Don't use crti.S/crtn.S

They are unnecessary because we use .init_array/.fini_array exclusively.

gcc/gcc/config/riscv/elf.h

@@ -23,9 +23,9 @@ along with GCC; see the file COPYING3.  If not see
 #define LIB_SPEC ""
 
 #undef  STARTFILE_SPEC
-#define STARTFILE_SPEC "crti%O%s crtbegin%O%s"
+#define STARTFILE_SPEC "crt0%O%s crtbegin%O%s"
 
 #undef  ENDFILE_SPEC
-#define ENDFILE_SPEC "crtend%O%s crtn%O%s"
+#define ENDFILE_SPEC "crtend%O%s"
 
 #define NO_IMPLICIT_EXTERN_C 1

gcc/libgcc/config/riscv/crti.S

@@ -1,42 +1 @@
-/* Copyright (C) 2001, 2002 Free Software Foundation, Inc.
-
-This file is part of GCC.
-
-GCC is free software; you can redistribute it and/or modify it under
-the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 3, or (at your option) any later
-version.
-
-GCC is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or
-FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-for more details.
-
-Under Section 7 of GPL version 3, you are granted additional
-permissions described in the GCC Runtime Library Exception, version
-3.1, as published by the Free Software Foundation.
-
-You should have received a copy of the GNU General Public License and
-a copy of the GCC Runtime Library Exception along with this program;
-see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
-<http://www.gnu.org/licenses/>.  */
-
-#ifdef __riscv64
-# define SR sd
-#else
-# define SR sw
-#endif
-
-	.section .init,"ax",@progbits
-	.globl	_init
-	.type	_init,@function
-_init:
-	add	sp, sp, -8
-	SR	ra, 0(sp)
-
-	.section .fini,"ax",@progbits
-	.globl	_fini
-	.type	_fini,@function
-_fini:
-	add	sp, sp, -8
-	SR	ra, 0(sp)
+/* crti.S is empty because .init_array/.fini_array are used exclusively. */

gcc/libgcc/config/riscv/crtn.S

@@ -1,38 +1 @@
-/* Copyright (C) 2001, 2002 Free Software Foundation, Inc.
-
-This file is part of GCC.
-
-GCC is free software; you can redistribute it and/or modify it under
-the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 3, or (at your option) any later
-version.
-
-GCC is distributed in the hope that it will be useful, but WITHOUT ANY
-WARraNTY; without even the implied warranty of MERCHANTABILITY or
-FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-for more details.
-
-Under Section 7 of GPL version 3, you are granted additional
-permissions described in the GCC Runtime Library Exception, version
-3.1, as published by the Free Software Foundation.
-
-You should have received a copy of the GNU General Public License and
-a copy of the GCC Runtime Library Exception along with this program;
-see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
-<http://www.gnu.org/licenses/>.  */
-
-#ifdef __riscv64
-# define LR ld
-#else
-# define LR lw
-#endif
-
-	.section .init,"ax",@progbits
-	LR	ra, 0(sp)
-	addi	sp, sp, 8
-	ret
-
-	.section .fini,"ax",@progbits
-	LR	ra, 0(sp)
-	addi	sp, sp, 8
-	ret
+/* crtn.S is empty because .init_array/.fini_array are used exclusively. */

gcc/libgcc/config/riscv/t-elf

@@ -1,10 +1,2 @@
 # Assemble startup files.
-$(T)crti.o: $(srcdir)/config/riscv/crti.asm $(GCC_PASSES)
-	$(GCC_FOR_TARGET) $(GCC_CFLAGS) $(MULTILIB_CFLAGS) $(INCLUDES) \
-	-c -o $(T)crti.o -x assembler-with-cpp $(srcdir)/config/riscv/crti.asm
-
-$(T)crtn.o: $(srcdir)/config/riscv/crtn.asm $(GCC_PASSES)
-	$(GCC_FOR_TARGET) $(GCC_CFLAGS) $(MULTILIB_CFLAGS) $(INCLUDES) \
-	-c -o $(T)crtn.o -x assembler-with-cpp $(srcdir)/config/riscv/crtn.asm
-
 LIB2ADD += $(srcdir)/config/riscv/riscv-fp.c