Update targets to use target_abi

All eabi targets have target_abi = "eabi".
All eabihf targets have target_abi = "eabihf".
armv6_unknown_freebsd and armv7_unknown_freebsd have target_abi = "eabihf".
All abi64 targets have target_abi = "abi64".
All ilp32 targets have target_abi = "ilp32".
All softfloat targets have target_abi = "softfloat".
All *-uwp-windows-* targets have target_abi = "uwp".
All spe targets have target_abi = "spe".
All macabi targets have target_abi = "macabi".
aarch64-apple-ios-sim has target_abi = "sim".
x86_64-fortanix-unknown-sgx has target_abi = "fortanix".
x86_64-unknown-linux-gnux32 has target_abi = "x32".

Add FIXME entries for targets for which existing values need to change
once cfg_target_abi becomes stable. (All of them are tier 3 targets.)

Add a test for target_abi in `--print cfg`.

compiler/rustc_target/src/spec/aarch64_be_unknown_linux_gnu_ilp32.rs

@@ -10,6 +10,11 @@ pub fn target() -> Target {
         pointer_width: 32,
         data_layout: "E-m:e-p:32:32-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
         arch: "aarch64".to_string(),
-        options: TargetOptions { mcount: "\u{1}_mcount".to_string(), endian: Endian::Big, ..base },
+        options: TargetOptions {
+            abi: "ilp32".to_string(),
+            mcount: "\u{1}_mcount".to_string(),
+            endian: Endian::Big,
+            ..base
+        },
     }
 }

compiler/rustc_target/src/spec/aarch64_unknown_linux_gnu_ilp32.rs

@@ -7,6 +7,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".to_string(),
         arch: "aarch64".to_string(),
         options: TargetOptions {
+            abi: "ilp32".to_string(),
             max_atomic_width: Some(128),
             mcount: "\u{1}_mcount".to_string(),
             ..super::linux_gnu_base::opts()

compiler/rustc_target/src/spec/aarch64_unknown_none_softfloat.rs

@@ -10,6 +10,7 @@ use super::{LinkerFlavor, LldFlavor, PanicStrategy, RelocModel, Target, TargetOp
 
 pub fn target() -> Target {
     let opts = TargetOptions {
+        abi: "softfloat".to_string(),
         linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
         linker: Some("rust-lld".to_owned()),
         features: "+strict-align,-neon,-fp-armv8".to_string(),

compiler/rustc_target/src/spec/apple_sdk_base.rs

@@ -14,6 +14,15 @@ pub enum Arch {
     Arm64_sim,
 }
 
+fn target_abi(arch: Arch) -> String {
+    match arch {
+        Armv7 | Armv7s | Arm64 | I386 | X86_64 => "",
+        X86_64_macabi | Arm64_macabi => "macabi",
+        Arm64_sim => "sim",
+    }
+    .to_string()
+}
+
 fn target_cpu(arch: Arch) -> String {
     match arch {
         Armv7 => "cortex-a8", // iOS7 is supported on iPhone 4 and higher
@@ -39,6 +48,7 @@ fn link_env_remove(arch: Arch) -> Vec<String> {
 
 pub fn opts(os: &str, arch: Arch) -> TargetOptions {
     TargetOptions {
+        abi: target_abi(arch),
         cpu: target_cpu(arch),
         dynamic_linking: false,
         executables: true,

compiler/rustc_target/src/spec/arm_linux_androideabi.rs

@@ -7,6 +7,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabi".to_string(),
             // https://developer.android.com/ndk/guides/abis.html#armeabi
             features: "+strict-align,+v5te".to_string(),
             max_atomic_width: Some(32),

compiler/rustc_target/src/spec/arm_unknown_linux_gnueabi.rs

@@ -7,6 +7,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabi".to_string(),
             features: "+strict-align,+v6".to_string(),
             max_atomic_width: Some(64),
             mcount: "\u{1}__gnu_mcount_nc".to_string(),

compiler/rustc_target/src/spec/arm_unknown_linux_gnueabihf.rs

@@ -7,6 +7,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabihf".to_string(),
             features: "+strict-align,+v6,+vfp2,-d32".to_string(),
             max_atomic_width: Some(64),
             mcount: "\u{1}__gnu_mcount_nc".to_string(),

compiler/rustc_target/src/spec/arm_unknown_linux_musleabi.rs

@@ -10,6 +10,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabi".to_string(),
             // Most of these settings are copied from the arm_unknown_linux_gnueabi
             // target.
             features: "+strict-align,+v6".to_string(),

