diff --git a/src/cargo/core/compiler/mod.rs b/src/cargo/core/compiler/mod.rs
index 5dc34616d91..93859e914b9 100644
--- a/src/cargo/core/compiler/mod.rs
+++ b/src/cargo/core/compiler/mod.rs
@@ -696,10 +696,8 @@ fn prepare_rustc(build_runner: &BuildRunner<'_, '_>, unit: &Unit) -> CargoResult
     base.inherit_jobserver(&build_runner.jobserver);
     build_deps_args(&mut base, build_runner, unit)?;
     add_cap_lints(build_runner.bcx, unit, &mut base);
-    if cargo_rustc_higher_args_precedence(build_runner) {
-        if let Some(args) = build_runner.bcx.extra_args_for(unit) {
-            base.args(args);
-        }
+    if let Some(args) = build_runner.bcx.extra_args_for(unit) {
+        base.args(args);
     }
     base.args(&unit.rustflags);
     if build_runner.bcx.gctx.cli_unstable().binary_dep_depinfo {
@@ -754,12 +752,6 @@ fn prepare_rustdoc(build_runner: &BuildRunner<'_, '_>, unit: &Unit) -> CargoResu
 
     rustdoc.args(unit.pkg.manifest().lint_rustflags());
 
-    if !cargo_rustc_higher_args_precedence(build_runner) {
-        if let Some(args) = build_runner.bcx.extra_args_for(unit) {
-            rustdoc.args(args);
-        }
-    }
-
     let metadata = build_runner.metadata_for_doc_units[unit];
     rustdoc
         .arg("-C")
@@ -800,10 +792,8 @@ fn prepare_rustdoc(build_runner: &BuildRunner<'_, '_>, unit: &Unit) -> CargoResu
 
     rustdoc::add_output_format(build_runner, unit, &mut rustdoc)?;
 
-    if cargo_rustc_higher_args_precedence(build_runner) {
-        if let Some(args) = build_runner.bcx.extra_args_for(unit) {
-            rustdoc.args(args);
-        }
+    if let Some(args) = build_runner.bcx.extra_args_for(unit) {
+        rustdoc.args(args);
     }
     rustdoc.args(&unit.rustdocflags);
 
@@ -1107,11 +1097,6 @@ fn build_base_args(
 
     cmd.args(unit.pkg.manifest().lint_rustflags());
     cmd.args(&profile_rustflags);
-    if !cargo_rustc_higher_args_precedence(build_runner) {
-        if let Some(args) = build_runner.bcx.extra_args_for(unit) {
-            cmd.args(args);
-        }
-    }
 
