sys-libs/libcxx: Use tc-get-c-rtlib

Signed-off-by: Michał Górny <mgorny@gentoo.org>

sys-libs/libcxx/libcxx-13.0.1.ebuild

@@ -89,14 +89,10 @@ multilib_src_configure() {
 		extra_libs+=( -lunwind )
 		# if we're using libunwind and clang with compiler-rt, we want
 		# to link to compiler-rt instead of -lgcc_s
-		if tc-is-clang; then
-			local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
-			   ${LDFLAGS} -print-libgcc-file-name)
-			if [[ ${compiler_rt} == *libclang_rt* ]]; then
-				want_gcc_s=OFF
-				want_compiler_rt=ON
-				extra_libs+=( "${compiler_rt}" )
-			fi
+		if [[ $(tc-get-c-rtlib) == compiler-rt ]]; then
+			want_gcc_s=OFF
+			want_compiler_rt=ON
+			extra_libs+=( "${compiler_rt}" )
 		fi
 	elif [[ ${CHOST} == *-darwin* ]] && tc-is-clang; then
 		# clang-based darwin prefix disables libunwind useflag during

sys-libs/libcxx/libcxx-14.0.6.ebuild

@@ -97,14 +97,10 @@ multilib_src_configure() {
 		extra_libs+=( -lunwind )
 		# if we're using libunwind and clang with compiler-rt, we want
 		# to link to compiler-rt instead of -lgcc_s
-		if tc-is-clang; then
-			local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
-			   ${LDFLAGS} -print-libgcc-file-name)
-			if [[ ${compiler_rt} == *libclang_rt* ]]; then
-				want_gcc_s=OFF
-				want_compiler_rt=ON
-				extra_libs+=( "${compiler_rt}" )
-			fi
+		if [[ $(tc-get-c-rtlib) == compiler-rt ]]; then
+			want_gcc_s=OFF
+			want_compiler_rt=ON
+			extra_libs+=( "${compiler_rt}" )
 		fi
 	elif [[ ${CHOST} == *-darwin* ]] && tc-is-clang; then
 		# clang-based darwin prefix disables libunwind useflag during

sys-libs/libcxx/libcxx-15.0.2.ebuild

@@ -95,15 +95,9 @@ multilib_src_configure() {
 		strip-unsupported-flags
 	fi
 
-	# link against compiler-rt instead of libgcc if this is what clang does
-	local want_compiler_rt=OFF
-	if tc-is-clang; then
-		local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
-			${LDFLAGS} -print-libgcc-file-name)
-		if [[ ${compiler_rt} == *libclang_rt* ]]; then
-			want_compiler_rt=ON
-		fi
-	fi
+	# link to compiler-rt
+	local use_compiler_rt=OFF
+	[[ $(tc-get-c-rtlib) == compiler-rt ]] && use_compiler_rt=ON
 
 	# bootstrap: cmake is unhappy if compiler can't link to stdlib
 	local nolib_flags=( -nodefaultlibs -lc )
@@ -131,7 +125,7 @@ multilib_src_configure() {
 		-DLIBCXX_HAS_MUSL_LIBC=$(usex elibc_musl)
 		-DLIBCXX_INCLUDE_BENCHMARKS=OFF
 		-DLIBCXX_INCLUDE_TESTS=$(usex test)
-		-DLIBCXX_USE_COMPILER_RT=${want_compiler_rt}
+		-DLIBCXX_USE_COMPILER_RT=${use_compiler_rt}
 	)
 
 	if use test; then

sys-libs/libcxx/libcxx-15.0.3.9999.ebuild

@@ -94,15 +94,9 @@ multilib_src_configure() {
 		strip-unsupported-flags
 	fi
 
-	# link against compiler-rt instead of libgcc if this is what clang does
-	local want_compiler_rt=OFF
-	if tc-is-clang; then
-		local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
-			${LDFLAGS} -print-libgcc-file-name)
-		if [[ ${compiler_rt} == *libclang_rt* ]]; then
-			want_compiler_rt=ON
-		fi
-	fi
+	# link to compiler-rt
+	local use_compiler_rt=OFF
+	[[ $(tc-get-c-rtlib) == compiler-rt ]] && use_compiler_rt=ON
 
