Rollup merge of #78929 - petrochenkov:linuxbase, r=joshtriplett

rustc_target: Move target env "gnu" from `linux_base` to `linux_gnu_base`

Follow up to #77729.

Changes the target spec hierarchy for Linux from
```
linux_base
├── linux_musl_base
└── linux_uclibc_base
```
where `linux_base` is really `linux_gnu_base` and the inheriting targets replace target env "gnu" with "musl"/"uclibc" to
```
linux_base
├── linux_gnu_base
├── linux_musl_base
└── linux_uclibc_base
```
which is slightly less confusing (I think).

compiler/rustc_target/src/spec/aarch64_unknown_linux_gnu.rs

@@ -1,7 +1,7 @@
 use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
-    let mut base = super::linux_base::opts();
+    let mut base = super::linux_gnu_base::opts();
     base.max_atomic_width = Some(128);
 
     Target {

compiler/rustc_target/src/spec/android_base.rs

@@ -1,7 +1,7 @@
 use crate::spec::{LinkerFlavor, TargetOptions};
 
 pub fn opts() -> TargetOptions {
-    let mut base = super::linux_base::opts();
+    let mut base = super::linux_gnu_base::opts();
     base.os = "android".to_string();
     // Many of the symbols defined in compiler-rt are also defined in libgcc.
     // Android's linker doesn't like that by default.

compiler/rustc_target/src/spec/arm_unknown_linux_gnueabi.rs

@@ -1,7 +1,7 @@
 use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
-    let mut base = super::linux_base::opts();
+    let mut base = super::linux_gnu_base::opts();
     base.max_atomic_width = Some(64);
     Target {
         llvm_target: "arm-unknown-linux-gnueabi".to_string(),

compiler/rustc_target/src/spec/arm_unknown_linux_gnueabihf.rs

@@ -1,7 +1,7 @@
 use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
-    let mut base = super::linux_base::opts();
+    let mut base = super::linux_gnu_base::opts();
     base.max_atomic_width = Some(64);
     Target {
         llvm_target: "arm-unknown-linux-gnueabihf".to_string(),

compiler/rustc_target/src/spec/armv4t_unknown_linux_gnueabi.rs

@@ -1,7 +1,7 @@
 use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
-    let base = super::linux_base::opts();
+    let base = super::linux_gnu_base::opts();
     Target {
         llvm_target: "armv4t-unknown-linux-gnueabi".to_string(),
         pointer_width: 32,

compiler/rustc_target/src/spec/armv5te_unknown_linux_gnueabi.rs

@@ -1,7 +1,7 @@
 use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
-    let base = super::linux_base::opts();
+    let base = super::linux_gnu_base::opts();
     Target {
         llvm_target: "armv5te-unknown-linux-gnueabi".to_string(),
         pointer_width: 32,

compiler/rustc_target/src/spec/armv7_unknown_linux_gnueabi.rs

@@ -4,7 +4,7 @@ use crate::spec::{Target, TargetOptions};
 // hardfloat.
 
 pub fn target() -> Target {
-    let base = super::linux_base::opts();
+    let base = super::linux_gnu_base::opts();
     Target {
         llvm_target: "armv7-unknown-linux-gnueabi".to_string(),
         pointer_width: 32,

compiler/rustc_target/src/spec/armv7_unknown_linux_gnueabihf.rs

@@ -4,7 +4,7 @@ use crate::spec::{Target, TargetOptions};
 // thumb-mode. See the thumbv7neon variant for enabling both.
 
 pub fn target() -> Target {
-    let base = super::linux_base::opts();
+    let base = super::linux_gnu_base::opts();
     Target {
         llvm_target: "armv7-unknown-linux-gnueabihf".to_string(),
         pointer_width: 32,

compiler/rustc_target/src/spec/i686_unknown_linux_gnu.rs

@@ -1,7 +1,7 @@
 use crate::spec::{LinkerFlavor, Target};
 
 pub fn target() -> Target {
-    let mut base = super::linux_base::opts();
+    let mut base = super::linux_gnu_base::opts();
     base.cpu = "pentium4".to_string();
     base.max_atomic_width = Some(64);
     base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-m32".to_string());

compiler/rustc_target/src/spec/linux_base.rs

@@ -20,7 +20,6 @@ pub fn opts() -> TargetOptions {
 
     TargetOptions {
         os: "linux".to_string(),
-        env: "gnu".to_string(),
         dynamic_linking: true,
         executables: true,
         os_family: Some("unix".to_string()),

compiler/rustc_target/src/spec/linux_gnu_base.rs

@@ -0,0 +1,5 @@
+use crate::spec::TargetOptions;
+
+pub fn opts() -> TargetOptions {
+    TargetOptions { env: "gnu".to_string(), ..super::linux_base::opts() }
+}

compiler/rustc_target/src/spec/mips64_unknown_linux_gnuabi64.rs

@@ -14,7 +14,7 @@ pub fn target() -> Target {
             max_atomic_width: Some(64),
             mcount: "_mcount".to_string(),
 