     // `-C overflow-checks` is implied by the setting of `-C debug-assertions`,
     // so we only need to provide `-C overflow-checks` if it differs from
@@ -2007,19 +1992,3 @@ fn scrape_output_path(build_runner: &BuildRunner<'_, '_>, unit: &Unit) -> CargoR
         .outputs(unit)
         .map(|outputs| outputs[0].path.clone())
 }
-
-/// Provides a way to change the precedence of `cargo rustc -- <flags>`.
-///
-/// This is intended to be a short-live function.
-///
-/// See <https://github.com/rust-lang/cargo/issues/14346>
-fn cargo_rustc_higher_args_precedence(build_runner: &BuildRunner<'_, '_>) -> bool {
-    build_runner.bcx.gctx.nightly_features_allowed
-        && build_runner
-            .bcx
-            .gctx
-            .get_env("__CARGO_RUSTC_ORIG_ARGS_PRIO")
-            .ok()
-            .as_deref()
-            != Some("1")
-}
diff --git a/tests/testsuite/rustc.rs b/tests/testsuite/rustc.rs
index 2041c006706..34d00b7833f 100644
--- a/tests/testsuite/rustc.rs
+++ b/tests/testsuite/rustc.rs
@@ -28,7 +28,7 @@ fn lib() {
     p.cargo("rustc --lib -v -- -C debug-assertions=off")
         .with_stderr_data(str![[r#"
 [COMPILING] foo v0.0.1 ([ROOT]/foo)
-[RUNNING] `rustc --crate-name foo --edition=2015 src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C debuginfo=2 [..]-C debug-assertions=off[..]-C metadata=[..] [..]--out-dir [ROOT]/foo/target/debug/deps -L dependency=[ROOT]/foo/target/debug/deps`
+[RUNNING] `rustc --crate-name foo --edition=2015 src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C debuginfo=2 [..]-C metadata=[..] [..]--out-dir [ROOT]/foo/target/debug/deps -L dependency=[ROOT]/foo/target/debug/deps[..]-C debug-assertions=off[..]`
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 
 "#]])
@@ -46,7 +46,7 @@ fn build_main_and_allow_unstable_options() {
         .with_stderr_data(str![[r#"
 [COMPILING] foo v0.0.1 ([ROOT]/foo)
 [RUNNING] `rustc --crate-name foo --edition=2015 src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C debuginfo=2 [..]-C metadata=[..] --out-dir [ROOT]/foo/target/debug/deps -L dependency=[ROOT]/foo/target/debug/deps`
-[RUNNING] `rustc --crate-name foo --edition=2015 src/main.rs [..]--crate-type bin --emit=[..]link[..]-C debuginfo=2 [..]-C debug-assertions[..]-C metadata=[..] --out-dir [ROOT]/foo/target/debug/deps -L dependency=[ROOT]/foo/target/debug/deps --extern foo=[ROOT]/foo/target/debug/deps/libfoo-[HASH].rlib`
+[RUNNING] `rustc --crate-name foo --edition=2015 src/main.rs [..]--crate-type bin --emit=[..]link[..]-C debuginfo=2 [..]-C metadata=[..] --out-dir [ROOT]/foo/target/debug/deps -L dependency=[ROOT]/foo/target/debug/deps --extern foo=[ROOT]/foo/target/debug/deps/libfoo-[HASH].rlib[..]-C debug-assertions[..]`
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 
 "#]])
@@ -83,7 +83,7 @@ fn build_with_args_to_one_of_multiple_binaries() {
         .with_stderr_data(str![[r#"
 [COMPILING] foo v0.0.1 ([ROOT]/foo)
 [RUNNING] `rustc --crate-name foo --edition=2015 src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C debuginfo=2 [..]-C metadata=[..] --out-dir [..]`
-[RUNNING] `rustc --crate-name bar --edition=2015 src/bin/bar.rs [..]--crate-type bin --emit=[..]link[..]-C debuginfo=2 [..]-C debug-assertions [..]`
+[RUNNING] `rustc --crate-name bar --edition=2015 src/bin/bar.rs [..]--crate-type bin --emit=[..]link[..]-C debuginfo=2 [..]-C debug-assertions[..]`
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 
 "#]])
@@ -358,7 +358,7 @@ fn build_with_args_to_one_of_multiple_tests() {
         .with_stderr_data(str![[r#"
 [COMPILING] foo v0.0.1 ([ROOT]/foo)
 [RUNNING] `rustc --crate-name foo --edition=2015 src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C debuginfo=2 [..]-C metadata=[..] --out-dir [..]`
-[RUNNING] `rustc --crate-name bar --edition=2015 tests/bar.rs [..]--emit=[..]link[..]-C debuginfo=2 [..]-C debug-assertions --test[..]`
+[RUNNING] `rustc --crate-name bar --edition=2015 tests/bar.rs [..]--emit=[..]link[..]-C debuginfo=2 [..]--test[..]-C debug-assertions[..]`
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 
 "#]])
@@ -395,7 +395,7 @@ fn build_foo_with_bar_dependency() {
 [COMPILING] bar v0.1.0 ([ROOT]/bar)
 [RUNNING] `rustc --crate-name bar [..] -C debuginfo=2[..]`
 [COMPILING] foo v0.0.1 ([ROOT]/foo)
-[RUNNING] `rustc --crate-name foo [..] -C debuginfo=2 [..]-C debug-assertions [..]`
+[RUNNING] `rustc --crate-name foo [..] -C debuginfo=2 [..]-C debug-assertions[..]`
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 
 "#]])
@@ -430,7 +430,7 @@ fn build_only_bar_dependency() {
         .with_stderr_data(str![[r#"
 [LOCKING] 1 package to latest compatible version
 [COMPILING] bar v0.1.0 ([ROOT]/bar)
-[RUNNING] `rustc --crate-name bar [..]--crate-type lib [..] -C debug-assertions [..]`
+[RUNNING] `rustc --crate-name bar [..]--crate-type lib [..] -C debug-assertions[..]`
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 
 "#]])
@@ -599,7 +599,7 @@ fn rustc_fingerprint() {
     p.cargo("rustc -v -- -C debug-assertions")
         .with_stderr_data(str![[r#"
 [COMPILING] foo v0.5.0 ([ROOT]/foo)
-[RUNNING] `rustc --crate-name foo [..]-C debug-assertions [..]`
+[RUNNING] `rustc --crate-name foo [..]-C debug-assertions[..]`
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 
 "#]])
@@ -657,7 +657,7 @@ fn rustc_test_with_implicit_bin() {
         .with_stderr_data(
             str![[r#"
 [COMPILING] foo v0.5.0 ([ROOT]/foo)
-[RUNNING] `rustc --crate-name test1 --edition=2015 tests/test1.rs [..] --cfg foo [..]`
+[RUNNING] `rustc --crate-name test1 --edition=2015 tests/test1.rs [..] --cfg foo[..]`
 [RUNNING] `rustc --crate-name foo --edition=2015 src/main.rs [..]`
 ...
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
@@ -816,7 +816,6 @@ fn precedence() {
 
