[PATCH] PR testsuite/69181: ensure expected multiline outputs is cleared per-test

[David Malcolm]

The root cause here is that the logic to reset the list of expected
multiline outputs was being run from:
  handle-multiline-outputs, called by
    prune.exp's prune_gcc_output
and none of that happens if the test is skipped by a target exclusion
in dg-do.

This patch moves the clearing of the relevant list to happen in
gcc-dg.exp's wrapper for dg-test, so it happens per-test even if the
test is skipped.

Successfully bootstrapped&regrtested on x86_64-pc-linux-gnu; adds
1 UNSUPPORTED (by design: gcc.dg/pr69181-1.c) and 1 PASS to gcc.sum.

OK for trunk?

gcc/testsuite/ChangeLog:
	PR testsuite/69181
	* gcc.dg/pr69181-1.c: New test file.
	* gcc.dg/pr69181-2.c: New test file.
	* lib/gcc-dg.exp (dg-test): Reset global
	multiline_expected_outputs to the empty list after each
	call to the real dg-test.
	* lib/multiline.exp (_multiline_expected_outputs): Rename this
	global to...
	(multiline_expected_outputs): ...this, and updated comments to
	note that it is modified from gcc-dg.exp.
	(dg-end-multiline-output): Update for the above renaming.
	(handle-multiline-outputs): Likewise.  Remove the clearing
	of the expected outputs to the empty list.
---
 gcc/testsuite/gcc.dg/pr69181-1.c |  7 +++++++
 gcc/testsuite/gcc.dg/pr69181-2.c |  4 ++++
 gcc/testsuite/lib/gcc-dg.exp     |  2 ++
 gcc/testsuite/lib/multiline.exp  | 22 +++++++++-------------
 4 files changed, 22 insertions(+), 13 deletions(-)
 create mode 100644 gcc/testsuite/gcc.dg/pr69181-1.c
 create mode 100644 gcc/testsuite/gcc.dg/pr69181-2.c

diff --git a/gcc/testsuite/gcc.dg/pr69181-1.c b/gcc/testsuite/gcc.dg/pr69181-1.c
new file mode 100644
index 0000000..e851f0c
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr69181-1.c
@@ -0,0 +1,7 @@
+/* { dg-do compile { target this_will_not_be_matched-*-* } } */
+
+/* { dg-begin-multiline-output "" }
+   This message should never be checked for.
+   In particular, it shouldn't be checked for in the *next*
+   test case.
+   { dg-end-multiline-output "" } */
diff --git a/gcc/testsuite/gcc.dg/pr69181-2.c b/gcc/testsuite/gcc.dg/pr69181-2.c
new file mode 100644
index 0000000..dca90dc
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr69181-2.c
@@ -0,0 +1,4 @@
+/* Dummy test case, to verify that the dg-begin-multiline-output directive
+   from pr69181-1.c isn't erroneously expected to be handled in *this*
+   test case.  */
+int make_non_empty;
diff --git a/gcc/testsuite/lib/gcc-dg.exp b/gcc/testsuite/lib/gcc-dg.exp
index f9ec206..f778bca 100644
--- a/gcc/testsuite/lib/gcc-dg.exp
+++ b/gcc/testsuite/lib/gcc-dg.exp
@@ -836,6 +836,7 @@ if { [info procs saved-dg-test] == [list] } {
 	global testname_with_flags
 	global set_target_env_var
 	global keep_saved_temps_suffixes
+	global multiline_expected_outputs
 
 	if { [ catch { eval saved-dg-test $args } errmsg ] } {
 	    set saved_info $errorInfo
@@ -871,6 +872,7 @@ if { [info procs saved-dg-test] == [list] } {
 	if [info exists testname_with_flags] {
 	    unset testname_with_flags
 	}
+	set multiline_expected_outputs []
     }
 }
 
diff --git a/gcc/testsuite/lib/multiline.exp b/gcc/testsuite/lib/multiline.exp
index 6b2c1da..fd7affc 100644
--- a/gcc/testsuite/lib/multiline.exp
+++ b/gcc/testsuite/lib/multiline.exp
@@ -47,17 +47,18 @@
 # to have the testsuite verify the expected output.
 
 ############################################################################
-# Global variables.  Although global, these are intended to only be used from
-# within multiline.exp.
+# Global variables.
 ############################################################################
 
+# This is intended to only be used from within multiline.exp.
 # The line number of the last dg-begin-multiline-output directive.
 set _multiline_last_beginning_line -1
 
 # A list of
 #   first-line-number, last-line-number, lines
 # where each "lines" is a list of strings.
-set _multiline_expected_outputs []
+# This is cleared at the end of each test by gcc-dg.exp's wrapper for dg-test.
+set multiline_expected_outputs []
 
 ############################################################################
 # Exported functions.
@@ -94,9 +95,9 @@ proc dg-end-multiline-output { args } {
     verbose "lines: $lines" 3
     # Create an entry of the form:  first-line, last-line, lines
     set entry [list $_multiline_last_beginning_line $line $lines]
-    global _multiline_expected_outputs
-    lappend _multiline_expected_outputs $entry
-    verbose "within dg-end-multiline-output: _multiline_expected_outputs: $_multiline_expected_outputs" 3
+    global multiline_expected_outputs
+    lappend multiline_expected_outputs $entry
+    verbose "within dg-end-multiline-output: multiline_expected_outputs: $multiline_expected_outputs" 3
 
     set _multiline_last_beginning_line -1
 }
@@ -107,14 +108,12 @@ proc dg-end-multiline-output { args } {
 # those that weren't found.
 #
 # It returns a pruned version of its output.
-#
-# It also clears the list of expected multiline outputs.
 
 proc handle-multiline-outputs { text } {
-    global _multiline_expected_outputs
+    global multiline_expected_outputs
     global testname_with_flags
     set index 0
-    foreach entry $_multiline_expected_outputs {
+    foreach entry $multiline_expected_outputs {
 	verbose "  entry: $entry" 3
 	set start_line [lindex $entry 0]
 	set end_line   [lindex $entry 1]
@@ -140,9 +139,6 @@ proc handle-multiline-outputs { text } {
 	set index [expr $index + 1]
     }
 
-    # Clear the list of expected multiline outputs
-    set _multiline_expected_outputs []
-
     return $text
 }
 
-- 
1.8.5.3