = "armv7-unknown-linux-musleabihf".to_string();
+    base.options.crt_static_default = false;
+    base.options.static_position_independent_executables = true;
+
+    base
+}

compiler/rustc_target/src/spec/i586_unknown_linux_dynmusl.rs

@@ -0,0 +1,12 @@
+use crate::spec::Target;
+
+pub fn target() -> Target {
+    let mut base = super::i686_unknown_linux_musl::target();
+
+    base.options.cpu = "pentium4".to_string();
+    base.llvm_target = "i586-unknown-linux-musl".to_string();
+    base.options.crt_static_default = false;
+    base.options.static_position_independent_executables = true;
+
+    base
+}

compiler/rustc_target/src/spec/mips64_unknown_linux_dynmuslabi64.rs

@@ -0,0 +1,11 @@
+use crate::spec::Target;
+
+pub fn target() -> Target {
+    let mut base = super::mips64_unknown_linux_muslabi64::target();
+
+    base.llvm_target = "mips64-unknown-linux-musl".to_string();
+    base.options.crt_static_default = false;
+    base.options.static_position_independent_executables = true;
+
+    base
+}

compiler/rustc_target/src/spec/mips64el_unknown_linux_dynmuslabi64.rs

@@ -0,0 +1,11 @@
+use crate::spec::Target;
+
+pub fn target() -> Target {
+    let mut base = super::mips64el_unknown_linux_muslabi64::target();
+
+    base.llvm_target = "mips64el-unknown-linux-musl".to_string();
+    base.options.crt_static_default = false;
+    base.options.static_position_independent_executables = true;
+
+    base
+}

compiler/rustc_target/src/spec/mips_unknown_linux_dynmusl.rs

@@ -0,0 +1,11 @@
+use crate::spec::Target;
+
+pub fn target() -> Target {
+    let mut base = super::mips_unknown_linux_musl::target();
+
+    base.llvm_target = "mips-unknown-linux-musl".to_string();
+    base.options.crt_static_default = false;
+    base.options.static_position_independent_executables = true;
+
+    base
+}

compiler/rustc_target/src/spec/mipsel_unknown_linux_dynmusl.rs

@@ -0,0 +1,11 @@
+use crate::spec::Target;
+
+pub fn target() -> Target {
+    let mut base = super::mipsel_unknown_linux_musl::target();
+
+    base.llvm_target = "mipsel-unknown-linux-musl".to_string();
+    base.options.crt_static_default = false;
+    base.options.static_position_independent_executables = true;
+
+    base
+}

