build: do not use the host's libbio on Plan 9

R=jas, lucio.dere, rsc
CC=golang-dev
https://golang.org/cl/14604047

include/bio.h

@@ -33,8 +33,6 @@ extern "C" {
 AUTOLIB(bio)
 #endif
 
-#include <fcntl.h>	/* for O_RDONLY, O_WRONLY */
-
 typedef	struct	Biobuf	Biobuf;
 
 enum

include/plan9/bio.h

+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "../bio.h"
+
+#define fmtcharstod charstod
+#define lseek seek

src/cmd/dist/build.c

@@ -626,7 +626,7 @@ install(char *dir)
 	Buf b, b1, path;
 	Vec compile, files, link, go, missing, clean, lib, extra;
 	Time ttarg, t;
-	int i, j, k, n, doclean, targ, usecpp;
+	int i, j, k, n, doclean, targ;
 
 	if(vflag) {
 		if(!streq(goos, gohostos) || !streq(goarch, gohostarch))
@@ -778,8 +778,6 @@ install(char *dir)
 				bsubst(&b1, "$GOARCH", goarch);
 				p = bstr(&b1);
 				if(hassuffix(p, ".a")) {
-					if(streq(gohostos, "plan9") && hassuffix(p, "libbio.a"))
-						continue;
 					vadd(&lib, bpathf(&b, "%s", p));
 					continue;
 				}
@@ -933,20 +931,6 @@ install(char *dir)
 		goto nobuild;
 	}
 
-	// The files generated by GNU Bison use macros that aren't
-	// supported by the Plan 9 compilers so we have to use the
-	// external preprocessor when compiling.
-	usecpp = 0;
-	if(streq(gohostos, "plan9")) {
-		for(i=0; i<files.len; i++) {
-			p = files.p[i];
-			if(hassuffix(p, "y.tab.c") || hassuffix(p, "y.tab.h")){
-				usecpp = 1;
-				break;
-			}
-		}
-	}
-
 	// Compile the files.
 	for(i=0; i<files.len; i++) {
 		if(!hassuffix(files.p[i], ".c") && !hassuffix(files.p[i], ".s"))
@@ -958,13 +942,12 @@ install(char *dir)
 			// C library or tool.
 			if(streq(gohostos, "plan9")) {
 				vadd(&compile, bprintf(&b, "%sc", gohostchar));
-				vadd(&compile, "-FTVw");
-				if(usecpp)
-					vadd(&compile, "-Bp+");
+				vadd(&compile, "-FTVwp");
+				vadd(&compile, "-DPLAN9");
+				vadd(&compile, "-D__STDC__=1");
+				vadd(&compile, "-D__SIZE_TYPE__=ulong"); // for GNU Bison
 				vadd(&compile, bpathf(&b, "-I%s/include/plan9", goroot));
 				vadd(&compile, bpathf(&b, "-I%s/include/plan9/%s", goroot, gohostarch));
-				// Work around Plan 9 C compiler's handling of #include with .. path.
-				vadd(&compile, bpathf(&b, "-I%s/src/cmd/ld", goroot));
 			} else {
 				vcopy(&compile, gccargs.p, gccargs.len);
 				vadd(&compile, "-c");
@@ -1167,8 +1150,6 @@ shouldbuild(char *file, char *dir)
 			if(!contains(name, "plan9"))
 				return 0;
 		}
-		if(streq(dir, "libbio"))
-			return 0;
 	}
 	
 	// Check file name for GOOS or GOARCH.

src/libbio/bgetrune.c

@@ -26,7 +26,6 @@ THE SOFTWARE.
 #include	<u.h>
 #include	<libc.h>
 #include	<bio.h>
-#include	<utf.h>
 
 long
 Bgetrune(Biobuf *bp)

src/libbio/bprint.c

@@ -67,7 +67,9 @@ Bvprint(Biobuf *bp, char *fmt, va_list arg)
 	Fmt f;
 	
 	memset(&f, 0, sizeof f);
+#ifndef PLAN9
 	fmtlocaleinit(&f, nil, nil, nil);
+#endif
 	f.stop = bp->ebuf;
 	f.to = (char*)f.stop + bp->ocount;
 	f.flush = bflush;

src/libbio/bputrune.c

@@ -26,7 +26,6 @@ THE SOFTWARE.
 #include	<u.h>
 #include	<libc.h>
 #include	<bio.h>
-#include	<utf.h>
 
 int
 Bputrune(Biobuf *bp, long c)

src/libbio/bseek.c

@@ -33,7 +33,7 @@ Bseek(Biobuf *bp, vlong offset, int base)
 	vlong n, d;
 	int bufsz;
 
-#ifndef _WIN32
+#if !defined(_WIN32) && !defined(PLAN9)
 	if(sizeof(offset) != sizeof(off_t)) {
 		fprint(2, "Bseek: libbio compiled with %d-byte offset\n", sizeof(off_t));
 		abort();