Fix "std" support status of some tier 3 targets

Author: taiki-e

compiler/rustc_target/src/spec/targets/powerpc64le_unknown_freebsd.rs

@@ -13,7 +13,7 @@ pub(crate) fn target() -> Target {
             description: Some("PPC64LE FreeBSD".into()),
             tier: Some(3),
             host_tools: Some(false),
-            std: Some(false),
+            std: None,
         },
         pointer_width: 64,
         data_layout: "e-m:e-Fn32-i64:64-n32:64".into(),

compiler/rustc_target/src/spec/targets/powerpc_unknown_freebsd.rs

@@ -17,7 +17,7 @@ pub(crate) fn target() -> Target {
             description: Some("PowerPC FreeBSD".into()),
             tier: Some(3),
             host_tools: Some(false),
-            std: Some(false),
+            std: None,
         },
         pointer_width: 32,
         data_layout: "E-m:e-p:32:32-Fn32-i64:64-n32".into(),

compiler/rustc_target/src/spec/targets/riscv32gc_unknown_linux_gnu.rs

@@ -9,7 +9,7 @@ pub(crate) fn target() -> Target {
             description: Some("RISC-V Linux (kernel 5.4, glibc 2.33)".into()),
             tier: Some(3),
             host_tools: Some(false),
-            std: Some(false),
+            std: Some(true),
         },
         pointer_width: 32,
         data_layout: "e-m:e-p:32:32-i64:64-n32-S128".into(),

compiler/rustc_target/src/spec/targets/riscv32gc_unknown_linux_musl.rs

@@ -11,7 +11,7 @@ pub(crate) fn target() -> Target {
             ),
             tier: Some(3),
             host_tools: Some(false),
-            std: Some(false),
+            std: None,
         },
         pointer_width: 32,
         data_layout: "e-m:e-p:32:32-i64:64-n32-S128".into(),

compiler/rustc_target/src/spec/targets/riscv64_linux_android.rs

@@ -9,7 +9,7 @@ pub(crate) fn target() -> Target {
             description: Some("RISC-V 64-bit Android".into()),
             tier: Some(3),
             host_tools: Some(false),
-            std: Some(false),
+            std: None,
         },
         pointer_width: 64,
         data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),

compiler/rustc_target/src/spec/targets/riscv64gc_unknown_freebsd.rs

@@ -7,7 +7,7 @@ pub(crate) fn target() -> Target {
             description: Some("RISC-V FreeBSD".into()),
             tier: Some(3),
             host_tools: Some(false),
-            std: Some(false),
+            std: None,
         },
         pointer_width: 64,
         data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),

compiler/rustc_target/src/spec/targets/riscv64gc_unknown_fuchsia.rs

@@ -7,7 +7,7 @@ pub(crate) fn target() -> Target {
             description: Some("RISC-V Fuchsia".into()),
             tier: Some(3),
             host_tools: Some(false),
-            std: Some(false),
+            std: None,
         },
         pointer_width: 64,
         data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),

compiler/rustc_target/src/spec/targets/riscv64gc_unknown_linux_musl.rs

@@ -9,7 +9,7 @@ pub(crate) fn target() -> Target {
             description: Some("RISC-V Linux (kernel 4.20, musl 1.2.3)".into()),
             tier: Some(3),
             host_tools: Some(false),
-            std: Some(false),
+            std: Some(true),
         },
         pointer_width: 64,
         data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),

compiler/rustc_target/src/spec/targets/s390x_unknown_linux_musl.rs

@@ -19,7 +19,7 @@ pub(crate) fn target() -> Target {
             description: Some("S390x Linux (kernel 3.2, musl 1.2.3)".into()),
             tier: Some(3),
             host_tools: Some(false),
-            std: Some(false),
+            std: Some(true),
         },
         pointer_width: 64,
         data_layout: "E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-v128:64-a:8:16-n32:64".into(),