     p.cargo("rustc --release -v -- --cfg cargo_rustc -C strip=symbols")
         .env("RUSTFLAGS", "--cfg from_rustflags")
-        .masquerade_as_nightly_cargo(&["cargo-rustc-precedence"])
         .with_stderr_data(str![[r#"
 [COMPILING] foo v0.0.0 ([ROOT]/foo)
 [RUNNING] `rustc [..]-C strip=debuginfo [..]--cfg cargo_rustc -C strip=symbols --cfg from_rustflags`
@@ -824,34 +823,4 @@ fn precedence() {
 
 "#]])
         .run();
-
-    // Ensure the short-live env var to work
-    p.cargo("clean").run();
-    p.cargo("rustc --release -v -- --cfg cargo_rustc -C strip=symbols")
-        .env("RUSTFLAGS", "--cfg from_rustflags")
-        .env("__CARGO_RUSTC_ORIG_ARGS_PRIO", "1")
-        .masquerade_as_nightly_cargo(&["cargo-rustc-precedence"])
-        .with_stderr_data(
-            str![[r#"
-[COMPILING] foo v0.0.0 ([ROOT]/foo)
-[RUNNING] `rustc [..]--cfg cargo_rustc -C strip=symbols [..]-C strip=debuginfo [..]--cfg from_rustflags`
-[FINISHED] `release` profile [optimized] target(s) in [ELAPSED]s
-
-"#]]
-        )
-        .run();
-
-    // Ensure non-nightly to work as before
-    p.cargo("clean").run();
-    p.cargo("rustc --release -v -- --cfg cargo_rustc -C strip=symbols")
-        .env("RUSTFLAGS", "--cfg from_rustflags")
-        .with_stderr_data(
-            str![[r#"
-[COMPILING] foo v0.0.0 ([ROOT]/foo)
-[RUNNING] `rustc [..]--cfg cargo_rustc -C strip=symbols [..]-C strip=debuginfo [..]--cfg from_rustflags`
-[FINISHED] `release` profile [optimized] target(s) in [ELAPSED]s
-
-"#]]
-        )
-        .run();
 }
diff --git a/tests/testsuite/rustdoc.rs b/tests/testsuite/rustdoc.rs
index 3a7977cb8cc..a502dd27222 100644
--- a/tests/testsuite/rustdoc.rs
+++ b/tests/testsuite/rustdoc.rs
@@ -106,7 +106,7 @@ fn rustdoc_args() {
     p.cargo("rustdoc -v -- --cfg=foo")
         .with_stderr_data(str![[r#"
 [DOCUMENTING] foo v0.0.1 ([ROOT]/foo)
-[RUNNING] `rustdoc [..] --crate-name foo src/lib.rs -o [ROOT]/foo/target/doc [..] --cfg=foo -C metadata=[..] -L dependency=[ROOT]/foo/target/debug/deps [..]`
+[RUNNING] `rustdoc [..] --crate-name foo src/lib.rs -o [ROOT]/foo/target/doc [..]-C metadata=[..] -L dependency=[ROOT]/foo/target/debug/deps [..]--cfg=foo[..]`
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 [GENERATED] [ROOT]/foo/target/doc/foo/index.html
 
