[1/2] Fix "info break" + "catch catch" + -static-{libstdc++,libgcc}

diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
index b49be762a2f..d508921fdc5 100644
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -6033,13 +6033,7 @@  print_one_breakpoint_location (struct breakpoint *b,
 
   /* 5 and 6 */
   if (b->ops != NULL && b->ops->print_one != NULL)
-    {
-      /* Although the print_one can possibly print all locations,
-	 calling it here is not likely to get any nice result.  So,
-	 make sure there's just one location.  */
-      gdb_assert (b->loc == NULL || b->loc->next == NULL);
-      b->ops->print_one (b, last_loc);
-    }
+    b->ops->print_one (b, last_loc);
   else
     switch (b->type)
       {
diff --git a/gdb/testsuite/gdb.cp/except-multi-location-lib.cc b/gdb/testsuite/gdb.cp/except-multi-location-lib.cc
new file mode 100644
index 00000000000..8767d756b33
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/except-multi-location-lib.cc
@@ -0,0 +1,25 @@ 
+/* Copyright 2019 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/>.  */
+
+void
+trycatch_lib ()
+{
+  try
+    {
+      throw 1;
+    }
+  catch (...)
+    {
+    }
+}
diff --git a/gdb/testsuite/gdb.cp/except-multi-location-main.cc b/gdb/testsuite/gdb.cp/except-multi-location-main.cc
new file mode 100644
index 00000000000..161897a22ee
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/except-multi-location-main.cc
@@ -0,0 +1,36 @@ 
+/* Copyright 2019 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/>.  */
+
+extern void trycatch_lib ();
+
+void
+trycatch_main ()
+{
+  try
+    {
+      throw 1;
+    }
+  catch (...)
+    {
+    }
+}
+
+int
+main ()
+{
+  trycatch_lib ();
+  trycatch_main ();
+
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.cp/except-multi-location.exp b/gdb/testsuite/gdb.cp/except-multi-location.exp
new file mode 100644
index 00000000000..60d6d0b9351
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/except-multi-location.exp
@@ -0,0 +1,87 @@ 
+# Copyright 2019 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/>.
+
+# Regression test for a GDB internal error that would trigger if a
+# "catch catch" catchpoint ended up with multiple locations.  This
+# testcase exercises that scenario by building the binary with
+# -static-libgcc/-static-libstdc++ and a shared library that depends
+# on the libstc++.so DSO (which is how GDB was built and revealed the
+# bug), and vice versa.
+
+if {[skip_shlib_tests]} {
+    return 0
+}
+
+# STATIC_BIN indicates whether to build the main binary with
+# -static-libgcc/-static-libstdc++.  STATIC_LIB is the same, but for
+# the shared library.
+proc test_multi_libstdcpp {static_bin static_lib} {
+    global srcdir subdir
+    global decimal hex
+
+    # Library file.
+    set libname "except-multi-location-lib"
+    set srcfile_lib ${srcdir}/${subdir}/${libname}.cc
+    set binfile_lib [standard_output_file ${libname}-$static_bin-$static_lib.so]
+    set lib_flags {debug c++}
+    if {$static_lib} {
+	lappend lib_flags additional_flags=-static-libgcc additional_flags=-static-libstdc++
+    }
+
+    # Binary file.
+    set testfile "except-multi-location-main"
+    set srcfile ${srcdir}/${subdir}/${testfile}.cc
+    set binfile [standard_output_file ${testfile}-$static_bin-$static_lib]
+    set bin_flags [list debug c++ shlib=${binfile_lib}]
+    if {$static_bin} {
+	lappend bin_flags additional_flags=-static-libgcc additional_flags=-static-libstdc++
+    }
+
+    if { [gdb_compile_shlib ${srcfile_lib} ${binfile_lib} $lib_flags] != ""
+	 || [gdb_compile ${srcfile} ${binfile} executable $bin_flags] != "" } {
+	untested "failed to compile"
+	return -1
+    }
+
+    clean_restart
+
+    gdb_load ${binfile}
+    gdb_load_shlib $binfile_lib
+
+    if ![runto_main] {
+	fail "can't run to main"
+	return 0
+    }
+
+    gdb_test "catch catch" "Catchpoint \[0-9\]+ \\(catch\\)" \
+	"catch catch"
+    gdb_test "catch throw" "Catchpoint \[0-9\]+ \\(throw\\)" \
+	"catch throw"
+    gdb_test "catch rethrow" "Catchpoint \[0-9\]+ \\(rethrow\\)" \
+	"catch rethrow"
+
+    set ws "\[ \t\]*"
+    gdb_test "info breakpoints" \
+	[multi_line \
+	     "${decimal}${ws}breakpoint${ws}keep${ws}y${ws}${hex}${ws}exception catch" \
+	     "${decimal}${ws}breakpoint${ws}keep${ws}y${ws}${hex}${ws}exception throw" \
+	     "${decimal}${ws}breakpoint${ws}keep${ws}y${ws}${hex}${ws}exception rethrow"]
+}
+
+# Try different static/not-static combinations.
+foreach_with_prefix static_lib {"0" "1"} {
+    foreach_with_prefix static_bin {"0" "1"} {
+	test_multi_libstdcpp $static_lib $static_bin
+    }
+}