8l, runtime: initial support for Plan 9

No multiple processes/locks, managed to compile
and run a hello.go (with print not fmt).  Also test/sieve.go
seems to run until 439 and stops with a
'throw: all goroutines are asleep - deadlock!'
- just like runtime/tiny.

based on Russ's suggestions at:
http://groups.google.com/group/comp.os.plan9/browse_thread/thread/cfda8b82535d2d68/243777a597ec1612

Build instructions:
cd src/pkg/runtime
make clean && GOOS=plan9 make install
this will build and install the runtime.

When linking with 8l, you should pass -s to suppress symbol
generation in the a.out, otherwise the generated executable will not run.

This is runtime only, the porting of the toolchain has already
been done: http://code.google.com/p/go-plan9/source/browse
in the plan9-quanstro branch.

R=rsc
CC=golang-dev
https://golang.org/cl/2273041

1 files changed, 8 insertions, 3 deletions

diff --git a/src/pkg/runtime/runtime.c b/src/pkg/runtime/runtime.c
index 4b09f7bcf7..a8f8177331 100644
--- a/src/pkg/runtime/runtime.c
+++ b/src/pkg/runtime/runtime.c
@@ -147,15 +147,20 @@ args(int32 c, uint8 **v)
 	argv = v;
 }
 
+extern int32 isplan9;
+
 void
 goargs(void)
 {
 	String *gargv;
 	String *genvv;
 	int32 i, envc;
-
-	for(envc=0; argv[argc+1+envc] != 0; envc++)
-		;
+	
+	if(isplan9)
+		envc=0;
+	else
+		for(envc=0; argv[argc+1+envc] != 0; envc++)
+			;
 
 	gargv = malloc(argc*sizeof gargv[0]);
 	genvv = malloc(envc*sizeof genvv[0]);