forsyth: add allexport, though this is not currently wired up to any cmd line option

Reference: /n/atom/patch/applied/6lallexport
Date: Sun Aug 16 03:58:35 CES 2015
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/6l/l.h	Sun Aug 16 03:58:20 2015
+++ /sys/src/cmd/6l/l.h	Sun Aug 16 03:58:21 2015
@@ -339,7 +339,7 @@
 EXTERN	Adr*	reloca;
 EXTERN	int	doexp, dlm;
 EXTERN	int	imports, nimports;
-EXTERN	int	exports, nexports;
+EXTERN	int	exports, nexports, allexport;
 EXTERN	char*	EXPTAB;
 EXTERN	Prog	undefp;
 
@@ -391,9 +391,9 @@
 void	ldobj(int, long, char*);
 void	loadlib(void);
 void	listinit(void);
-Sym*	lookup(char*, int);
 void	llput(vlong v);
 void	llputl(vlong v);
+Sym*	lookup(char*, int);
 void	lput(long);
 void	lputl(long);
 void	main(int, char*[]);
--- /sys/src/cmd/6l/pass.c	Sun Aug 16 03:58:24 2015
+++ /sys/src/cmd/6l/pass.c	Sun Aug 16 03:58:25 2015
@@ -713,14 +713,14 @@
 	n = 0;
 	for(i = 0; i < NHASH; i++)
 		for(s = hash[i]; s != S; s = s->link)
-			if(s->sig != 0 && s->type != SXREF && s->type != SUNDEF && (nexports == 0 || s->subtype == SEXPORT))
+			if(s->type != SXREF && s->type != SUNDEF && (nexports == 0 && s->sig != 0 || s->subtype == SEXPORT || allexport))
 				n++;
 	esyms = malloc(n*sizeof(Sym*));
 	ne = n;
 	n = 0;
 	for(i = 0; i < NHASH; i++)
 		for(s = hash[i]; s != S; s = s->link)
-			if(s->sig != 0 && s->type != SXREF && s->type != SUNDEF && (nexports == 0 || s->subtype == SEXPORT))
+			if(s->type != SXREF && s->type != SUNDEF && (nexports == 0 && s->sig != 0 || s->subtype == SEXPORT || allexport))
 				esyms[n++] = s;
 	for(i = 0; i < ne-1; i++)
 		for(j = i+1; j < ne; j++)