eclass/toolchain-funcs: Sync with Gentoo

It's from Gentoo commit c7f5ca73ddfab78834c5bf240cb544e07a6d61ab.

sdk_container/src/third_party/portage-stable/eclass/toolchain-funcs.eclass

@@ -1,4 +1,4 @@
-# Copyright 2002-2023 Gentoo Authors
+# Copyright 2002-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 # @ECLASS: toolchain-funcs.eclass
@@ -251,7 +251,7 @@ tc-detect-is-softfloat() {
 
 	case ${CTARGET:-${CHOST}} in
 		# Avoid autodetection for bare-metal targets. bug #666896
-		*-newlib|*-elf|*-eabi)
+		*-newlib|*-elf|*-eabi|arm64-apple-darwin*)
 			return 1 ;;
 
 		# arm-unknown-linux-gnueabi is ambiguous. We used to treat it as
@@ -295,6 +295,8 @@ tc-tuple-is-softfloat() {
 		# bare-metal targets have their defaults. bug #666896
 		*-newlib|*-elf|*-eabi)
 			echo "no" ;;
+		arm64-apple-darwin*)
+			echo "no" ;;
 		arm*)
 			echo "yes" ;;
 		*)
@@ -626,7 +628,14 @@ tc-has-tls() {
 		-*) die "Usage: tc-has-tls [-c|-l] [toolchain prefix]";;
 	esac
 
-	: "${flags:=-fPIC -shared -Wl,-z,defs}"
+	case "${CHOST}" in
+		*-darwin*)
+			# bug #612370
+			: ${flags:=-dynamiclib}
+			;;
+		*)
+			: ${flags:=-fPIC -shared -Wl,-z,defs}
+	esac
 	[[ $1 == -* ]] && shift
 	$(tc-getCC "$@") ${flags} "${base}.c" -o "${base}" >&/dev/null
 	local ret=$?
@@ -645,6 +654,7 @@ tc-ninja_magic_to_arch() {
 	[[ -z ${host} ]] && host=${CTARGET:-${CHOST}}
 
 	case ${host} in
+		arm64*)		echo arm64;;
 		aarch64*)	echo arm64;;
 		alpha*)		echo alpha;;
 		arc*)		echo arc;;
@@ -1032,6 +1042,7 @@ gen_usr_ldscript() {
 	[[ -z ${ED+set} ]] && local ED=${D%/}${EPREFIX}/
 
 	tc-is-static-only && return
+	use prefix && return
 
 	# We only care about stuffing / for the native ABI, bug #479448
 	if [[ $(type -t multilib_is_native_abi) == "function" ]] ; then
@@ -1234,6 +1245,7 @@ tc-get-build-ptr-size() {
 # @RETURN: Shell true if we are using LTO, shell false otherwise
 tc-is-lto() {
 	local f="${T}/test-lto.o"
+	local ret=1
 
 	case $(tc-get-compiler-type) in
 		clang)
@@ -1241,14 +1253,25 @@ tc-is-lto() {
 			# If LTO is used, clang will output bytecode and llvm-bcanalyzer
 			# will run successfully.  Otherwise, it will output plain object
 			# file and llvm-bcanalyzer will exit with error.
-			llvm-bcanalyzer "${f}" &>/dev/null && return 0
+			llvm-bcanalyzer "${f}" &>/dev/null && ret=0
 			;;
 		gcc)
 			$(tc-getCC) ${CFLAGS} -c -o "${f}" -x c - <<<"" || die
-			[[ $($(tc-getREADELF) -S "${f}") == *.gnu.lto* ]] && return 0
+			[[ $($(tc-getREADELF) -S "${f}") == *.gnu.lto* ]] && ret=0
 			;;
 	esac
-	return 1
+	rm -f "${f}" || die
+	return "${ret}"
+}
+
+# @FUNCTION: tc-has-64bit-time_t
+# @RETURN: Shell true if time_t is at least 64 bits long, false otherwise
+tc-has-64bit-time_t() {
+	$(tc-getCC) ${CFLAGS} ${CPPFLAGS} -c -x c - -o /dev/null <<-EOF &>/dev/null
+		#include <sys/types.h>
+		int test[sizeof(time_t) >= 8 ? 1 : -1];
+	EOF
+	return $?
 }
 
 fi