cmd/ld: replace -hostobj with -linkmode

Still disabled. Need to fix TLS.

R=golang-dev, minux.ma, bradfitz
CC=golang-dev
https://golang.org/cl/7783044

4 files changed, 33 insertions, 19 deletions

diff --git a/src/cmd/ld/data.c b/src/cmd/ld/data.c
index fdf4d043d5..b70d4636cc 100644
--- a/src/cmd/ld/data.c
+++ b/src/cmd/ld/data.c
@@ -178,11 +178,11 @@ relocsym(Sym *s)
 		switch(r->type) {
 		default:
 			o = 0;
-			if(isobj || archreloc(r, s, &o) < 0)
+			if(linkmode == LinkExternal || archreloc(r, s, &o) < 0)
 				diag("unknown reloc %d", r->type);
 			break;
 		case D_ADDR:
-			if(isobj && r->sym->type != SCONST) {
+			if(linkmode == LinkExternal && r->sym->type != SCONST) {
 				r->done = 0;
 
 				// set up addend for eventual relocation via outer symbol.
@@ -212,7 +212,7 @@ relocsym(Sym *s)
 			break;
 		case D_PCREL:
 			// r->sym can be null when CALL $(constant) is transformed from absolute PC to relative PC call.
-			if(isobj && r->sym && r->sym->type != SCONST && r->sym->sect != cursym->sect) {
+			if(linkmode == LinkExternal && r->sym && r->sym->type != SCONST && r->sym->sect != cursym->sect) {
 				r->done = 0;
 
 				// set up addend for eventual relocation via outer symbol.
@@ -630,7 +630,7 @@ datblk(int32 addr, int32 size)
 			Bprint(&bso, " %.2ux", 0);
 		Bprint(&bso, "\n");
 		
-		if(isobj) {
+		if(linkmode == LinkExternal) {
 			for(i=0; i<sym->nr; i++) {
 				r = &sym->r[i];
 				rsname = "";
diff --git a/src/cmd/ld/elf.c b/src/cmd/ld/elf.c
index 50711a0ec1..f5cce9c524 100644
--- a/src/cmd/ld/elf.c
+++ b/src/cmd/ld/elf.c
@@ -758,7 +758,7 @@ elfshbits(Section *sect)
 		sh->flags |= SHF_EXECINSTR;
 	if(sect->rwx & 2)
 		sh->flags |= SHF_WRITE;
-	if(!isobj)
+	if(linkmode != LinkExternal)
 		sh->addr = sect->vaddr;
 	sh->addralign = sect->align;
 	sh->size = sect->len;
@@ -899,7 +899,7 @@ doelf(void)
 	addstring(shstrtab, ".gosymtab");
 	addstring(shstrtab, ".gopclntab");
 	
-	if(isobj) {
+	if(linkmode == LinkExternal) {
 		debug['s'] = 0;
 		debug['d'] = 1;
 
@@ -1131,7 +1131,7 @@ asmbelf(vlong symo)
 	resoff = ELFRESERVE;
 	
 	pph = nil;
-	if(isobj) {
+	if(linkmode == LinkExternal) {
 		/* skip program headers */
 		eh->phoff = 0;
 		eh->phentsize = 0;
@@ -1392,7 +1392,7 @@ elfobj:
 	for(sect=segdata.sect; sect!=nil; sect=sect->next)
 		elfshbits(sect);
 
-	if(isobj) {
+	if(linkmode == LinkExternal) {
 		for(sect=segtext.sect; sect!=nil; sect=sect->next)
 			elfshreloc(sect);
 		for(sect=segdata.sect; sect!=nil; sect=sect->next)
@@ -1415,8 +1415,8 @@ elfobj:
 		sh->size = elfstrsize;
 		sh->addralign = 1;
 
-		// TODO(rsc): Enable for isobj too, once we know it works.
-		if(!isobj)
+		// TODO(rsc): Enable for linkmode == LinkExternal too, once we know it works.
+		if(linkmode != LinkExternal)
 			dwarfaddelfheaders();
 	}
 
@@ -1440,12 +1440,12 @@ elfobj:
 
 	if(flag_shared)
 		eh->type = ET_DYN;
-	else if(isobj)
+	else if(linkmode == LinkExternal)
 		eh->type = ET_REL;
 	else
 		eh->type = ET_EXEC;
 
-	if(!isobj)
+	if(linkmode != LinkExternal)
 		eh->entry = entryvalue();
 
 	eh->version = EV_CURRENT;
@@ -1462,7 +1462,7 @@ elfobj:
 	a += elfwriteshdrs();
 	if(!debug['d'])
 		a += elfwriteinterp();
-	if(!isobj) {
+	if(linkmode != LinkExternal) {
 		if(HEADTYPE == Hnetbsd)
 			a += elfwritenetbsdsig();
 		if(HEADTYPE == Hopenbsd)
diff --git a/src/cmd/ld/go.c b/src/cmd/ld/go.c
index ff1f5f437b..f933cbba34 100644
--- a/src/cmd/ld/go.c
+++ b/src/cmd/ld/go.c
@@ -476,12 +476,10 @@ loadcgo(char *file, char *pkg, char *p, int n)
 		if(strcmp(f[0], "cgo_import_static") == 0) {
 			if(nf != 2)
 				goto err;
-			if(isobj) {
-				local = f[1];
-				s = lookup(local, 0);
-				s->type = SHOSTOBJ;
-				s->size = 0;
-			}
+			local = f[1];
+			s = lookup(local, 0);
+			s->type = SHOSTOBJ;
+			s->size = 0;
 			continue;
 		}
 
@@ -925,3 +923,18 @@ importcycles(void)
 	for(p=pkgall; p; p=p->all)
 		cycle(p);
 }
+
+void
+setlinkmode(char *arg)
+{
+	if(strcmp(arg, "internal") == 0)
+		linkmode = LinkInternal;
+	else if(strcmp(arg, "external") == 0)
+		linkmode = LinkExternal;
+	else if(strcmp(arg, "auto") == 0)
+		linkmode = LinkAuto;
+	else {
+		fprint(2, "unknown link mode -linkmode %s\n", arg);
+		errorexit();
+	}
+}
diff --git a/src/cmd/ld/lib.h b/src/cmd/ld/lib.h
index e5dcdc353c..78232c0759 100644
--- a/src/cmd/ld/lib.h
+++ b/src/cmd/ld/lib.h
@@ -170,6 +170,7 @@ EXTERN	Segment	segtext;
 EXTERN	Segment	segdata;
 EXTERN	Segment	segdwarf;
 
+void	setlinkmode(char*);
 void	addlib(char *src, char *obj);
 void	addlibpath(char *srcref, char *objref, char *file, char *pkg);
 Section*	addsection(Segment*, char*, int);