GDB tests for Go language support: remove unnecessary first breakpoint

On s390x targets some of the Go test cases fail because the first
breakpoint happens to be at the same spot as the breakpoint at
main.main.  When such a test case tries to continue to the first
breakpoint, the program runs until the end instead, and the test fails
like this:

FAIL: gdb.go/handcall.exp: Going to first breakpoint (the program exited)

This patch removes all the handling related to the first breakpoint in
those cases.  After applying the patch, the tests run successfully on
s390x.

gdb/testsuite/ChangeLog:

	* gdb.go/handcall.exp: Remove all logic related to the first
	breakpoint and rely on go_runto_main instead.
	* gdb.go/strings.exp: Likewise.
	* gdb.go/unsafe.exp: Likewise.
	* gdb.go/hello.exp: Likewise.  Also rename the remaining
	breakpoint marker to "breakpoint 1".
	* gdb.go/handcall.go: Remove comment "set breakpoint 1 here".
	* gdb.go/strings.go: Likewise.
	* gdb.go/unsafe.go: Likewise.
	* gdb.go/hello.go: Likewise.  Also remove the second occurrence of
	"set breakpoint 2 here" and rename the remaining breakpoint marker
	to "breakpoint 1".

gdb/testsuite/ChangeLog

@@ -1,3 +1,18 @@
+2015-04-16  Andreas Arnez  <arnez@linux.vnet.ibm.com>
+
+	* gdb.go/handcall.exp: Remove all logic related to the first
+	breakpoint and rely on go_runto_main instead.
+	* gdb.go/strings.exp: Likewise.
+	* gdb.go/unsafe.exp: Likewise.
+	* gdb.go/hello.exp: Likewise.  Also rename the remaining
+	breakpoint marker to "breakpoint 1".
+	* gdb.go/handcall.go: Remove comment "set breakpoint 1 here".
+	* gdb.go/strings.go: Likewise.
+	* gdb.go/unsafe.go: Likewise.
+	* gdb.go/hello.go: Likewise.  Also remove the second occurrence of
+	"set breakpoint 2 here" and rename the remaining breakpoint marker
+	to "breakpoint 1".
+
 2015-04-15  Simon Marchi  <simon.marchi@ericsson.com>
 
 	* gdb.python/py-framefilter.py (ErrorFilter.filter): Use map function

gdb/testsuite/gdb.go/handcall.exp

@@ -27,18 +27,10 @@ if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} {debug go}] } {
     return -1
 }
 
-set bp_location1 [gdb_get_line_number "set breakpoint 1 here"]
-
 if { [go_runto_main] < 0 } {
     untested $testfile
     return -1
 }
 
-if { [gdb_breakpoint ${srcfile}:${bp_location1}] } {
-    pass "setting breakpoint 1"
-}
-
-gdb_test "cont" "Breakpoint .*:${bp_location1}.*" "Going to first breakpoint"
-
 gdb_test "print add (1, 2)" " = 3"
 gdb_test "print main.add (1, 2)" " = 3"

gdb/testsuite/gdb.go/handcall.go

@@ -11,5 +11,5 @@ func sub (a,b int) (int) {
 var v_int int
 
 func main () {
-  v_int = 42 // set breakpoint 1 here
+  v_int = 42
 }

gdb/testsuite/gdb.go/hello.exp

@@ -28,19 +28,12 @@ if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} {debug go}] } {
 }
 
 set bp_location1 [gdb_get_line_number "set breakpoint 1 here"]
-set bp_location2 [gdb_get_line_number "set breakpoint 2 here"]
 
 if { [go_runto_main] < 0 } {
     untested $testfile
     return -1
 }
 
-if { [gdb_breakpoint ${srcfile}:${bp_location1}] } {
-    pass "setting breakpoint 1"
-}
-
-gdb_test "cont" "Breakpoint .*:${bp_location1}.*" "Going to first breakpoint"
-
 # This used to print "", i.e., the local "st" initialized as "".
 setup_xfail "*-*-*"
 
@@ -48,11 +41,11 @@ gdb_test "print st" \
     ".* = $hex \"\"" \
     "Starting string check"
 
-if { [gdb_breakpoint ${srcfile}:${bp_location2}] } {
-    pass "setting breakpoint 2"
+if { [gdb_breakpoint ${srcfile}:${bp_location1}] } {
+    pass "setting breakpoint 1"
 }
 
-gdb_test "cont" "Breakpoint .*:${bp_location2}.*" "Going to second breakpoint"
+gdb_test "cont" "Breakpoint .*:${bp_location1}.*" "Going to first breakpoint"
 
 gdb_test "print st" \
     ".* = $hex \"Hello, world!\"" \

gdb/testsuite/gdb.go/hello.go

@@ -5,8 +5,8 @@ import "fmt"
 var myst = "Shall we?"
 
 func main () {
-  fmt.Println ("Before assignment") // set breakpoint 1 here
+  fmt.Println ("Before assignment")
   st := "Hello, world!" // this intentionally shadows the global "st"
-  fmt.Println (st) // set breakpoint 2 here
-  fmt.Println (myst) // set breakpoint 2 here
+  fmt.Println (st) // set breakpoint 1 here
+  fmt.Println (myst)
 }

gdb/testsuite/gdb.go/strings.exp

@@ -25,17 +25,9 @@ if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} {debug go}] } {
     return -1
 }
 
-set bp_location1 [gdb_get_line_number "set breakpoint 1 here"]
-
 if { [go_runto_main] < 0 } {
     untested $testfile
     return -1
 }
 
-if { [gdb_breakpoint ${srcfile}:${bp_location1}] } {
-    pass "setting breakpoint 1"
-}
-
-gdb_test "cont" "Breakpoint .*:${bp_location1}.*" "Going to first breakpoint"
-
 gdb_test {print "abc" + "def"} {.* = "abcdef"}

gdb/testsuite/gdb.go/strings.go

@@ -5,6 +5,6 @@ import "fmt"
 var v_string string = "foo"
 
 func main () {
-  fmt.Println ("hello") // set breakpoint 1 here
+  fmt.Println ("hello")
   fmt.Printf ("%s\n", v_string)
 }

gdb/testsuite/gdb.go/unsafe.exp

@@ -27,17 +27,9 @@ if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} {debug go}] } {
     return -1
 }
 
-set bp_location1 [gdb_get_line_number "set breakpoint 1 here"]
-
 if { [go_runto_main] < 0 } {
     untested $testfile
     return -1
 }
 
-if { [gdb_breakpoint ${srcfile}:${bp_location1}] } {
-    pass "setting breakpoint 1"
-}
-
-gdb_test "cont" "Breakpoint .*:${bp_location1}.*" "Going to first breakpoint"
-
 gdb_test "print unsafe.Sizeof(42)" ".* = 4"

gdb/testsuite/gdb.go/unsafe.go

@@ -6,6 +6,6 @@ import ("fmt"
 var mystring = "Shall we?"
 
 func main () {
-  fmt.Printf ("%d\n", unsafe.Sizeof (42)) // set breakpoint 1 here
+  fmt.Printf ("%d\n", unsafe.Sizeof (42))
   fmt.Printf ("%d\n", unsafe.Sizeof (mystring))
 }