compiler/rustc_target/src/spec/mod.rs

@@ -626,22 +626,28 @@ supported_targets! {
     ("i686-unknown-linux-gnu", i686_unknown_linux_gnu),
     ("i586-unknown-linux-gnu", i586_unknown_linux_gnu),
     ("mips-unknown-linux-gnu", mips_unknown_linux_gnu),
+    ("mips-unknown-linux-dynmusl", mips_unknown_linux_dynmusl),
     ("mips64-unknown-linux-gnuabi64", mips64_unknown_linux_gnuabi64),
     ("mips64el-unknown-linux-gnuabi64", mips64el_unknown_linux_gnuabi64),
     ("mipsisa32r6-unknown-linux-gnu", mipsisa32r6_unknown_linux_gnu),
     ("mipsisa32r6el-unknown-linux-gnu", mipsisa32r6el_unknown_linux_gnu),
     ("mipsisa64r6-unknown-linux-gnuabi64", mipsisa64r6_unknown_linux_gnuabi64),
     ("mipsisa64r6el-unknown-linux-gnuabi64", mipsisa64r6el_unknown_linux_gnuabi64),
     ("mipsel-unknown-linux-gnu", mipsel_unknown_linux_gnu),
+    ("mipsel-unknown-linux-dynmusl", mipsel_unknown_linux_dynmusl),
     ("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu),
     ("powerpc-unknown-linux-gnuspe", powerpc_unknown_linux_gnuspe),
     ("powerpc-unknown-linux-musl", powerpc_unknown_linux_musl),
+    ("powerpc-unknown-linux-dynmusl", powerpc_unknown_linux_dynmusl),
     ("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu),
     ("powerpc64-unknown-linux-musl", powerpc64_unknown_linux_musl),
+    ("powerpc64-unknown-linux-dynmusl", powerpc64_unknown_linux_dynmusl),
     ("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu),
     ("powerpc64le-unknown-linux-musl", powerpc64le_unknown_linux_musl),
+    ("powerpc64le-unknown-linux-dynmusl", powerpc64le_unknown_linux_dynmusl),
     ("s390x-unknown-linux-gnu", s390x_unknown_linux_gnu),
     ("s390x-unknown-linux-musl", s390x_unknown_linux_musl),
+    ("s390x-unknown-linux-dynmusl", s390x_unknown_linux_dynmusl),
     ("sparc-unknown-linux-gnu", sparc_unknown_linux_gnu),
     ("sparc64-unknown-linux-gnu", sparc64_unknown_linux_gnu),
     ("arm-unknown-linux-gnueabi", arm_unknown_linux_gnueabi),
@@ -656,17 +662,24 @@ supported_targets! {
     ("armv7-unknown-linux-gnueabihf", armv7_unknown_linux_gnueabihf),
     ("thumbv7neon-unknown-linux-gnueabihf", thumbv7neon_unknown_linux_gnueabihf),
     ("thumbv7neon-unknown-linux-musleabihf", thumbv7neon_unknown_linux_musleabihf),
+    ("armv6-unknown-linux-dynmusleabihf", armv6_unknown_linux_dynmusleabihf),
     ("armv7-unknown-linux-musleabi", armv7_unknown_linux_musleabi),
     ("armv7-unknown-linux-musleabihf", armv7_unknown_linux_musleabihf),
+    ("armv7-unknown-linux-dynmusleabihf", armv7_unknown_linux_dynmusleabihf),
     ("aarch64-unknown-linux-gnu", aarch64_unknown_linux_gnu),
     ("aarch64-unknown-linux-musl", aarch64_unknown_linux_musl),
+    ("aarch64-unknown-linux-dynmusl", aarch64_unknown_linux_dynmusl),
     ("x86_64-unknown-linux-musl", x86_64_unknown_linux_musl),
+    ("x86_64-unknown-linux-dynmusl", x86_64_unknown_linux_dynmusl),
     ("i686-unknown-linux-musl", i686_unknown_linux_musl),
     ("i586-unknown-linux-musl", i586_unknown_linux_musl),
+    ("i586-unknown-linux-dynmusl", i586_unknown_linux_dynmusl),
     ("mips-unknown-linux-musl", mips_unknown_linux_musl),
     ("mipsel-unknown-linux-musl", mipsel_unknown_linux_musl),
     ("mips64-unknown-linux-muslabi64", mips64_unknown_linux_muslabi64),
+    ("mips64-unknown-linux-dynmuslabi64", mips64_unknown_linux_dynmuslabi64),
     ("mips64el-unknown-linux-muslabi64", mips64el_unknown_linux_muslabi64),
+    ("mips64el-unknown-linux-dynmuslabi64", mips64el_unknown_linux_dynmuslabi64),
     ("hexagon-unknown-linux-musl", hexagon_unknown_linux_musl),
 
     ("mips-unknown-linux-uclibc", mips_unknown_linux_uclibc),

compiler/rustc_target/src/spec/powerpc64_unknown_linux_dynmusl.rs

@@ -0,0 +1,11 @@
+use crate::spec::Target;
+
+pub fn target() -> Target {
+    let mut base = super::powerpc64_unknown_linux_musl::target();
+
+    base.llvm_target = "powerpc64-unknown-linux-musl".to_string();
+    base.options.crt_static_default = false;
+    base.options.static_position_independent_executables = true;
+
+    base
+}

compiler/rustc_target/src/spec/powerpc64le_unknown_linux_dynmusl.rs

@@ -0,0 +1,11 @@
+use crate::spec::Target;
+
+pub fn target() -> Target {
+    let mut base = super::powerpc64le_unknown_linux_musl::target();
+
+    base.llvm_target = "powerpc64le-unknown-linux-musl".to_string();
+    base.options.crt_static_default = false;
+    base.options.static_position_independent_executables = true;
+
+    base
+}