 	# bootstrap: cmake is unhappy if compiler can't link to stdlib
 	local nolib_flags=( -nodefaultlibs -lc )
@@ -130,7 +124,7 @@ multilib_src_configure() {
 		-DLIBCXX_HAS_MUSL_LIBC=$(usex elibc_musl)
 		-DLIBCXX_INCLUDE_BENCHMARKS=OFF
 		-DLIBCXX_INCLUDE_TESTS=$(usex test)
-		-DLIBCXX_USE_COMPILER_RT=${want_compiler_rt}
+		-DLIBCXX_USE_COMPILER_RT=${use_compiler_rt}
 	)
 
 	if use test; then

sys-libs/libcxx/libcxx-16.0.0.9999.ebuild

@@ -94,15 +94,9 @@ multilib_src_configure() {
 		strip-unsupported-flags
 	fi
 
-	# link against compiler-rt instead of libgcc if this is what clang does
-	local want_compiler_rt=OFF
-	if tc-is-clang; then
-		local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
-			${LDFLAGS} -print-libgcc-file-name)
-		if [[ ${compiler_rt} == *libclang_rt* ]]; then
-			want_compiler_rt=ON
-		fi
-	fi
+	# link to compiler-rt
+	local use_compiler_rt=OFF
+	[[ $(tc-get-c-rtlib) == compiler-rt ]] && use_compiler_rt=ON
 
 	# bootstrap: cmake is unhappy if compiler can't link to stdlib
 	local nolib_flags=( -nodefaultlibs -lc )
@@ -130,7 +124,7 @@ multilib_src_configure() {
 		-DLIBCXX_HAS_MUSL_LIBC=$(usex elibc_musl)
 		-DLIBCXX_INCLUDE_BENCHMARKS=OFF
 		-DLIBCXX_INCLUDE_TESTS=$(usex test)
-		-DLIBCXX_USE_COMPILER_RT=${want_compiler_rt}
+		-DLIBCXX_USE_COMPILER_RT=${use_compiler_rt}
 	)
 
 	if use test; then

sys-libs/libcxx/libcxx-16.0.0_pre20221006.ebuild

@@ -94,15 +94,9 @@ multilib_src_configure() {
 		strip-unsupported-flags
 	fi
 
-	# link against compiler-rt instead of libgcc if this is what clang does
-	local want_compiler_rt=OFF
-	if tc-is-clang; then
-		local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
-			${LDFLAGS} -print-libgcc-file-name)
-		if [[ ${compiler_rt} == *libclang_rt* ]]; then
-			want_compiler_rt=ON
-		fi
-	fi
+	# link to compiler-rt
+	local use_compiler_rt=OFF
+	[[ $(tc-get-c-rtlib) == compiler-rt ]] && use_compiler_rt=ON
 
 	# bootstrap: cmake is unhappy if compiler can't link to stdlib
 	local nolib_flags=( -nodefaultlibs -lc )
@@ -130,7 +124,7 @@ multilib_src_configure() {
 		-DLIBCXX_HAS_MUSL_LIBC=$(usex elibc_musl)
 		-DLIBCXX_INCLUDE_BENCHMARKS=OFF
 		-DLIBCXX_INCLUDE_TESTS=$(usex test)
-		-DLIBCXX_USE_COMPILER_RT=${want_compiler_rt}
+		-DLIBCXX_USE_COMPILER_RT=${use_compiler_rt}
 	)
 
 	if use test; then

sys-libs/libcxx/libcxx-16.0.0_pre20221010.ebuild

@@ -94,15 +94,9 @@ multilib_src_configure() {
 		strip-unsupported-flags
 	fi
 
-	# link against compiler-rt instead of libgcc if this is what clang does
-	local want_compiler_rt=OFF
-	if tc-is-clang; then
-		local compiler_rt=$($(tc-getCC) ${CFLAGS} ${CPPFLAGS} \
-			${LDFLAGS} -print-libgcc-file-name)
-		if [[ ${compiler_rt} == *libclang_rt* ]]; then
-			want_compiler_rt=ON
-		fi
-	fi
+	# link to compiler-rt
+	local use_compiler_rt=OFF
+	[[ $(tc-get-c-rtlib) == compiler-rt ]] && use_compiler_rt=ON
 
 	# bootstrap: cmake is unhappy if compiler can't link to stdlib
 	local nolib_flags=( -nodefaultlibs -lc )
@@ -130,7 +124,7 @@ multilib_src_configure() {
 		-DLIBCXX_HAS_MUSL_LIBC=$(usex elibc_musl)
 		-DLIBCXX_INCLUDE_BENCHMARKS=OFF
 		-DLIBCXX_INCLUDE_TESTS=$(usex test)
-		-DLIBCXX_USE_COMPILER_RT=${want_compiler_rt}
+		-DLIBCXX_USE_COMPILER_RT=${use_compiler_rt}
 	)
 
 	if use test; then