@@ -159,7 +159,7 @@ fn rustdoc_foo_with_bar_dependency() {
 [CHECKING] bar v0.0.1 ([ROOT]/bar)
 [RUNNING] `rustc [..] [ROOT]/bar/src/lib.rs [..]`
 [DOCUMENTING] foo v0.0.1 ([ROOT]/foo)
-[RUNNING] `rustdoc [..] --crate-name foo src/lib.rs -o [ROOT]/foo/target/doc [..] --cfg=foo -C metadata=[..] -L dependency=[ROOT]/foo/target/debug/deps --extern [..]`
+[RUNNING] `rustdoc [..] --crate-name foo src/lib.rs -o [ROOT]/foo/target/doc [..]-C metadata=[..] -L dependency=[ROOT]/foo/target/debug/deps --extern [..]--cfg=foo[..]`
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 [GENERATED] [ROOT]/foo/target/doc/foo/index.html
 
@@ -195,7 +195,7 @@ fn rustdoc_only_bar_dependency() {
         .with_stderr_data(str![[r#"
 [LOCKING] 1 package to latest compatible version
 [DOCUMENTING] bar v0.0.1 ([ROOT]/bar)
-[RUNNING] `rustdoc [..] --crate-name bar [ROOT]/bar/src/lib.rs -o [ROOT]/foo/target/doc [..] --cfg=foo -C metadata=[..] -L dependency=[ROOT]/foo/target/debug/deps [..]`
+[RUNNING] `rustdoc [..] --crate-name bar [ROOT]/bar/src/lib.rs -o [ROOT]/foo/target/doc [..]-C metadata=[..] -L dependency=[ROOT]/foo/target/debug/deps [..]--cfg=foo[..]`
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 [GENERATED] [ROOT]/foo/target/doc/bar/index.html
 
@@ -213,7 +213,7 @@ fn rustdoc_same_name_documents_lib() {
     p.cargo("rustdoc -v -- --cfg=foo")
         .with_stderr_data(str![[r#"
 [DOCUMENTING] foo v0.0.1 ([ROOT]/foo)
-[RUNNING] `rustdoc [..] --crate-name foo src/lib.rs -o [ROOT]/foo/target/doc [..] --cfg=foo -C metadata=[..] -L dependency=[ROOT]/foo/target/debug/deps [..]`
+[RUNNING] `rustdoc [..] --crate-name foo src/lib.rs -o [ROOT]/foo/target/doc [..]-C metadata=[..] -L dependency=[ROOT]/foo/target/debug/deps [..]--cfg=foo[..]`
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 [GENERATED] [ROOT]/foo/target/doc/foo/index.html