libgo patch committed: Don't build test files that call SetCgoTraceback

[Ian Lance Taylor]

The libgo library doesn't provide runtime.SetCgoTraceback, which is
used by the gc toolchain to collect combined C/Go tracebacks.  Since
gccgo uses the normal C ABI, the function is not necessary for gccgo,
and it is difficult to implement.  This patch changes the runtime
tests so that the ones that require SetCgoTraceback are not built for
gccgo.  Those tests are not built today, but they will be soon.  Patch
bootstrapped and ran Go testsuite on x86_64-pc-linux-gnu.  Committed
to mainline.

Ian
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Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE	(revision 249555)
+++ gcc/go/gofrontend/MERGE	(working copy)
@@ -1,4 +1,4 @@
-bbc4f30a027ee09475d08aa4aeed1f2f7067e2e9
+e017833e4ce4a3bc3ba02eac4351b15c86157ec0
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
Index: libgo/go/runtime/testdata/testprogcgo/pprof.go
===================================================================
--- libgo/go/runtime/testdata/testprogcgo/pprof.go	(revision 249205)
+++ libgo/go/runtime/testdata/testprogcgo/pprof.go	(working copy)
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !gccgo
+
 package main
 
 // Run a slow C function saving a CPU profile.
Index: libgo/go/runtime/testdata/testprogcgo/raceprof.go
===================================================================
--- libgo/go/runtime/testdata/testprogcgo/raceprof.go	(revision 249205)
+++ libgo/go/runtime/testdata/testprogcgo/raceprof.go	(working copy)
@@ -3,6 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // +build linux,amd64
+// +build !gccgo
 
 package main
 
Index: libgo/go/runtime/testdata/testprogcgo/threadpprof.go
===================================================================
--- libgo/go/runtime/testdata/testprogcgo/threadpprof.go	(revision 249205)
+++ libgo/go/runtime/testdata/testprogcgo/threadpprof.go	(working copy)
@@ -3,6 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // +build !plan9,!windows
+// +build !gccgo
 
 package main
 
Index: libgo/go/runtime/testdata/testprogcgo/traceback.go
===================================================================
--- libgo/go/runtime/testdata/testprogcgo/traceback.go	(revision 249205)
+++ libgo/go/runtime/testdata/testprogcgo/traceback.go	(working copy)
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !gccgo
+
 package main
 
 // This program will crash.
Index: libgo/go/runtime/testdata/testprogcgo/tracebackctxt.go
===================================================================
--- libgo/go/runtime/testdata/testprogcgo/tracebackctxt.go	(revision 249205)
+++ libgo/go/runtime/testdata/testprogcgo/tracebackctxt.go	(working copy)
@@ -4,6 +4,8 @@
 
 // The __attribute__((weak)) used below doesn't seem to work on Windows.
 
+// +build !gccgo
+
 package main
 
 // Test the context argument to SetCgoTraceback.
Index: libgo/go/runtime/testdata/testprogcgo/tracebackctxt_c.c
===================================================================
--- libgo/go/runtime/testdata/testprogcgo/tracebackctxt_c.c	(revision 249205)
+++ libgo/go/runtime/testdata/testprogcgo/tracebackctxt_c.c	(working copy)
@@ -5,6 +5,8 @@
 // The C definitions for tracebackctxt.go. That file uses //export so
 // it can't put function definitions in the "C" import comment.
 
+// +build !gccgo
+
 #include <stdlib.h>
 #include <stdint.h>