compiler/rustc_target/src/spec/arm_unknown_linux_musleabihf.rs

@@ -10,6 +10,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabihf".to_string(),
             // Most of these settings are copied from the arm_unknown_linux_gnueabihf
             // target.
             features: "+strict-align,+v6,+vfp2,-d32".to_string(),

compiler/rustc_target/src/spec/armebv7r_none_eabi.rs

@@ -11,6 +11,7 @@ pub fn target() -> Target {
         data_layout: "E-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabi".to_string(),
             endian: Endian::Big,
             linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
             executables: true,

compiler/rustc_target/src/spec/armebv7r_none_eabihf.rs

@@ -11,6 +11,7 @@ pub fn target() -> Target {
         data_layout: "E-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabihf".to_string(),
             endian: Endian::Big,
             linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
             executables: true,

compiler/rustc_target/src/spec/armv4t_unknown_linux_gnueabi.rs

@@ -7,6 +7,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabi".to_string(),
             features: "+soft-float,+strict-align".to_string(),
             // Atomic operations provided by compiler-builtins
             max_atomic_width: Some(32),

compiler/rustc_target/src/spec/armv5te_unknown_linux_gnueabi.rs

@@ -7,6 +7,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabi".to_string(),
             features: "+soft-float,+strict-align".to_string(),
             // Atomic operations provided by compiler-builtins
             max_atomic_width: Some(32),

compiler/rustc_target/src/spec/armv5te_unknown_linux_musleabi.rs

@@ -11,6 +11,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabi".to_string(),
             features: "+soft-float,+strict-align".to_string(),
             // Atomic operations provided by compiler-builtins
             max_atomic_width: Some(32),

compiler/rustc_target/src/spec/armv5te_unknown_linux_uclibceabi.rs

@@ -7,6 +7,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabi".to_string(),
             features: "+soft-float,+strict-align".to_string(),
             // Atomic operations provided by compiler-builtins
             max_atomic_width: Some(32),

compiler/rustc_target/src/spec/armv6_unknown_freebsd.rs

@@ -7,6 +7,8 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabihf".to_string(),
+            // FIXME: change env to "gnu" when cfg_target_abi becomes stable
             env: "gnueabihf".to_string(),
             features: "+v6,+vfp2,-d32".to_string(),
             max_atomic_width: Some(64),

compiler/rustc_target/src/spec/armv6_unknown_netbsd_eabihf.rs

@@ -7,6 +7,8 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabihf".to_string(),
+            // FIXME: remove env when cfg_target_abi becomes stable
             env: "eabihf".to_string(),
             features: "+v6,+vfp2,-d32".to_string(),
             max_atomic_width: Some(64),

compiler/rustc_target/src/spec/armv7_linux_androideabi.rs

@@ -17,6 +17,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabi".to_string(),
             features: "+v7,+thumb-mode,+thumb2,+vfp3,-d32,-neon".to_string(),
             max_atomic_width: Some(64),
             ..base

compiler/rustc_target/src/spec/armv7_unknown_freebsd.rs

@@ -7,6 +7,8 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabihf".to_string(),
+            // FIXME: change env to "gnu" when cfg_target_abi becomes stable
             env: "gnueabihf".to_string(),
             features: "+v7,+vfp3,-d32,+thumb2,-neon".to_string(),
             max_atomic_width: Some(64),

compiler/rustc_target/src/spec/armv7_unknown_linux_gnueabi.rs

@@ -10,6 +10,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabi".to_string(),
             features: "+v7,+thumb2,+soft-float,-neon".to_string(),
             max_atomic_width: Some(64),
             mcount: "\u{1}__gnu_mcount_nc".to_string(),

compiler/rustc_target/src/spec/armv7_unknown_linux_gnueabihf.rs

@@ -10,6 +10,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabihf".to_string(),
             // Info about features at https://wiki.debian.org/ArmHardFloatPort
             features: "+v7,+vfp3,-d32,+thumb2,-neon".to_string(),
             max_atomic_width: Some(64),

compiler/rustc_target/src/spec/armv7_unknown_linux_musleabi.rs

@@ -16,6 +16,7 @@ pub fn target() -> Target {
         arch: "arm".to_string(),
 
         options: TargetOptions {
+            abi: "eabi".to_string(),
             features: "+v7,+thumb2,+soft-float,-neon".to_string(),
             max_atomic_width: Some(64),
             mcount: "\u{1}mcount".to_string(),

compiler/rustc_target/src/spec/armv7_unknown_linux_musleabihf.rs

@@ -15,6 +15,7 @@ pub fn target() -> Target {
         // Most of these settings are copied from the armv7_unknown_linux_gnueabihf
         // target.
         options: TargetOptions {
+            abi: "eabihf".to_string(),
             features: "+v7,+vfp3,-d32,+thumb2,-neon".to_string(),
             max_atomic_width: Some(64),
             mcount: "\u{1}mcount".to_string(),

