Rollup merge of #138431 - madsmtm:uclibc-llvm-target, r=jieyouxu

Fix `uclibc` LLVM target triples

`uclibc` is not an environment understood by LLVM, it is only a concept in Clang that can be selected with `-muclibc` (it affects which dynamic linker is passed to the static linker's `-dynamic-linker` flag).

In fact, using `uclibcgnueabi`/`uclibc` is actively harmful, as it prevents LLVM from seeing that the target is gnu-like; we should use `gnueabi`/`gnu` directly instead.

Motivation: To make it easier to verify that [`cc-rs`' conversion from `rustc` to Clang/LLVM triples](https://github.com/rust-lang/cc-rs/issues/1431) is correct.

**There are no target maintainers for these targets.** So I'll CC ``@lancethepants`` and ``@skrap`` who maintain the related `armv7-unknown-linux-uclibceabi` and `armv7-unknown-linux-uclibceabihf` (both of which already pass `-gnu` instead of `-uclibc`) in case they have any insights.

r? jieyouxu

4 files changed, 4 insertions, 4 deletions

diff --git a/compiler/rustc_target/src/spec/targets/armv5te_unknown_linux_uclibceabi.rs b/compiler/rustc_target/src/spec/targets/armv5te_unknown_linux_uclibceabi.rs
index dbe1540364a..860629b08e1 100644
--- a/compiler/rustc_target/src/spec/targets/armv5te_unknown_linux_uclibceabi.rs
+++ b/compiler/rustc_target/src/spec/targets/armv5te_unknown_linux_uclibceabi.rs
@@ -2,7 +2,7 @@ use crate::spec::{FloatAbi, Target, TargetMetadata, TargetOptions, base};
 
 pub(crate) fn target() -> Target {
     Target {
-        llvm_target: "armv5te-unknown-linux-uclibcgnueabi".into(),
+        llvm_target: "armv5te-unknown-linux-gnueabi".into(),
         metadata: TargetMetadata {
             description: Some("Armv5TE Linux with uClibc".into()),
             tier: Some(3),
diff --git a/compiler/rustc_target/src/spec/targets/mips_unknown_linux_uclibc.rs b/compiler/rustc_target/src/spec/targets/mips_unknown_linux_uclibc.rs
index 0955b3debea..c14bfbf46d2 100644
--- a/compiler/rustc_target/src/spec/targets/mips_unknown_linux_uclibc.rs
+++ b/compiler/rustc_target/src/spec/targets/mips_unknown_linux_uclibc.rs
@@ -4,7 +4,7 @@ use crate::spec::{Target, TargetMetadata, TargetOptions, base};
 
 pub(crate) fn target() -> Target {
     Target {
-        llvm_target: "mips-unknown-linux-uclibc".into(),
+        llvm_target: "mips-unknown-linux-gnu".into(),
         metadata: TargetMetadata {
             description: Some("MIPS Linux with uClibc".into()),
             tier: Some(3),
diff --git a/compiler/rustc_target/src/spec/targets/mipsel_unknown_linux_uclibc.rs b/compiler/rustc_target/src/spec/targets/mipsel_unknown_linux_uclibc.rs
index 08c4347fe01..f0056799d66 100644
--- a/compiler/rustc_target/src/spec/targets/mipsel_unknown_linux_uclibc.rs
+++ b/compiler/rustc_target/src/spec/targets/mipsel_unknown_linux_uclibc.rs
@@ -2,7 +2,7 @@ use crate::spec::{Target, TargetMetadata, TargetOptions, base};
 
 pub(crate) fn target() -> Target {
     Target {
-        llvm_target: "mipsel-unknown-linux-uclibc".into(),
+        llvm_target: "mipsel-unknown-linux-gnu".into(),
         metadata: TargetMetadata {
             description: Some("MIPS (LE) Linux with uClibc".into()),
             tier: Some(3),
diff --git a/compiler/rustc_target/src/spec/targets/x86_64_unknown_l4re_uclibc.rs b/compiler/rustc_target/src/spec/targets/x86_64_unknown_l4re_uclibc.rs
index a034a9fb244..4107249dcf1 100644
--- a/compiler/rustc_target/src/spec/targets/x86_64_unknown_l4re_uclibc.rs
+++ b/compiler/rustc_target/src/spec/targets/x86_64_unknown_l4re_uclibc.rs
@@ -8,7 +8,7 @@ pub(crate) fn target() -> Target {
     base.panic_strategy = PanicStrategy::Abort;
 
     Target {
-        llvm_target: "x86_64-unknown-l4re-uclibc".into(),
+        llvm_target: "x86_64-unknown-l4re-gnu".into(),
         metadata: TargetMetadata {
             description: None,
             tier: Some(3),