dev-lang/rust: provide more neutral default-linker

... otherwise CC at the time of building dev-lang/rust is baked in,
which is problematic if e.g. CC=clang-19 is used and then it gets
depcleaned later (as reported on the gentoo-user ML).

Signed-off-by: Sam James <sam@gentoo.org>

dev-lang/rust/rust-1.71.1-r101.ebuild

@@ -333,7 +333,7 @@ src_configure() {
 		debuginfo-level-tests = 0
 		backtrace = true
 		incremental = false
-		default-linker = "$(tc-getCC)"
+		default-linker = "${CHOST}-cc"
 		parallel-compiler = $(toml_usex parallel-compiler)
 		channel = "$(usex nightly nightly stable)"
 		description = "gentoo"

dev-lang/rust/rust-1.74.1-r101.ebuild

@@ -399,7 +399,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		parallel-compiler = $(toml_usex parallel-compiler)
 		channel = "$(usex nightly nightly stable)"

dev-lang/rust/rust-1.75.0-r101.ebuild

@@ -365,7 +365,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		parallel-compiler = $(toml_usex parallel-compiler)
 		channel = "$(usex nightly nightly stable)"

dev-lang/rust/rust-1.76.0-r101.ebuild

@@ -364,7 +364,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		parallel-compiler = $(toml_usex parallel-compiler)
 		channel = "$(usex nightly nightly stable)"

dev-lang/rust/rust-1.77.1-r101.ebuild

@@ -363,7 +363,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		parallel-compiler = $(toml_usex parallel-compiler)
 		channel = "$(usex nightly nightly stable)"

dev-lang/rust/rust-1.78.0-r101.ebuild

@@ -362,7 +362,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		parallel-compiler = $(toml_usex parallel-compiler)
 		channel = "$(usex nightly nightly stable)"

dev-lang/rust/rust-1.79.0-r101.ebuild

@@ -362,7 +362,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		parallel-compiler = $(toml_usex parallel-compiler)
 		channel = "$(usex nightly nightly stable)"

dev-lang/rust/rust-1.80.1-r101.ebuild

@@ -361,7 +361,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		parallel-compiler = $(toml_usex parallel-compiler)
 		channel = "$(usex nightly nightly stable)"

dev-lang/rust/rust-1.81.0-r101.ebuild

@@ -365,7 +365,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		parallel-compiler = $(toml_usex parallel-compiler)
 		channel = "$(usex nightly nightly stable)"

dev-lang/rust/rust-1.82.0-r102.ebuild

@@ -373,7 +373,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		parallel-compiler = $(toml_usex parallel-compiler)
 		channel = "$(usex nightly nightly stable)"

dev-lang/rust/rust-1.83.0-r2.ebuild

@@ -373,7 +373,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		parallel-compiler = $(toml_usex parallel-compiler)
 		channel = "$(usex nightly nightly stable)"

dev-lang/rust/rust-1.84.0-r1.ebuild

@@ -374,7 +374,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		parallel-compiler = $(toml_usex parallel-compiler)
 		channel = "$(usex nightly nightly stable)"

dev-lang/rust/rust-1.84.1-r1.ebuild

@@ -374,7 +374,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		parallel-compiler = $(toml_usex parallel-compiler)
 		channel = "$(usex nightly nightly stable)"

dev-lang/rust/rust-1.85.0-r1.ebuild

@@ -462,7 +462,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		channel = "${build_channel}"
 		description = "gentoo"

dev-lang/rust/rust-1.85.0.ebuild

@@ -461,7 +461,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		channel = "${build_channel}"
 		description = "gentoo"

dev-lang/rust/rust-1.85.1.ebuild

@@ -462,7 +462,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		channel = "${build_channel}"
 		description = "gentoo"

dev-lang/rust/rust-1.86.0_beta20250218-r1.ebuild

@@ -469,7 +469,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		channel = "${build_channel}"
 		description = "gentoo"

dev-lang/rust/rust-1.86.0_beta20250225.ebuild

@@ -469,7 +469,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		channel = "${build_channel}"
 		description = "gentoo"

dev-lang/rust/rust-9999.ebuild

@@ -462,7 +462,7 @@ src_configure() {
 		backtrace = true
 		incremental = false
 		$(if ! tc-is-cross-compiler; then
-			echo "default-linker = \"$(tc-getCC)\""
+			echo "default-linker = \"${CHOST}-cc\""
 		fi)
 		channel = "${build_channel}"
 		description = "gentoo"