compiler/rustc_target/src/spec/armv7_unknown_netbsd_eabihf.rs

@@ -7,6 +7,8 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabihf".to_string(),
+            // FIXME: remove env when cfg_target_abi becomes stable
             env: "eabihf".to_string(),
             features: "+v7,+vfp3,-d32,+thumb2,-neon".to_string(),
             max_atomic_width: Some(64),

compiler/rustc_target/src/spec/armv7_wrs_vxworks_eabihf.rs

@@ -7,6 +7,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabihf".to_string(),
             // Info about features at https://wiki.debian.org/ArmHardFloatPort
             features: "+v7,+vfp3,-d32,+thumb2,-neon".to_string(),
             max_atomic_width: Some(64),

compiler/rustc_target/src/spec/armv7a_none_eabi.rs

@@ -18,6 +18,7 @@ use super::{LinkerFlavor, LldFlavor, PanicStrategy, RelocModel, Target, TargetOp
 
 pub fn target() -> Target {
     let opts = TargetOptions {
+        abi: "eabi".to_string(),
         linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
         linker: Some("rust-lld".to_owned()),
         features: "+v7,+thumb2,+soft-float,-neon,+strict-align".to_string(),

compiler/rustc_target/src/spec/armv7a_none_eabihf.rs

@@ -9,6 +9,7 @@ use super::{LinkerFlavor, LldFlavor, PanicStrategy, RelocModel, Target, TargetOp
 
 pub fn target() -> Target {
     let opts = TargetOptions {
+        abi: "eabihf".to_string(),
         linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
         linker: Some("rust-lld".to_owned()),
         features: "+v7,+vfp3,-d32,+thumb2,-neon,+strict-align".to_string(),

compiler/rustc_target/src/spec/armv7r_none_eabi.rs

@@ -11,6 +11,7 @@ pub fn target() -> Target {
         arch: "arm".to_string(),
 
         options: TargetOptions {
+            abi: "eabi".to_string(),
             linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
             executables: true,
             linker: Some("rust-lld".to_owned()),

compiler/rustc_target/src/spec/armv7r_none_eabihf.rs

@@ -11,6 +11,7 @@ pub fn target() -> Target {
         arch: "arm".to_string(),
 
         options: TargetOptions {
+            abi: "eabihf".to_string(),
             linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
             executables: true,
             linker: Some("rust-lld".to_owned()),

compiler/rustc_target/src/spec/mips64_unknown_linux_gnuabi64.rs

@@ -8,6 +8,7 @@ pub fn target() -> Target {
         data_layout: "E-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128".to_string(),
         arch: "mips64".to_string(),
         options: TargetOptions {
+            abi: "abi64".to_string(),
             endian: Endian::Big,
             // NOTE(mips64r2) matches C toolchain
             cpu: "mips64r2".to_string(),

compiler/rustc_target/src/spec/mips64_unknown_linux_muslabi64.rs

@@ -12,6 +12,11 @@ pub fn target() -> Target {
         pointer_width: 64,
         data_layout: "E-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128".to_string(),
         arch: "mips64".to_string(),
-        options: TargetOptions { endian: Endian::Big, mcount: "_mcount".to_string(), ..base },
+        options: TargetOptions {
+            abi: "abi64".to_string(),
+            endian: Endian::Big,
+            mcount: "_mcount".to_string(),
+            ..base
+        },
     }
 }

compiler/rustc_target/src/spec/mips64el_unknown_linux_gnuabi64.rs

@@ -7,6 +7,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128".to_string(),
         arch: "mips64".to_string(),
         options: TargetOptions {
+            abi: "abi64".to_string(),
             // NOTE(mips64r2) matches C toolchain
             cpu: "mips64r2".to_string(),
             features: "+mips64r2".to_string(),

compiler/rustc_target/src/spec/mips64el_unknown_linux_muslabi64.rs

@@ -11,6 +11,6 @@ pub fn target() -> Target {
         pointer_width: 64,
         data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128".to_string(),
         arch: "mips64".to_string(),
-        options: TargetOptions { mcount: "_mcount".to_string(), ..base },
+        options: TargetOptions { abi: "abi64".to_string(), mcount: "_mcount".to_string(), ..base },
     }
 }