compiler/rustc_target/src/spec/powerpc_unknown_linux_dynmusl.rs

@@ -0,0 +1,11 @@
+use crate::spec::Target;
+
+pub fn target() -> Target {
+    let mut base = super::powerpc_unknown_linux_musl::target();
+
+    base.llvm_target = "powerpc-unknown-linux-musl".to_string();
+    base.options.crt_static_default = false;
+    base.options.static_position_independent_executables = true;
+
+    base
+}

compiler/rustc_target/src/spec/s390x_unknown_linux_dynmusl.rs

@@ -0,0 +1,11 @@
+use crate::spec::Target;
+
+pub fn target() -> Target {
+    let mut base = super::s390x_unknown_linux_musl::target();
+
+    base.llvm_target = "s390x-unknown-linux-musl".to_string();
+    base.options.crt_static_default = false;
+    base.options.static_position_independent_executables = true;
+
+    base
+}

compiler/rustc_target/src/spec/x86_64_unknown_linux_dynmusl.rs

@@ -0,0 +1,11 @@
+use crate::spec::Target;
+
+pub fn target() -> Target {
+    let mut base = super::x86_64_unknown_linux_musl::target();
+
+    base.llvm_target = "x86_64-unknown-linux-musl".to_string();
+    base.options.crt_static_default = false;
+    base.options.static_position_independent_executables = true;
+
+    base
+}

