ld: drop rpath

Was required by old cgo but we don't
generate stub .so files anymore.

Update #1527.

R=iant
CC=golang-dev
https://golang.org/cl/4168056

src/cmd/5l/obj.c

@@ -41,7 +41,6 @@
 #endif
 
 char	*noname		= "<none>";
-char	thechar		= '5';
 char	*thestring 	= "arm";
 
 /*
@@ -133,8 +132,6 @@ main(int argc, char *argv[])
 		usage();
 
 	libinit();
-	if(rpath == nil)
-		rpath = smprint("%s/pkg/%s_%s", goroot, goos, goarch);
 
 	if(!debug['9'] && !debug['U'] && !debug['B'])
 		debug[DEFAULT] = 1;
@@ -265,6 +262,7 @@ main(int argc, char *argv[])
 	follow();
 	softfloat();
 	noops();
+	dostkcheck();
 	span();
 	pclntab();
 	symtab();

src/cmd/6l/obj.c

@@ -40,7 +40,6 @@
 #include	<ar.h>
 
 char	*noname		= "<none>";
-char	thechar		= '6';
 char*	thestring 	= "amd64";
 char*	paramspace	= "FP";
 
@@ -123,8 +122,6 @@ main(int argc, char *argv[])
 		usage();
 
 	libinit();
-	if(rpath == nil)
-		rpath = smprint("%s/pkg/%s_%s", goroot, goos, goarch);
 
 	if(HEADTYPE == -1) {
 		HEADTYPE = 2;
@@ -255,6 +252,7 @@ main(int argc, char *argv[])
 	if(HEADTYPE == 6)
 		domacho();
 	dostkoff();
+	dostkcheck();
 	paramspace = "SP";	/* (FP) now (SP) on output */
 	if(debug['p'])
 		if(debug['1'])

src/cmd/8l/obj.c

@@ -44,7 +44,6 @@
 #endif
 
 char	*noname		= "<none>";
-char	thechar		= '8';
 char	*thestring 	= "386";
 
 /*
@@ -161,8 +160,6 @@ main(int argc, char *argv[])
 	}
 
 	libinit();
-	if(rpath == nil)
-		rpath = smprint("%s/pkg/%s_%s", goroot, goos, goarch);
 
 	switch(HEADTYPE) {
 	default:

src/cmd/ld/macho.c

@@ -276,7 +276,6 @@ asmbmacho(void)
 	vlong v, w;
 	vlong va;
 	int a, i;
-	char *pkgroot;
 	MachoHdr *mh;
 	MachoSect *msect;
 	MachoSeg *ms;
@@ -428,12 +427,6 @@ asmbmacho(void)
 		ml->data[0] = 12;	/* offset to string */
 		strcpy((char*)&ml->data[1], "/usr/lib/dyld");
 
-		if(ndylib > 0) {	/* add reference to where .so files are installed */
-			pkgroot = smprint("%s/pkg/%s_%s", goroot, goos, goarch);
-			ml = newMachoLoad(0x80000000 | 0x1c, 1+(strlen(pkgroot)+1+7)/8*2);	/* LC_RPATH */
-			ml->data[0] = 12;	/* offset of string from beginning of load */
-			strcpy((char*)&ml->data[1], pkgroot);
-		}
 		for(i=0; i<ndylib; i++) {
 			ml = newMachoLoad(12, 4+(strlen(dylib[i])+1+7)/8*2);	/* LC_LOAD_DYLIB */
 			ml->data[0] = 24;	/* offset of string from beginning of load */