Match demangled name in "skip"

PR gdb/26598 notes that, before commit bcfe6157ca28 ("Use the linkage
name if it exists"), the "skip" command would match the demangled name
of a symbol, but now only matches the linkage name.

This patch fixes this regression.  I looked at all calls to
function_name_is_marked_for_skip, and only one used the linkage name.

2020-09-16  Tom Tromey  <tromey@adacore.com>

	PR gdb/26598:
	* infrun.c (fill_in_stop_func): Use find_pc_partial_function_sym.

gdb/testsuite/ChangeLog
2020-09-16  Tom Tromey  <tromey@adacore.com>

	PR gdb/26598:
	* gdb.base/skipcxx.exp: New file.
	* gdb.base/skipcxx.cc: New file.

3 files changed, 67 insertions, 0 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 0a29d7f..a0211e6 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,9 @@
+2020-09-16  Tom Tromey  <tromey@adacore.com>
+
+	PR gdb/26598:
+	* gdb.base/skipcxx.exp: New file.
+	* gdb.base/skipcxx.cc: New file.
+
 2020-09-16  Tom de Vries  <tdevries@suse.de>
 
 	PR testsuite/26617
diff --git a/gdb/testsuite/gdb.base/skipcxx.cc b/gdb/testsuite/gdb.base/skipcxx.cc
new file mode 100644
index 0000000..5f65345
--- /dev/null
+++ b/gdb/testsuite/gdb.base/skipcxx.cc
@@ -0,0 +1,32 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2020 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+namespace somename
+{
+int func()
+{
+  return 23;
+}
+}
+
+int
+main ()
+{
+  int x = somename::func ();
+
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.base/skipcxx.exp b/gdb/testsuite/gdb.base/skipcxx.exp
new file mode 100644
index 0000000..1914451
--- /dev/null
+++ b/gdb/testsuite/gdb.base/skipcxx.exp
@@ -0,0 +1,29 @@
+#   Copyright 2020 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+standard_testfile .cc
+
+if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} {
+    return -1
+}
+
+if ![runto_main] {
+    fail "can't run to main"
+    return
+}
+
+gdb_test "skip -rfu ^somename::" \
+    [string_to_regexp "Function(s) ^somename:: will be skipped when stepping."]
+gdb_test "step" ".* return 0;"