cmd/dist: add liblink build information

In addition to adding the library, change the way the anames array is created.
Previously, it was written to src/cmd/6l/enam.c (and similarly for 5l and 8l)
and each of the other tools (6g, 6c, 6a) compiled the 6l/enam.c file in addition
to their own sources.

Now that there is a library shared by all these programs, move the anames
array into that library. To eliminate name conflicts, name the array after
the architecture letter: anames5, anames6, anames8.

First step to linker cleanup (golang.org/s/go13linker).

This CL does not build by itself. It depends on the CLs introducing
liblink and changing commands to use it.

R=iant
CC=golang-dev
https://golang.org/cl/35740044

.hgignore

@@ -33,7 +33,7 @@ misc/goplay/goplay
 misc/osx/*.pkg
 misc/osx/*.dmg
 src/cmd/?a/y.output
-src/cmd/?l/enam.c
+src/liblink/anames?.c
 src/cmd/cc/y.output
 src/cmd/cgo/zdefaultcc.go
 src/cmd/dist/dist.dSYM

src/cmd/dist/a.h

@@ -93,7 +93,7 @@ void	cmdversion(int, char**);
 
 // buildgc.c
 void	gcopnames(char*, char*);
-void	mkenam(char*, char*);
+void	mkanames(char*, char*);
 
 // buildruntime.c
 void	mkzasm(char*, char*);

src/cmd/dist/build.c

@@ -493,6 +493,18 @@ static struct {
 		"$GOROOT/include/ureg_arm.h",
 		"$GOROOT/include/ureg_x86.h",
 	}},
+	{"liblink", {
+		"$GOROOT/include/u.h",
+		"$GOROOT/include/utf.h",
+		"$GOROOT/include/fmt.h",
+		"$GOROOT/include/libc.h",
+		"$GOROOT/include/bio.h",
+		"$GOROOT/include/ar.h",
+		"$GOROOT/include/link.h",
+		"anames5.c",
+		"anames6.c",
+		"anames8.c",
+	}},
 	{"cmd/cc", {
 		"-pgen.c",
 		"-pswt.c",
@@ -508,19 +520,16 @@ static struct {
 	{"cmd/5c", {
 		"../cc/pgen.c",
 		"../cc/pswt.c",
-		"../5l/enam.c",
 		"$GOROOT/pkg/obj/$GOOS_$GOARCH/libcc.a",
 	}},
 	{"cmd/6c", {
 		"../cc/pgen.c",
 		"../cc/pswt.c",
-		"../6l/enam.c",
 		"$GOROOT/pkg/obj/$GOOS_$GOARCH/libcc.a",
 	}},
 	{"cmd/8c", {
 		"../cc/pgen.c",
 		"../cc/pswt.c",
-		"../8l/enam.c",
 		"$GOROOT/pkg/obj/$GOOS_$GOARCH/libcc.a",
 	}},
 	{"cmd/5g", {
@@ -529,7 +538,6 @@ static struct {
 		"../gc/plive.c",
 		"../gc/popt.c",
 		"../gc/popt.h",
-		"../5l/enam.c",
 		"$GOROOT/pkg/obj/$GOOS_$GOARCH/libgc.a",
 	}},
 	{"cmd/6g", {
@@ -538,7 +546,6 @@ static struct {
 		"../gc/plive.c",
 		"../gc/popt.c",
 		"../gc/popt.h",
-		"../6l/enam.c",
 		"$GOROOT/pkg/obj/$GOOS_$GOARCH/libgc.a",
 	}},
 	{"cmd/8g", {
@@ -547,25 +554,22 @@ static struct {
 		"../gc/plive.c",
 		"../gc/popt.c",
 		"../gc/popt.h",
-		"../8l/enam.c",
 		"$GOROOT/pkg/obj/$GOOS_$GOARCH/libgc.a",
 	}},
 	{"cmd/5l", {
 		"../ld/*",
-		"enam.c",
 	}},
 	{"cmd/6l", {
 		"../ld/*",
-		"enam.c",
 	}},
 	{"cmd/8l", {
 		"../ld/*",
-		"enam.c",
 	}},
 	{"cmd/go", {
 		"zdefaultcc.go",
 	}},
 	{"cmd/", {
+		"$GOROOT/pkg/obj/$GOOS_$GOARCH/liblink.a",
 		"$GOROOT/pkg/obj/$GOOS_$GOARCH/libmach.a",
 		"$GOROOT/pkg/obj/$GOOS_$GOARCH/libbio.a",
 		"$GOROOT/pkg/obj/$GOOS_$GOARCH/lib9.a",
@@ -596,7 +600,9 @@ static struct {
 	void (*gen)(char*, char*);
 } gentab[] = {
 	{"opnames.h", gcopnames},
-	{"enam.c", mkenam},
+	{"anames5.c", mkanames},
+	{"anames6.c", mkanames},
+	{"anames8.c", mkanames},
 	{"zasm_", mkzasm},
 	{"zdefaultcc.go", mkzdefaultcc},
 	{"zsys_", mkzsys},
@@ -605,6 +611,9 @@ static struct {
 	{"zruntime_defs_", mkzruntimedefs},
 	{"zversion.go", mkzversion},
 	{"zaexperiment.h", mkzexperiment},
+
+	// not generated anymore, but delete the file if we see it
+	{"enam.c", nil},
 };
 
 // install installs the library, package, or binary associated with dir,
@@ -869,6 +878,8 @@ install(char *dir)
 		p = files.p[i];
 		elem = lastelem(p);
 		for(j=0; j<nelem(gentab); j++) {
+			if(gentab[j].gen == nil)
+				continue;
 			if(hasprefix(elem, gentab[j].nameprefix)) {
 				if(vflag > 1)
 					errprintf("generate %s\n", p);
@@ -1247,6 +1258,7 @@ static char *buildorder[] = {
 	"lib9",
 	"libbio",
 	"libmach",
+	"liblink",
 
 	"misc/pprof",
 
@@ -1338,6 +1350,7 @@ static char *cleantab[] = {
 	"lib9",
 	"libbio",
 	"libmach",
+	"liblink",
 	"pkg/bufio",
 	"pkg/bytes",
 	"pkg/container/heap",

src/cmd/dist/buildgc.c

@@ -63,10 +63,10 @@ gcopnames(char *dir, char *file)
 	vfree(&fields);
 }
 
-// mkenam reads [568].out.h and writes enam.c
+// mkanames reads [568].out.h and writes anames[568].c
 // The format is much the same as the Go opcodes above.
 void
-mkenam(char *dir, char *file)
+mkanames(char *dir, char *file)
 {
 	int i, ch;
 	Buf in, b, out;
@@ -78,11 +78,11 @@ mkenam(char *dir, char *file)
 	binit(&out);
 	vinit(&lines);
 
-	ch = dir[xstrlen(dir)-2];
-	bprintf(&b, "%s/../%cl/%c.out.h", dir, ch, ch);
+	ch = file[xstrlen(file)-3];
+	bprintf(&b, "%s/../cmd/%cl/%c.out.h", dir, ch, ch);
 	readfile(&in, bstr(&b));
 	splitlines(&lines, bstr(&in));
-	bwritestr(&out, "char*	anames[] = {\n");
+	bprintf(&out, "char*	anames%c[] = {\n", ch);
 	for(i=0; i<lines.len; i++) {
 		if(hasprefix(lines.p[i], "\tA")) {
 			p = xstrstr(lines.p[i], ",");