Rollup merge of rust-lang#133386 - wesleywiser:update_musl_base_crt_default, r=jieyouxu

Update linux_musl base to dynamically link the crt by default

However, don't change the behavior of any existing targets at this time. For targets that used the old default, explicitly set `crt_static_default = true`.

This makes it easier for new targets to use the correct defaults while leaving the changing of individual targets to future PRs.

Related to rust-lang/compiler-team#422

Author: matthiaskrgr

compiler/rustc_target/src/spec/base/linux_musl.rs

@@ -8,8 +8,5 @@ pub(crate) fn opts() -> TargetOptions {
     base.post_link_objects_self_contained = crt_objects::post_musl_self_contained();
     base.link_self_contained = LinkSelfContainedDefault::InferredForMusl;
 
-    // These targets statically link libc by default
-    base.crt_static_default = true;
-
     base
 }

compiler/rustc_target/src/spec/targets/aarch64_unknown_linux_musl.rs

@@ -12,6 +12,9 @@ pub(crate) fn target() -> Target {
         | SanitizerSet::MEMORY
         | SanitizerSet::THREAD;
 
+    // FIXME(compiler-team#422): musl targets should be dynamically linked by default.
+    base.crt_static_default = true;
+
     Target {
         llvm_target: "aarch64-unknown-linux-musl".into(),
         metadata: crate::spec::TargetMetadata {

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

@@ -22,6 +22,8 @@ pub(crate) fn target() -> Target {
             features: "+strict-align,+v6".into(),
             max_atomic_width: Some(64),
             mcount: "\u{1}mcount".into(),
+            // FIXME(compiler-team#422): musl targets should be dynamically linked by default.
+            crt_static_default: true,
             ..base::linux_musl::opts()
         },
     }

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

@@ -22,6 +22,8 @@ pub(crate) fn target() -> Target {
             features: "+strict-align,+v6,+vfp2,-d32".into(),
             max_atomic_width: Some(64),
             mcount: "\u{1}mcount".into(),
+            // FIXME(compiler-team#422): musl targets should be dynamically linked by default.
+            crt_static_default: true,
             ..base::linux_musl::opts()
         },
     }

compiler/rustc_target/src/spec/targets/armv5te_unknown_linux_musleabi.rs

@@ -23,6 +23,8 @@ pub(crate) fn target() -> Target {
             max_atomic_width: Some(32),
             mcount: "\u{1}mcount".into(),
             has_thumb_interworking: true,
+            // FIXME(compiler-team#422): musl targets should be dynamically linked by default.
+            crt_static_default: true,
             ..base::linux_musl::opts()
         },
     }

compiler/rustc_target/src/spec/targets/armv7_unknown_linux_musleabi.rs

@@ -26,6 +26,8 @@ pub(crate) fn target() -> Target {
             features: "+v7,+thumb2,+soft-float,-neon".into(),
             max_atomic_width: Some(64),
             mcount: "\u{1}mcount".into(),
+            // FIXME(compiler-team#422): musl targets should be dynamically linked by default.
+            crt_static_default: true,
             ..base::linux_musl::opts()
         },
     }

compiler/rustc_target/src/spec/targets/armv7_unknown_linux_musleabihf.rs

@@ -25,6 +25,8 @@ pub(crate) fn target() -> Target {
             features: "+v7,+vfp3,-d32,+thumb2,-neon".into(),
             max_atomic_width: Some(64),
             mcount: "\u{1}mcount".into(),
+            // FIXME(compiler-team#422): musl targets should be dynamically linked by default.
+            crt_static_default: true,
             ..base::linux_musl::opts()
         },
     }

compiler/rustc_target/src/spec/targets/i586_unknown_linux_musl.rs

@@ -4,5 +4,7 @@ pub(crate) fn target() -> Target {
     let mut base = super::i686_unknown_linux_musl::target();
     base.cpu = "pentium".into();
     base.llvm_target = "i586-unknown-linux-musl".into();
+    // FIXME(compiler-team#422): musl targets should be dynamically linked by default.
+    base.crt_static_default = true;
     base
 }

compiler/rustc_target/src/spec/targets/i686_unknown_linux_musl.rs

@@ -6,6 +6,8 @@ pub(crate) fn target() -> Target {
     base.max_atomic_width = Some(64);
     base.add_pre_link_args(LinkerFlavor::Gnu(Cc::Yes, Lld::No), &["-m32", "-Wl,-melf_i386"]);
     base.stack_probes = StackProbeType::Inline;
+    // FIXME(compiler-team#422): musl targets should be dynamically linked by default.
+    base.crt_static_default = true;
 
     // The unwinder used by i686-unknown-linux-musl, the LLVM libunwind
     // implementation, apparently relies on frame pointers existing... somehow.

compiler/rustc_target/src/spec/targets/mips64_openwrt_linux_musl.rs

@@ -8,7 +8,6 @@ pub(crate) fn target() -> Target {
     base.cpu = "mips64r2".into();
     base.features = "+mips64r2,+soft-float".into();
     base.max_atomic_width = Some(64);
-    base.crt_static_default = false;
 
     Target {
         // LLVM doesn't recognize "muslabi64" yet.