[PATCH] Adjust test gdb.ada/ptype_tagged_param.exp for when GNAT runtime does not have debug info

This test verifies that GDB correctly identifies the run-time type of
"s" as being the type "Circle".  However, that can only be done
correctly if the GNAT runtime has been compiled and shipped with debug
information, so that GDB can poke in its internal data structures.
Currently the test fails when when running against a GNAT runtime
without debug info.  This is the case, for example, on Arch Linux using
the distribution package.

This patch adds a helper in lib/ada.exp to check whether the GNAT
runtime has debug info or not.  It then uses it in
gdb.ada/ptype_tagged_param.exp to expect a different result, depending
on whether we have debug info or not in the runtime.

At first, I made it so we would XFAIL the test, in the absence of debug
info, but then I thought that we might as well test for the output we
expect in the absence of debug info instead.

gdb/testsuite/ChangeLog:

	* lib/ada.exp (gnat_runtime_has_debug_info): New proc.
	* lib/gnat_debug_info_test.adb: New file.
	* gdb.ada/ptype_tagged_param.exp: Use
	gnat_runtime_has_debug_info, expect a different output if
	runtime does not have debug info.

4 files changed, 71 insertions, 4 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 488196c6eae..31208bdffc8 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,11 @@
+2019-12-27  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* lib/ada.exp (gnat_runtime_has_debug_info): New proc.
+	* lib/gnat_debug_info_test.adb: New file.
+	* gdb.ada/ptype_tagged_param.exp: Use
+	gnat_runtime_has_debug_info, expect a different output if
+	runtime does not have debug info.
+
 2019-12-20  Simon Marchi  <simon.marchi@efficios.com>
 
 	* lib/sym-info-cmds.exp (GDBInfoSymbols::check_no_entry): Add
diff --git a/gdb/testsuite/gdb.ada/ptype_tagged_param.exp b/gdb/testsuite/gdb.ada/ptype_tagged_param.exp
index 567ef8251d9..08d3e5dcff4 100644
--- a/gdb/testsuite/gdb.ada/ptype_tagged_param.exp
+++ b/gdb/testsuite/gdb.ada/ptype_tagged_param.exp
@@ -21,14 +21,31 @@ if {[gdb_compile_ada "${srcfile}" "${binfile}" executable [list debug ]] != "" }
   return -1
 }
 
+set has_runtime_debug_info [gnat_runtime_has_debug_info]
+
 clean_restart ${testfile}
 
 if ![runto "position_x" ] then {
   return -1
 }
 
-set eol "\[\r\n\]+"
-set sp "\[ \t\]*"
+# Identifying the runtime type of S can only be done when we have the debug
+# info for the GNAT runtime.
+
+if { $has_runtime_debug_info } {
+    gdb_test "ptype s" \
+	[multi_line \
+	    "type = <ref> new pck.shape with record" \
+	    "    r: integer;" \
+	    "end record"] \
+	"ptype s, with debug info"
+} else {
+    gdb_test "ptype s" \
+	[multi_line \
+	    "type = <ref> tagged record" \
+	    "    x: integer;" \
+	    "    y: integer;" \
+	    "end record" ] \
+	"ptype s, without debug info"
+}
 
-gdb_test "ptype s" \
-         "type = <ref> new pck.shape with record${eol}${sp}r: integer;${eol}end record"
diff --git a/gdb/testsuite/lib/ada.exp b/gdb/testsuite/lib/ada.exp
index 45c41806a64..6f5961a822a 100644
--- a/gdb/testsuite/lib/ada.exp
+++ b/gdb/testsuite/lib/ada.exp
@@ -149,3 +149,39 @@ proc gnatmake_version_at_least { major } {
     # Unknown, return 1
     return 1
 }
+
+# Return 1 if the GNAT runtime appears to have debug info.
+
+gdb_caching_proc gnat_runtime_has_debug_info {
+    global srcdir
+
+    set src "$srcdir/lib/gnat_debug_info_test.adb"
+    set dst [standard_output_file "gnat_debug_info_test"]
+
+    if { [gdb_compile_ada $src $dst executable {debug}] != "" } {
+	fail "failed to compile gnat-debug-info test binary"
+	return 0
+    }
+
+    clean_restart $dst
+
+    if { ! [runto "GNAT_Debug_Info_Test"] } {
+	fail "failed to run to GNAT_Debug_Info_Test"
+	return 0
+    }
+
+    set has_debug_info 0
+
+    gdb_test_multiple "whatis __gnat_debug_raise_exception" "" {
+	-re "type = <text variable, no debug info>" { }
+	-re "type = void" {
+	    set has_debug_info 1
+	}
+	default {
+	    # Some other unexpected output...
+	    fail $gdb_test_name
+	}
+    }
+
+    return $has_debug_info
+}
diff --git a/gdb/testsuite/lib/gnat_debug_info_test.adb b/gdb/testsuite/lib/gnat_debug_info_test.adb
new file mode 100644
index 00000000000..b8f0b034358
--- /dev/null
+++ b/gdb/testsuite/lib/gnat_debug_info_test.adb
@@ -0,0 +1,6 @@
+with Ada.Text_IO;
+
+procedure GNAT_Debug_Info_Test is
+begin
+   Ada.Text_IO.Put_Line("Hello, world!");
+end GNAT_Debug_Info_Test;