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

@@ -344,15 +344,15 @@ target | std | host | notes
 [`powerpc-wrs-vxworks-spe`](platform-support/vxworks.md) | ✓ |  |
 [`powerpc-wrs-vxworks`](platform-support/vxworks.md) | ✓ |  |
 `powerpc64-unknown-freebsd` | ✓ | ✓ | PPC64 FreeBSD (ELFv1 and ELFv2)
-`powerpc64le-unknown-freebsd` |   |   | PPC64LE FreeBSD
-`powerpc-unknown-freebsd` |   |   | PowerPC FreeBSD
+`powerpc64le-unknown-freebsd` | ? |   | PPC64LE FreeBSD
+`powerpc-unknown-freebsd` | ? |   | PowerPC FreeBSD
 `powerpc64-unknown-linux-musl` | ? |  | 64-bit PowerPC Linux with musl 1.2.3
 [`powerpc64-wrs-vxworks`](platform-support/vxworks.md) | ✓ |  |
 `powerpc64le-unknown-linux-musl` | ? |  | 64-bit PowerPC Linux with musl 1.2.3, Little Endian
 [`powerpc64-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | OpenBSD/powerpc64
 [`powerpc64-ibm-aix`](platform-support/aix.md) | ? |  | 64-bit AIX (7.2 and newer)
-`riscv32gc-unknown-linux-gnu` |   |   | RISC-V Linux (kernel 5.4, glibc 2.33)
-`riscv32gc-unknown-linux-musl` |   |   | RISC-V Linux (kernel 5.4, musl 1.2.3 + RISCV32 support patches)
+`riscv32gc-unknown-linux-gnu` | ✓ |   | RISC-V Linux (kernel 5.4, glibc 2.33)
+`riscv32gc-unknown-linux-musl` | ? |   | RISC-V Linux (kernel 5.4, musl 1.2.3 + RISCV32 support patches)
 [`riscv32im-risc0-zkvm-elf`](platform-support/riscv32im-risc0-zkvm-elf.md) | ? |  | RISC Zero's zero-knowledge Virtual Machine (RV32IM ISA)
 [`riscv32ima-unknown-none-elf`](platform-support/riscv32-unknown-none-elf.md) | * |  | Bare RISC-V (RV32IMA ISA)
 [`riscv32imac-unknown-xous-elf`](platform-support/riscv32imac-unknown-xous-elf.md) | ? |  | RISC-V Xous (RV32IMAC ISA)
@@ -361,13 +361,13 @@ target | std | host | notes
 [`riscv32imafc-esp-espidf`](platform-support/esp-idf.md) | ✓ |  | RISC-V ESP-IDF
 [`riscv32-wrs-vxworks`](platform-support/vxworks.md) | ✓ |  |
 [`riscv64gc-unknown-hermit`](platform-support/hermit.md) | ✓ |   | RISC-V Hermit
-`riscv64gc-unknown-freebsd` |   |   | RISC-V FreeBSD
-`riscv64gc-unknown-fuchsia` |   |   | RISC-V Fuchsia
+`riscv64gc-unknown-freebsd` | ? |   | RISC-V FreeBSD
+`riscv64gc-unknown-fuchsia` | ? |   | RISC-V Fuchsia
 [`riscv64gc-unknown-netbsd`](platform-support/netbsd.md) | ✓ | ✓ | RISC-V NetBSD
 [`riscv64gc-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | OpenBSD/riscv64
-[`riscv64-linux-android`](platform-support/android.md) |   |   | RISC-V 64-bit Android
+[`riscv64-linux-android`](platform-support/android.md) | ? |   | RISC-V 64-bit Android
 [`riscv64-wrs-vxworks`](platform-support/vxworks.md) | ✓ |  |
-[`s390x-unknown-linux-musl`](platform-support/s390x-unknown-linux-musl.md) |  |  | S390x Linux (kernel 3.2, musl 1.2.3)
+[`s390x-unknown-linux-musl`](platform-support/s390x-unknown-linux-musl.md) | ✓ |  | S390x Linux (kernel 3.2, musl 1.2.3)
 `sparc-unknown-linux-gnu` | ✓ |  | 32-bit SPARC Linux
 [`sparc-unknown-none-elf`](./platform-support/sparc-unknown-none-elf.md) | * |  | Bare 32-bit SPARC V7+
 [`sparc64-unknown-netbsd`](platform-support/netbsd.md) | ✓ | ✓ | NetBSD/sparc64