[PATCH][gdb/testsuite] Fix corefile-buildid.exp with check-read1

[Tom de Vries <tdevries@suse.de>]

Hi,

When running gdb.base/corefile-buildid.exp using check-read1, I run into:
...
FAIL: gdb.base/corefile-buildid.exp: shared: info files (timeout)
FAIL: gdb.base/corefile-buildid.exp: symlink shared: info files (timeout)
FAIL: gdb.base/corefile-buildid.exp: shared sepdebug: info files (timeout)
FAIL: gdb.base/corefile-buildid.exp: symlink shared sepdebug: info files \
  (timeout)
...

This is caused by attempting to match the output of an "info files" command
using a single gdb_test in check_exec_file.

Fix this by doing line-by-line matching in check_exec_file.

Tested on x86_64-linux, using make targets check and check-read1.

OK for trunk?

Thanks,
- Tom

[gdb/testsuite] Fix corefile-buildid.exp with check-read1

gdb/testsuite/ChangeLog:

2020-02-19  Tom de Vries  <tdevries@suse.de>

	* gdb.base/corefile-buildid.exp (check_exec_file): Match info files
	output line-by-line.

---
 gdb/testsuite/gdb.base/corefile-buildid.exp | 49 ++++++++++++++++++++++++++++-
 1 file changed, 48 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/gdb.base/corefile-buildid.exp b/gdb/testsuite/gdb.base/corefile-buildid.exp
index 158cbb6dc6..b9844ee354 100644
--- a/gdb/testsuite/gdb.base/corefile-buildid.exp
+++ b/gdb/testsuite/gdb.base/corefile-buildid.exp
@@ -108,8 +108,55 @@ proc append_debug_dir {debugdir} {
 # FILE.
 
 proc check_exec_file {file} {
+    global gdb_prompt
     send_log "expecting exec file \"$file\"\n"
-    gdb_test "info files" "Local exec file:\[\r\n\t\ \]+`[string_to_regexp $file]'.*"
+
+    # Get line with "Local exec file:".
+    set ok 0
+    gdb_test_multiple "info files" "" {
+	-re "^Local exec file:\r\n" {
+	    set test_name $gdb_test_name
+	    set ok 1
+	}
+	-re "^$gdb_prompt $" {
+	    fail $gdb_test_name
+	}
+	-re "^\[^\r\n\]*\r\n" {
+	    exp_continue
+	}
+    }
+
+    if { $ok == 0 } {
+	return
+    }
+
+    # Get subsequent line with $file.
+    set ok 0
+    gdb_test_multiple "" $test_name {
+	-re "^\[\t\ \]+`[string_to_regexp $file]'\[^\r\n\]*\r\n" {
+	    set ok 1
+	}
+	-re "^$gdb_prompt $" {
+	    fail $gdb_test_name
+	}
+	-re "^\[^\r\n\]*\r\n" {
+	    exp_continue
+	}
+    }
+
+    if { $ok == 0 } {
+	return
+    }
+
+    # Skip till prompt.
+    gdb_test_multiple "" $test_name {
+	-re "^$gdb_prompt $" {
+	    pass $gdb_test_name
+	}
+	-re "^\[^\r\n\]*\r\n" {
+	    exp_continue
+	}
+    }
 }
 
 # Test whether gdb can find an exec file from a core file's build-id.