RISC-V: Generalize -march support, add ELF attribute support.

	Kito Cheng  <kito.cheng@gmail.com>
	Monk Chiang  <sh.chiang04@gmail.com>

	gcc/
	* common/config/riscv/riscv-common.c: Include sstream.
	(riscv_subset_list::to_string): New.
	(riscv_arch_str): Likewise.
	* config.gcc (riscv*-*-*): Handle --with-riscv-attribute=
	* config.in: Regen.
	* config/riscv/riscv-protos.h (riscv_arch_str): New.
	* config/riscv/riscv.c (INCLUDE_STRING): Defined.
	(riscv_emit_attribute): New.
	(riscv_file_start): Emit attribute if needed.
	(riscv_option_override): Init riscv_emit_attribute_p.
	* config/riscv/riscv.opt (mriscv-attribute): New option.
	* configure.ac (riscv*-*-*): Check binutils is supporting ELF
	* configure: Regen.
	* doc/install.texi: Document --with-riscv-attribute.
	* doc/invoke.texi: Document -mriscv-attribute.

	* common/config/riscv/riscv-common.c:
	Include config/riscv/riscv-protos.h.
	(INCLUDE_STRING): Defined.
	(RISCV_DONT_CARE_VERSION): Defined.
	(riscv_subset_t): Declare.
	(riscv_subset_t::riscv_subset_t): New.
	(riscv_subset_list): Declare.
	(riscv_subset_list::riscv_subset_list): New.
	(riscv_subset_list::~riscv_subset_list): Likewise.
	(riscv_subset_list::parsing_subset_version): Likewise.
	(riscv_subset_list::parse_std_ext): Likewise.
	(riscv_subset_list::parse_sv_or_non_std_ext): Likewise.
	(riscv_subset_list::add): Likewise.
	(riscv_subset_list::lookup): Likewise.
	(riscv_subset_list::xlen): Likewise.
	(riscv_subset_list::parse): Likewise.
	(riscv_supported_std_ext): Likewise.
	(current_subset_list): Likewise.
	(riscv_parse_arch_string): Using riscv_subset_list::parse to
	parse.

	gcc/testsuite/
	* gcc.target/riscv/attribute-1.c: New.
	* gcc.target/riscv/attribute-2.c: Likewise.
	* gcc.target/riscv/attribute-3.c: Likewise.
	* gcc.target/riscv/attribute-4.c: Likewise.
	* gcc.target/riscv/attribute-5.c: Likewise.
	* gcc.target/riscv/attribute-6.c: Likewise.
	* gcc.target/riscv/attribute-7.c: Likewise.
	* gcc.target/riscv/attribute-8.c: Likewise.
	* gcc.target/riscv/attribute-9.c: Likewise.

	* gcc.target/riscv/arch-1.c: New.
	* gcc.target/riscv/arch-2.c: Likewise.
	* gcc.target/riscv/arch-3.c: Likewise.
	* gcc.target/riscv/arch-4.c: Likewise.

Co-Authored-By: Monk Chiang <sh.chiang04@gmail.com>

From-SVN: r269337

1 files changed, 25 insertions, 1 deletions

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 3ee31c5..3eb2e80 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -4211,7 +4211,7 @@ case "${target}" in
 		;;
 
 	riscv*-*-*)
-		supported_defaults="abi arch tune"
+		supported_defaults="abi arch tune riscv_attribute"
 
 		case "${target}" in
 		riscv-* | riscv32*) xlen=32 ;;
@@ -4219,6 +4219,30 @@ case "${target}" in
 		*) echo "Unsupported RISC-V target ${target}" 1>&2; exit 1 ;;
 		esac
 
+		case "${with_riscv_attribute}" in
+		yes)
+			tm_defines="${tm_defines} TARGET_RISCV_ATTRIBUTE=1"
+			;;
+		no)
+			tm_defines="${tm_defines} TARGET_RISCV_ATTRIBUTE=0"
+			;;
+		""|default)
+			case "${target}" in
+			riscv*-*-elf*)
+				tm_defines="${tm_defines} TARGET_RISCV_ATTRIBUTE=1"
+				;;
+			*)
+				tm_defines="${tm_defines} TARGET_RISCV_ATTRIBUTE=0"
+				;;
+			esac
+			;;
+		*)
+			echo "--with-riscv-attribute=${with_riscv_attribute} is not supported.  The argument must begin with yes, no or default." 1>&2
+			exit 1
+			;;
+		esac
+
+
 		# Infer arch from --with-arch, --target, and --with-abi.
 		case "${with_arch}" in
 		rv32e* | rv32i* | rv32g* | rv64i* | rv64g*)