-            ..super::linux_base::opts()
+            ..super::linux_gnu_base::opts()
         },
     }
 }

compiler/rustc_target/src/spec/mips64el_unknown_linux_gnuabi64.rs

@@ -13,7 +13,7 @@ pub fn target() -> Target {
             max_atomic_width: Some(64),
             mcount: "_mcount".to_string(),
 
-            ..super::linux_base::opts()
+            ..super::linux_gnu_base::opts()
         },
     }
 }

compiler/rustc_target/src/spec/mips_unknown_linux_gnu.rs

@@ -13,7 +13,7 @@ pub fn target() -> Target {
             max_atomic_width: Some(32),
             mcount: "_mcount".to_string(),
 
-            ..super::linux_base::opts()
+            ..super::linux_gnu_base::opts()
         },
     }
 }

compiler/rustc_target/src/spec/mipsel_unknown_linux_gnu.rs

@@ -13,7 +13,7 @@ pub fn target() -> Target {
             max_atomic_width: Some(32),
             mcount: "_mcount".to_string(),
 
-            ..super::linux_base::opts()
+            ..super::linux_gnu_base::opts()
         },
     }
 }

compiler/rustc_target/src/spec/mipsisa32r6_unknown_linux_gnu.rs

@@ -13,7 +13,7 @@ pub fn target() -> Target {
             max_atomic_width: Some(32),
             mcount: "_mcount".to_string(),
 
-            ..super::linux_base::opts()
+            ..super::linux_gnu_base::opts()
         },
     }
 }

compiler/rustc_target/src/spec/mipsisa32r6el_unknown_linux_gnu.rs

@@ -13,7 +13,7 @@ pub fn target() -> Target {
             max_atomic_width: Some(32),
             mcount: "_mcount".to_string(),
 
-            ..super::linux_base::opts()
+            ..super::linux_gnu_base::opts()
         },
     }
 }

compiler/rustc_target/src/spec/mipsisa64r6_unknown_linux_gnuabi64.rs

@@ -14,7 +14,7 @@ pub fn target() -> Target {
             max_atomic_width: Some(64),
             mcount: "_mcount".to_string(),
 
-            ..super::linux_base::opts()
+            ..super::linux_gnu_base::opts()
         },
     }
 }

compiler/rustc_target/src/spec/mipsisa64r6el_unknown_linux_gnuabi64.rs

@@ -13,7 +13,7 @@ pub fn target() -> Target {
             max_atomic_width: Some(64),
             mcount: "_mcount".to_string(),
 
-            ..super::linux_base::opts()
+            ..super::linux_gnu_base::opts()
         },
     }
 }

compiler/rustc_target/src/spec/mod.rs

@@ -64,6 +64,7 @@ mod hermit_kernel_base;
 mod illumos_base;
 mod l4re_base;
 mod linux_base;
+mod linux_gnu_base;
 mod linux_kernel_base;
 mod linux_musl_base;
 mod linux_uclibc_base;

compiler/rustc_target/src/spec/powerpc64_unknown_linux_gnu.rs

@@ -1,7 +1,7 @@
 use crate::spec::{LinkerFlavor, RelroLevel, Target, TargetOptions};
 
 pub fn target() -> Target {
-    let mut base = super::linux_base::opts();
+    let mut base = super::linux_gnu_base::opts();
     base.cpu = "ppc64".to_string();
     base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-m64".to_string());
     base.max_atomic_width = Some(64);

compiler/rustc_target/src/spec/powerpc64le_unknown_linux_gnu.rs

@@ -1,7 +1,7 @@
 use crate::spec::{LinkerFlavor, Target, TargetOptions};
 
 pub fn target() -> Target {
-    let mut base = super::linux_base::opts();
+    let mut base = super::linux_gnu_base::opts();
     base.cpu = "ppc64le".to_string();
     base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-m64".to_string());
     base.max_atomic_width = Some(64);

