fix a long standing problem with cabs*() fixes up on netbsd

netbsd has the cabs(3), cabsf(3), and cabsl(3) functions renamed with
__c99_ prefixes on them, and may not all be present with the old names.

there's code in netbsd.cc to fix up these names, but it's only invoked
by a some of our target CPUs -- x86, vax, and arm64, but the rest fail.

the problem is that config/netbsd.h defines SUBTARGET_INIT_BUILTINS to
a function that does this fix up, but this define it only consumed inside
the TARGET_INIT_BUILTINS's macro function if defined.  looks like due to
the supported users of SUBTARGET_INIT_BUILTINS currently, it was added
for darwin support, and nothing else.

add calls to SUBTARGET_INIT_BUILTINS if defined to each of the alpha, arm,
ia64, m68k, mips, pa, riscv, sh, and sparc ports.

tested on sparc64 (where "cabsl" is missing entirely), mips64, and amd64.

this goes all the back to at leastnetbsd-9 (GCC 7), netbsd-10 (GCC 10),
and netbsd-11 (GCC 12).

XXX: pullup-*
XXX: copy into gcc.old, too (still haven't switched alpha, sh3 or m68k.)

Author: mrgtwentythree

external/gpl3/gcc/dist/gcc/config/alpha/alpha.cc

@@ -6588,6 +6588,10 @@ alpha_builtin_function (const char *name, tree ftype,
     TREE_NOTHROW (decl) = 1;
 
   alpha_builtins [(int) code] = decl;
+
+#ifdef SUBTARGET_INIT_BUILTINS
+  SUBTARGET_INIT_BUILTINS;
+#endif
 }
 
 /* Helper function of alpha_init_builtins.  Add the COUNT built-in

external/gpl3/gcc/dist/gcc/config/arm/arm-builtins.cc

@@ -2709,6 +2709,10 @@ arm_init_builtins (void)
 					    ftype_cmse_nonsecure_caller,
 					    ARM_BUILTIN_CMSE_NONSECURE_CALLER);
     }
+
+#ifdef SUBTARGET_INIT_BUILTINS
+  SUBTARGET_INIT_BUILTINS;
+#endif
 }
 
 /* Implement TARGET_BUILTIN_DECL for general builtins.  */

external/gpl3/gcc/dist/gcc/config/ia64/ia64.cc

@@ -10569,6 +10569,10 @@ ia64_init_builtins (void)
       if ((decl = builtin_decl_explicit (BUILT_IN_FINITEL)) != NULL_TREE)
 	set_user_assembler_name (decl, "_Isfinitef128");
     }
+
+#ifdef SUBTARGET_INIT_BUILTINS
+  SUBTARGET_INIT_BUILTINS;
+#endif
 }
 
 static tree

external/gpl3/gcc/dist/gcc/config/m68k/netbsd-elf.h

@@ -53,6 +53,8 @@ along with GCC; see the file COPYING3.  If not see
       } \
   }
 
+/* GCC m68k has no TARGET_INIT_BUILTINS, so simply use it.  */
+#define TARGET_INIT_BUILTINS SUBTARGET_INIT_BUILTINS
 
 /* Provide a CPP_SPEC appropriate for NetBSD m68k targets.  Currently we
    deal with the GCC option '-posix', as well as an indication as to

external/gpl3/gcc/dist/gcc/config/mips/mips.cc

@@ -17023,6 +17023,10 @@ mips_init_builtins (void)
 	  mips_get_builtin_decl_index[d->icode] = i;
 	}
     }
+
+#ifdef SUBTARGET_INIT_BUILTINS
+  SUBTARGET_INIT_BUILTINS;
+#endif
 }
 
 /* Implement TARGET_BUILTIN_DECL.  */

external/gpl3/gcc/dist/gcc/config/pa/pa.cc

@@ -710,6 +710,10 @@ pa_init_builtins (void)
                                    NULL, NULL_TREE);
       pa_builtins[PA_BUILTIN_HUGE_VALQ] = decl;
     }
+
+#ifdef SUBTARGET_INIT_BUILTINS
+  SUBTARGET_INIT_BUILTINS;
+#endif
 }
 
 /* Implement TARGET_BUILTIN_DECL.  */

external/gpl3/gcc/dist/gcc/config/riscv/riscv-builtins.cc

@@ -297,6 +297,10 @@ riscv_init_builtins (void)
 	  riscv_builtin_decl_index[d->icode] = i;
 	}
     }
+
+#ifdef SUBTARGET_INIT_BUILTINS
+  SUBTARGET_INIT_BUILTINS;
+#endif
 }
 
 /* Implement TARGET_BUILTIN_DECL.  */

external/gpl3/gcc/dist/gcc/config/sh/sh.cc

@@ -10317,6 +10317,10 @@ sh_init_builtins (void)
       else if (d->icode == CODE_FOR_set_fpscr)
 	sh_builtin_set_fpscr = d->fndecl;
     }
+
+#ifdef SUBTARGET_INIT_BUILTINS
+  SUBTARGET_INIT_BUILTINS;
+#endif
 }
 
 /* Implement TARGET_ATOMIC_ASSIGN_EXPAND_FENV.  */

external/gpl3/gcc/dist/gcc/config/sparc/sparc.cc

@@ -11086,6 +11086,10 @@ sparc_init_builtins (void)
 
   if (TARGET_VIS)
     sparc_vis_init_builtins ();
+
+#ifdef SUBTARGET_INIT_BUILTINS
+  SUBTARGET_INIT_BUILTINS;
+#endif
 }
 
 /* Create builtin functions for FPU instructions.  */