compiler/rustc_target/src/spec/mipsisa64r6_unknown_linux_gnuabi64.rs

@@ -8,6 +8,7 @@ pub fn target() -> Target {
         data_layout: "E-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128".to_string(),
         arch: "mips64".to_string(),
         options: TargetOptions {
+            abi: "abi64".to_string(),
             endian: Endian::Big,
             // NOTE(mips64r6) matches C toolchain
             cpu: "mips64r6".to_string(),

compiler/rustc_target/src/spec/mipsisa64r6el_unknown_linux_gnuabi64.rs

@@ -7,6 +7,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128".to_string(),
         arch: "mips64".to_string(),
         options: TargetOptions {
+            abi: "abi64".to_string(),
             // NOTE(mips64r6) matches C toolchain
             cpu: "mips64r6".to_string(),
             features: "+mips64r6".to_string(),

compiler/rustc_target/src/spec/powerpc_unknown_linux_gnuspe.rs

@@ -11,6 +11,11 @@ pub fn target() -> Target {
         pointer_width: 32,
         data_layout: "E-m:e-p:32:32-i64:64-n32".to_string(),
         arch: "powerpc".to_string(),
-        options: TargetOptions { endian: Endian::Big, mcount: "_mcount".to_string(), ..base },
+        options: TargetOptions {
+            abi: "spe".to_string(),
+            endian: Endian::Big,
+            mcount: "_mcount".to_string(),
+            ..base
+        },
     }
 }

compiler/rustc_target/src/spec/powerpc_wrs_vxworks_spe.rs

@@ -13,6 +13,7 @@ pub fn target() -> Target {
         data_layout: "E-m:e-p:32:32-i64:64-n32".to_string(),
         arch: "powerpc".to_string(),
         options: TargetOptions {
+            abi: "spe".to_string(),
             endian: Endian::Big,
             // feature msync would disable instruction 'fsync' which is not supported by fsl_p1p2
             features: "+secure-plt,+msync".to_string(),

compiler/rustc_target/src/spec/thumbv4t_none_eabi.rs

@@ -26,6 +26,7 @@ pub fn target() -> Target {
          */
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         options: TargetOptions {
+            abi: "eabi".to_string(),
             linker_flavor: LinkerFlavor::Ld,
             linker: Some("arm-none-eabi-ld".to_string()),
 

compiler/rustc_target/src/spec/thumbv6m_none_eabi.rs

@@ -10,6 +10,7 @@ pub fn target() -> Target {
         arch: "arm".to_string(),
 
         options: TargetOptions {
+            abi: "eabi".to_string(),
             // The ARMv6-M architecture doesn't support unaligned loads/stores so we disable them
             // with +strict-align.
             features: "+strict-align".to_string(),

compiler/rustc_target/src/spec/thumbv7em_none_eabi.rs

@@ -18,6 +18,10 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
 
-        options: TargetOptions { max_atomic_width: Some(32), ..super::thumb_base::opts() },
+        options: TargetOptions {
+            abi: "eabi".to_string(),
+            max_atomic_width: Some(32),
+            ..super::thumb_base::opts()
+        },
     }
 }

compiler/rustc_target/src/spec/thumbv7em_none_eabihf.rs

@@ -18,6 +18,7 @@ pub fn target() -> Target {
         arch: "arm".to_string(),
 
         options: TargetOptions {
+            abi: "eabihf".to_string(),
             // `+vfp4` is the lowest common denominator between the Cortex-M4 (vfp4-16) and the
             // Cortex-M7 (vfp5)
             // `-d32` both the Cortex-M4 and the Cortex-M7 only have 16 double-precision registers

compiler/rustc_target/src/spec/thumbv7m_none_eabi.rs

@@ -9,6 +9,10 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
 
-        options: TargetOptions { max_atomic_width: Some(32), ..super::thumb_base::opts() },
+        options: TargetOptions {
+            abi: "eabi".to_string(),
+            max_atomic_width: Some(32),
+            ..super::thumb_base::opts()
+        },
     }
 }

compiler/rustc_target/src/spec/thumbv7neon_linux_androideabi.rs

@@ -17,6 +17,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabi".to_string(),
             features: "+v7,+thumb-mode,+thumb2,+vfp3,+neon".to_string(),
             max_atomic_width: Some(64),
             ..base

compiler/rustc_target/src/spec/thumbv7neon_unknown_linux_gnueabihf.rs

@@ -13,6 +13,7 @@ pub fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".to_string(),
         arch: "arm".to_string(),
         options: TargetOptions {
+            abi: "eabihf".to_string(),
             // Info about features at https://wiki.debian.org/ArmHardFloatPort
             features: "+v7,+thumb-mode,+thumb2,+vfp3,+neon".to_string(),
             max_atomic_width: Some(64),