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cc: add __func__ support

--- a/sys/src/cmd/cc/c99

+++ b/sys/src/cmd/cc/c99

@@ -18,6 +18,7 @@

 11, 30, 31, 32. restrict, inline

 12. Allow declarations anywhere.

 15. for loop declarations

+23. __func__ identifier

 28. structs ending in incomplete type.

 Unneeded (already had):

@@ -42,5 +43,4 @@

 5. __STDC_IEC_559__, __STDC_IEC_559_COMPLEX__,

 	__STDC_ISO_10646__

 13. Digraph tokens

-23. __func__ identifier

--- a/sys/src/cmd/cc/cc.h

+++ b/sys/src/cmd/cc/cc.h

@@ -583,6 +583,7 @@

 void	edecl(int, Type*, Sym*);

 Type*	fnproto(Node*);

 Type*	fnproto1(Node*);

+void	fndecls(Node*, int);

 void	markdcl(void);

 Type*	paramconv(Type*, int);

 void	pdecl(int, Type*, Sym*);

--- a/sys/src/cmd/cc/cc.y

+++ b/sys/src/cmd/cc/cc.y

@@ -95,11 +95,13 @@

 	pdecl

 	{

 		argmark($2, 1);

+		fndecls($2, 0);

 	}

 	block

 	{

 		Node *n;

+		fndecls($2, 1);

 		n = revertdcl();

 		if(n)

 			$6 = new(OLIST, n, $6);

--- a/sys/src/cmd/cc/dcl.c

+++ b/sys/src/cmd/cc/dcl.c

@@ -732,6 +732,30 @@

 }

 void

+fndecls(Node *f, int pass)

+{

+	static Sym *funcsym;

+	Node *n;

+

+	if(pass == 0){

+		n = new(ONAME, Z, Z);

+		n->type = typ(TARRAY, garbt(types[TCHAR], BCONSTNT));

+		n->type->width = 0;

+		n->sym = slookup("__func__");

+		n->sym->type = n->type;

+		funcsym = dodecl(adecl, CLOCAL, n->type, n)->sym;

+	}else if(funcsym->aused){

+		n = new(OSTRING, Z, Z);

+		n->cstring = f->left->sym->name;

+		n->type = copytyp(funcsym->type);

+		n->type->width = strlen(n->cstring)+1;

+		n->etype = TARRAY;

+		n->class = CSTATIC;

+		doinit(funcsym, funcsym->type, 0L, n);

+	}

+}

+

+void

 markdcl(void)

 {

 	Decl *d;