[PATCH 4/8] gdb.trace: Use manually-defined start labels in unavailable-dwarf-piece.exp

["Marcin Kościelnicki" <koriakin@0x04.net>]

On powerpc64, foo/bar point to a function descriptor, not to function code.
Since there are no global labels pointing at the actual function code,
let's make our own.

Regression-tested on x86_64.

gdb/testsuite/ChangeLog:

	* gdb.trace/unavailable-dwarf-piece.c (foo): Add foo_start_lbl label.
	(bar): Add bar_start_lbl label.
	* gdb.trace/unavailable-dwarf-piece.exp: Use foo/bar_start_lbl instead
	of foo/bar for emitting DWARF and tracing.
---
 gdb/testsuite/ChangeLog                             | 7 +++++++
 gdb/testsuite/gdb.trace/unavailable-dwarf-piece.c   | 2 ++
 gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp | 8 ++++----
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index a96156d..e2835d5 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,10 @@
+2016-03-05  Marcin Kościelnicki  <koriakin@0x04.net>
+
+	* gdb.trace/unavailable-dwarf-piece.c (foo): Add foo_start_lbl label.
+	(bar): Add bar_start_lbl label.
+	* gdb.trace/unavailable-dwarf-piece.exp: Use foo/bar_start_lbl instead
+	of foo/bar for emitting DWARF and tracing.
+
 2016-03-05  Sergio Durigan Junior  <sergiodj@redhat.com>
 
 	* Makefile.in (DEFAULT_RACY_ITER): New variable.
diff --git a/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.c b/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.c
index 94d611f..5d12c52 100644
--- a/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.c
+++ b/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.c
@@ -54,6 +54,7 @@ dummy (void)
 int
 foo (struct s x, struct s y, struct s z)
 {
+  asm (".global foo_start_lbl\nfoo_start_lbl:");
   dummy ();
   asm (".global foo_end_lbl\nfoo_end_lbl:");
   return 0;
@@ -62,6 +63,7 @@ foo (struct s x, struct s y, struct s z)
 int
 bar (struct t x, struct t y, struct t z)
 {
+  asm (".global bar_start_lbl\nbar_start_lbl:");
   dummy ();
   asm (".global bar_end_lbl\nbar_end_lbl:");
   return 0;
diff --git a/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp b/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp
index b5052d1..66a09a5 100644
--- a/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp
+++ b/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp
@@ -175,7 +175,7 @@ Dwarf::assemble $asm_file {
 	    DW_TAG_subprogram {
 		{name foo}
 		{decl_file 1 sdata}
-		{low_pc foo addr}
+		{low_pc foo_start_lbl addr}
 		{high_pc foo_end_lbl addr}
 	    } {
 		DW_TAG_formal_parameter {
@@ -220,7 +220,7 @@ Dwarf::assemble $asm_file {
 	    DW_TAG_subprogram {
 		{name bar}
 		{decl_file 1 sdata}
-		{low_pc bar addr}
+		{low_pc bar_start_lbl addr}
 		{high_pc bar_end_lbl addr}
 	    } {
 		DW_TAG_formal_parameter {
@@ -306,7 +306,7 @@ if ![gdb_target_supports_trace] {
 gdb_breakpoint "end"
 
 with_test_prefix "tracing foo" {
-    gdb_test "trace foo" ".*"
+    gdb_test "trace *foo_start_lbl" ".*"
     gdb_test_no_output "tstart"
     gdb_test "continue" "Continuing\\.\[ \r\n\]+Breakpoint.*"
     gdb_test_no_output "tstop"
@@ -320,7 +320,7 @@ with_test_prefix "tracing foo" {
 }
 
 with_test_prefix "tracing bar" {
-    gdb_test "trace bar" ".*"
+    gdb_test "trace *bar_start_lbl" ".*"
     gdb_test_no_output "tstart"
     gdb_test "continue" "Continuing\\.\[ \r\n\]+Breakpoint.*"
     gdb_test_no_output "tstop"
-- 
2.7.2