src/doc/rustc/src/platform-support.md

@@ -158,6 +158,7 @@ target | std | host | notes
 `aarch64-unknown-freebsd` | ✓ | ✓ | ARM64 FreeBSD
 `aarch64-unknown-hermit` | ? |  |
 `aarch64-unknown-linux-gnu_ilp32` | ✓ | ✓ | ARM64 Linux (ILP32 ABI)
+`aarch64-unknown-linux-dynmusl` |   |   | ARM64 Linux (Musl with dynamic linking)
 `aarch64-unknown-netbsd` | ✓ | ✓ |
 `aarch64-unknown-openbsd` | ✓ | ✓ | ARM64 OpenBSD
 `aarch64-unknown-redox` | ? |  | ARM64 Redox OS
@@ -168,16 +169,19 @@ target | std | host | notes
 `armv4t-unknown-linux-gnueabi` | ? |  |
 `armv5te-unknown-linux-uclibceabi` | ? |  | ARMv5TE Linux with uClibc
 `armv6-unknown-freebsd` | ✓ | ✓ | ARMv6 FreeBSD
+`armv6-unknown-linux-dynmusleabihf` |   |   | ARMv6 Linux (Musl with dynamic linking)
 `armv6-unknown-netbsd-eabihf` | ? |  |
 `armv7-apple-ios` | ✓ |  | ARMv7 iOS, Cortex-a8
 `armv7-unknown-freebsd` | ✓ | ✓ | ARMv7 FreeBSD
+`armv7-unknown-linux-dynmusleabihf` |   |   | ARMv7 Linux (Musl with dynamic linking)
 `armv7-unknown-netbsd-eabihf` | ✓ | ✓ |
 `armv7-wrs-vxworks-eabihf` | ? |  |
 `armv7a-none-eabihf` | * | | ARM Cortex-A, hardfloat
 `armv7s-apple-ios` | ✓ |  |
 `avr-unknown-gnu-atmega328` | ✗ |  | AVR. Requires `-Z build-std=core`
 `hexagon-unknown-linux-musl` | ? |  |
 `i386-apple-ios` | ✓ |  | 32-bit x86 iOS
+`i586-unknown-linux-dynmusl` |   |   | 32-bit Pentium-class x86 Linux (Musl with dynamic linking)
 `i686-apple-darwin` | ✓ | ✓ | 32-bit macOS (10.7+, Lion+)
 `i686-pc-windows-msvc` | ✓ |  | 32-bit Windows XP support
 `i686-unknown-uefi` | ? |  | 32-bit UEFI
@@ -187,28 +191,36 @@ target | std | host | notes
 `i686-uwp-windows-gnu` | ? |  |
 `i686-uwp-windows-msvc` | ? |  |
 `i686-wrs-vxworks` | ? |  |
+`mips-unknown-linux-dynmusl` |   |  | MIPS Linux, o32 ABI, MUSL with dynamic linking
 `mips-unknown-linux-uclibc` | ✓ |  | MIPS Linux with uClibc
+`mipsel-unknown-linux-dynmusl` |   |  | MIPS (LE) Linux, o32 ABI, MUSL with dynamic linking
 `mipsel-unknown-linux-uclibc` | ✓ |  | MIPS (LE) Linux with uClibc
 `mipsel-unknown-none` | * |  | Bare MIPS (LE) softfloat
 `mipsel-sony-psp` | * |  | MIPS (LE) Sony PlayStation Portable (PSP)
+`mips64-unknown-linux-dynmuslabi64` |   |  | MIPS64 Linux, n64 ABI, MUSL with dynamic linking
+`mips64el-unknown-linux-dynmuslabi64` |   |  | MIPS64 (LE) Linux, n64 ABI, MUSL with dynamic linking
 `mipsisa32r6-unknown-linux-gnu` | ? |  |
 `mipsisa32r6el-unknown-linux-gnu` | ? |  |
 `mipsisa64r6-unknown-linux-gnuabi64` | ? |  |
 `mipsisa64r6el-unknown-linux-gnuabi64` | ? |  |
 `msp430-none-elf` | * |  | 16-bit MSP430 microcontrollers
 `powerpc-unknown-linux-gnuspe` | ✓ |  | PowerPC SPE Linux
 `powerpc-unknown-linux-musl` | ? |  |
+`powerpc-unknown-linux-dynmusl` |   |  |
 `powerpc-unknown-netbsd` | ✓ | ✓ |
 `powerpc-wrs-vxworks` | ? |  |
 `powerpc-wrs-vxworks-spe` | ? |  |
 `powerpc64-unknown-freebsd` | ✓ | ✓ | PPC64 FreeBSD (ELFv1 and ELFv2)
 `powerpc64-unknown-linux-musl` | ? |  |
+`powerpc64-unknown-linux-dynmusl` |  |  |
 `powerpc64-wrs-vxworks` | ? |  |
 `powerpc64le-unknown-linux-musl` | ? |  |
+`powerpc64le-unknown-linux-dynmusl` |  |  |
 `riscv64gc-unknown-linux-musl` |   |   | RISC-V Linux (kernel 4.20, musl 1.2.0)
 `riscv32gc-unknown-linux-gnu` |   |   | RISC-V Linux (kernel 5.4, glibc 2.33)
 `riscv32gc-unknown-linux-musl` |   |   | RISC-V Linux (kernel 5.4, musl + RISCV32 support patches)
 `s390x-unknown-linux-musl` |  |  | S390x Linux (kernel 2.6.32, MUSL)
+`s390x-unknown-linux-dynmusl` |  |  | S390x Linux (kernel 2.6.32, MUSL with dynamic linking)
 `sparc-unknown-linux-gnu` | ✓ |  | 32-bit SPARC Linux
 `sparc64-unknown-netbsd` | ✓ | ✓ | NetBSD/sparc64
 `sparc64-unknown-openbsd` | ? |  |
@@ -226,6 +238,7 @@ target | std | host | notes
 `x86_64-unknown-hermit` | ? |  |
 `x86_64-unknown-hermit-kernel` | ? |  | HermitCore kernel
 `x86_64-unknown-l4re-uclibc` | ? |  |
+`x86_64-unknown-linux-dynmusl` |   |   | 64-bit x86 Linux, MUSL with dynamic linking
 `x86_64-unknown-openbsd` | ✓ | ✓ | 64-bit OpenBSD
 `x86_64-unknown-uefi` | ? |  |
 `x86_64-uwp-windows-gnu` | ✓ |  |