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[ld] Add debugsym()

This function helps to debug the current state of the symbols

--- a/src/cmd/ld/ld.h

+++ b/src/cmd/ld/ld.h

@@ -55,6 +55,7 @@

 extern int moreundef(void);

 extern void listundef(void);

 extern int defasym(struct obj *obj);

+extern int debugsym(void);

 /* globals */

 extern char *filename, *membname;

--- a/src/cmd/ld/symbol.c

+++ b/src/cmd/ld/symbol.c

@@ -144,3 +144,19 @@

 	return 0;

 }

+

+#ifndef NDEBUG

+int

+debugsym(void)

+{

+	Symbol **symp, *sym;

+

+	for (symp = symtab; symp < &symtab[NR_SYMBOL]; symp++) {

+		for (sym = *symp; sym; sym = sym->hash)

+			fprintf(stderr,

+			        "sym: %s (%#x)\n",

+			        sym->name,

+			        sym->value);

+	}

+}

+#endif