From 0c3a93ceb7e2167104cdc4a34ed62e7d9e39ce8c Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Tue, 16 Mar 2010 23:10:33 -0700
Subject: [PATCH] runtime: add GOROOT and Version

R=r
CC=golang-dev
https://golang.org/cl/608041
---
 .hgignore                   |  6 +++++-
 src/pkg/runtime/Makefile    |  9 ++++++++-
 src/pkg/runtime/extern.go   | 20 ++++++++++++++++++++
 src/pkg/runtime/mkversion.c | 15 +++++++++++++++
 src/pkg/runtime/runtime.c   |  9 +++++++++
 5 files changed, 57 insertions(+), 2 deletions(-)
 create mode 100644 src/pkg/runtime/mkversion.c

diff --git a/.hgignore b/.hgignore
index 323c81e81de..0ac82faaa8e 100644
--- a/.hgignore
+++ b/.hgignore
@@ -26,9 +26,13 @@ src/cmd/gc/yerr.h
 src/pkg/Make.deps
 src/pkg/exp/ogle/ogle
 src/pkg/os/signal/unix.go
-src/pkg/runtime/cgo2c
 src/pkg/runtime/*/asm.h
+src/pkg/runtime/cgo2c
+src/pkg/runtime/mkversion
 src/pkg/runtime/runtime.acid.*
+src/pkg/runtime/version.go
+src/pkg/github.com/
+src/pkg/*.googlecode.com/
 test/pass.out
 test/run.out
 test/times.out
diff --git a/src/pkg/runtime/Makefile b/src/pkg/runtime/Makefile
index bc8a2d8bfa2..f44de25d41a 100644
--- a/src/pkg/runtime/Makefile
+++ b/src/pkg/runtime/Makefile
@@ -23,6 +23,7 @@ CFLAGS=-I$(GOOS) -I$(GOOS)/$(GOARCH) -wF $(CFLAGS_$(SIZE)) $(CFLAGS_$(GOARCH)) $
 GOFILES=\
 	extern.go\
 	type.go\
+	version.go\
 
 GOFILES_pchw=\
 	pchw/io.go\
@@ -111,7 +112,7 @@ $(pkgdir)/%.h: %.h
 clean: clean-local
 
 clean-local:
-	rm -f cgo2c */asm.h runtime.acid.*
+	rm -f cgo2c mkversion version.go */asm.h runtime.acid.*
 
 $(GOARCH)/asm.h: mkasmh.sh runtime.acid.$(GOARCH)
 	./mkasmh.sh >$@.x
@@ -120,6 +121,12 @@ $(GOARCH)/asm.h: mkasmh.sh runtime.acid.$(GOARCH)
 cgo2c: cgo2c.c
 	$(QUOTED_GOBIN)/quietgcc -o $@ $<
 
+mkversion: mkversion.c
+	$(QUOTED_GOBIN)/quietgcc -o $@ -I "$(GOROOT)/include" $< "$(GOROOT)/lib/lib9.a"
+
+version.go: mkversion
+	mkversion >version.go
+
 %.c:	%.cgo cgo2c
 	./cgo2c $< > $@.tmp
 	mv -f $@.tmp $@
diff --git a/src/pkg/runtime/extern.go b/src/pkg/runtime/extern.go
index f34bb2256cd..b4d903c30c9 100644
--- a/src/pkg/runtime/extern.go
+++ b/src/pkg/runtime/extern.go
@@ -150,3 +150,23 @@ func GC()
 // TODO(rsc): allow f to have (ignored) return values
 //
 func SetFinalizer(x, f interface{})
+
+func getgoroot() string
+
+// GOROOT returns the root of the Go tree.
+// It uses the GOROOT environment variable, if set,
+// or else the root used during the Go build.
+func GOROOT() string {
+	s := getgoroot()
+	if s != "" {
+		return s
+	}
+	return defaultGoroot
+}
+
+// Version returns the Go tree's version string.
+// It is either a sequence number or, when possible,
+// a release tag like "release.2010-03-04".
+// A trailing + indicates that the tree had local modifications
+// at the time of the build.
+func Version() string { return defaultVersion }
diff --git a/src/pkg/runtime/mkversion.c b/src/pkg/runtime/mkversion.c
new file mode 100644
index 00000000000..bf33c0f85bb
--- /dev/null
+++ b/src/pkg/runtime/mkversion.c
@@ -0,0 +1,15 @@
+#include <u.h>
+#include <libc.h>
+
+char *template =
+	"// generated by mkversion.c; do not edit.\n"
+	"package runtime\n"
+	"const defaultGoroot = \"%s\"\n"
+	"const defaultVersion = \"%s\"\n";
+
+void
+main(void)
+{
+	print(template, getgoroot(), getgoversion());
+	exits(0);
+}
diff --git a/src/pkg/runtime/runtime.c b/src/pkg/runtime/runtime.c
index 3a94c8bce26..ed1bdcab8a5 100644
--- a/src/pkg/runtime/runtime.c
+++ b/src/pkg/runtime/runtime.c
@@ -206,6 +206,15 @@ getenv(int8 *s)
 	return nil;
 }
 
+void
+·getgoroot(String out)
+{
+	byte *p;
+	
+	p = getenv("GOROOT");
+	out = gostring(p);
+	FLUSH(&out);
+}
 
 int32
 atoi(byte *p)