compiler/rustc_target/src/spec/powerpc_unknown_linux_gnu.rs

@@ -1,7 +1,7 @@
 use crate::spec::{LinkerFlavor, Target, TargetOptions};
 
 pub fn target() -> Target {
-    let mut base = super::linux_base::opts();
+    let mut base = super::linux_gnu_base::opts();
     base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-m32".to_string());
     base.max_atomic_width = Some(32);
 

compiler/rustc_target/src/spec/powerpc_unknown_linux_gnuspe.rs

@@ -1,7 +1,7 @@
 use crate::spec::{LinkerFlavor, Target, TargetOptions};
 
 pub fn target() -> Target {
-    let mut base = super::linux_base::opts();
+    let mut base = super::linux_gnu_base::opts();
     base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-mspe".to_string());
     base.max_atomic_width = Some(32);
 

compiler/rustc_target/src/spec/riscv32gc_unknown_linux_gnu.rs

@@ -13,7 +13,7 @@ pub fn target() -> Target {
             features: "+m,+a,+f,+d,+c".to_string(),
             llvm_abiname: "ilp32d".to_string(),
             max_atomic_width: Some(32),
-            ..super::linux_base::opts()
+            ..super::linux_gnu_base::opts()
         },
     }
 }

compiler/rustc_target/src/spec/riscv64gc_unknown_linux_gnu.rs

@@ -13,7 +13,7 @@ pub fn target() -> Target {
             features: "+m,+a,+f,+d,+c".to_string(),
             llvm_abiname: "lp64d".to_string(),
             max_atomic_width: Some(64),
-            ..super::linux_base::opts()
+            ..super::linux_gnu_base::opts()
         },
     }
 }

compiler/rustc_target/src/spec/s390x_unknown_linux_gnu.rs

@@ -1,7 +1,7 @@
 use crate::spec::Target;
 
 pub fn target() -> Target {
-    let mut base = super::linux_base::opts();
+    let mut base = super::linux_gnu_base::opts();
     base.endian = "big".to_string();
     // z10 is the oldest CPU supported by LLVM
     base.cpu = "z10".to_string();

compiler/rustc_target/src/spec/sparc64_unknown_linux_gnu.rs

@@ -1,7 +1,7 @@
 use crate::spec::Target;
 
 pub fn target() -> Target {
-    let mut base = super::linux_base::opts();
+    let mut base = super::linux_gnu_base::opts();
     base.endian = "big".to_string();
     base.cpu = "v9".to_string();
     base.max_atomic_width = Some(64);

compiler/rustc_target/src/spec/sparc_unknown_linux_gnu.rs

@@ -1,7 +1,7 @@
 use crate::spec::{LinkerFlavor, Target};
 
 pub fn target() -> Target {
-    let mut base = super::linux_base::opts();
+    let mut base = super::linux_gnu_base::opts();
     base.endian = "big".to_string();
     base.cpu = "v9".to_string();
     base.max_atomic_width = Some(64);

compiler/rustc_target/src/spec/thumbv7neon_unknown_linux_gnueabihf.rs

@@ -7,7 +7,7 @@ use crate::spec::{Target, TargetOptions};
 // https://static.docs.arm.com/ddi0406/cd/DDI0406C_d_armv7ar_arm.pdf
 
 pub fn target() -> Target {
-    let base = super::linux_base::opts();
+    let base = super::linux_gnu_base::opts();
     Target {
         llvm_target: "armv7-unknown-linux-gnueabihf".to_string(),
         pointer_width: 32,

compiler/rustc_target/src/spec/x86_64_unknown_linux_gnu.rs

@@ -1,7 +1,7 @@
 use crate::spec::{LinkerFlavor, Target};
 
 pub fn target() -> Target {
-    let mut base = super::linux_base::opts();
+    let mut base = super::linux_gnu_base::opts();
     base.cpu = "x86-64".to_string();
     base.max_atomic_width = Some(64);
     base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-m64".to_string());

compiler/rustc_target/src/spec/x86_64_unknown_linux_gnux32.rs

@@ -1,7 +1,7 @@
 use crate::spec::{LinkerFlavor, Target};
 
 pub fn target() -> Target {
-    let mut base = super::linux_base::opts();
+    let mut base = super::linux_gnu_base::opts();
     base.cpu = "x86-64".to_string();
     base.max_atomic_width = Some(64);
     base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-mx32".to_string());