Support the N_PEXT bit of the Mach-O object format....

third_party/yasm/patches/03_macho_objfmt_private.patch

Index: third_party/yasm/patches/03_macho_objfmt_private.patch
===================================================================
--- third_party/yasm/patches/03_macho_objfmt_private.patch	(revision 0)
+++ third_party/yasm/patches/03_macho_objfmt_private.patch	(revision 0)
@@ -0,0 +1,32 @@
+Index: modules/objfmts/macho/macho-objfmt.c
+===================================================================
+--- modules/objfmts/macho/macho-objfmt.c	(revision 73577)
++++ modules/objfmts/macho/macho-objfmt.c	(working copy)
+@@ -922,7 +922,26 @@
+             }
+             /*printf("common symbol %s val %lu\n", name, yasm_intnum_get_uint(val));*/
+         } else if (vis & YASM_SYM_GLOBAL) {
+-            n_type |= N_EXT;
++            yasm_valparamhead *valparams =
++                yasm_symrec_get_objext_valparams(sym);
++
++            struct macho_global_data {
++                unsigned long flag; /* N_PEXT */
++            } data;
++
++            data.flag = 0;
++
++            if (valparams) {
++                static const yasm_dir_help help[] = {
++                    { "private_extern", 0, yasm_dir_helper_flag_set,
++                      offsetof(struct macho_global_data, flag), N_PEXT },
++                };
++                yasm_dir_helper(sym, yasm_vps_first(valparams),
++                                yasm_symrec_get_decl_line(sym), help, NELEMS(help),
++                                &data, yasm_dir_helper_valparam_warn);
++            }
++
++            n_type |= N_EXT | data.flag;
+         }
+ 
+         localbuf = info->buf;