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Comments from Sergio Durigan Junior:
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  The "proper" fix for this whole problem would be to backport the
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  "ambiguous linespec" patch series.  However, it is really not
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  recommended to do that for RHEL GDB, because the patch series is too
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  big and could introduce unwanted regressions.  Instead, what we
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  chose to do was to replace the gdb_assert call by a warning (which
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  allows the user to continue the debugging session), and tell the
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  user that, although more than one location was found for his/her
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  breakpoint, only one will be used.
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Index: gdb-7.12/gdb/testsuite/gdb.cp/gdb-rhbz1186476-internal-error-unqualified-name-re-set-main.cc
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===================================================================
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--- /dev/null	1970-01-01 00:00:00.000000000 +0000
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+++ gdb-7.12/gdb/testsuite/gdb.cp/gdb-rhbz1186476-internal-error-unqualified-name-re-set-main.cc	2016-10-20 21:06:31.849854180 +0200
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@@ -0,0 +1,22 @@
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+/* This testcase is part of GDB, the GNU debugger.
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+
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+   Copyright 2015 Free Software Foundation, Inc.
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+
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+   This program is free software; you can redistribute it and/or modify
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+   it under the terms of the GNU General Public License as published by
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+   the Free Software Foundation; either version 3 of the License, or
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+   (at your option) any later version.
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+
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+   This program is distributed in the hope that it will be useful,
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+   but WITHOUT ANY WARRANTY; without even the implied warranty of
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+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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+   GNU General Public License for more details.
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+
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+   You should have received a copy of the GNU General Public License
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+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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+
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+int
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+main (int argc, char *argv[])
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+{
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+  return 0;
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+}
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Index: gdb-7.12/gdb/testsuite/gdb.cp/gdb-rhbz1186476-internal-error-unqualified-name-re-set.cc
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===================================================================
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--- /dev/null	1970-01-01 00:00:00.000000000 +0000
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+++ gdb-7.12/gdb/testsuite/gdb.cp/gdb-rhbz1186476-internal-error-unqualified-name-re-set.cc	2016-10-20 21:06:31.850854188 +0200
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@@ -0,0 +1,26 @@
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+/* This testcase is part of GDB, the GNU debugger.
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+
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+   Copyright 2015 Free Software Foundation, Inc.
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+
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+   This program is free software; you can redistribute it and/or modify
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+   it under the terms of the GNU General Public License as published by
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+   the Free Software Foundation; either version 3 of the License, or
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+   (at your option) any later version.
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+
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+   This program is distributed in the hope that it will be useful,
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+   but WITHOUT ANY WARRANTY; without even the implied warranty of
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+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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+   GNU General Public License for more details.
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+
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+   You should have received a copy of the GNU General Public License
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+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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+
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+class C
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+  {
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+    public:
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+      C () {}
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+      C (int x) {}
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+  };
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+
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+C a;
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+C b (1);
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Index: gdb-7.12/gdb/testsuite/gdb.cp/gdb-rhbz1186476-internal-error-unqualified-name-re-set.exp
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===================================================================
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--- /dev/null	1970-01-01 00:00:00.000000000 +0000
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+++ gdb-7.12/gdb/testsuite/gdb.cp/gdb-rhbz1186476-internal-error-unqualified-name-re-set.exp	2016-10-20 21:09:33.408270526 +0200
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@@ -0,0 +1,51 @@
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+# Copyright 2015 Free Software Foundation, Inc.
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+
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+# This program is free software; you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation; either version 3 of the License, or
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+# (at your option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
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+
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+if { [skip_cplus_tests] } { continue }
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+if { [skip_shlib_tests] } { continue }
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+if { [is_remote target] } { continue }
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+if { [target_info exists use_gdb_stub] } { continue }
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+
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+set testfile gdb-rhbz1186476-internal-error-unqualified-name-re-set-main
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+set srcfile $testfile.cc
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+set executable $testfile
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+set binfile [standard_output_file $executable]
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+
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+set libtestfile gdb-rhbz1186476-internal-error-unqualified-name-re-set
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+set libsrcfile $libtestfile.cc
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+set sofile [standard_output_file lib$libtestfile.so]
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+
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+# Create and source the file that provides information about the compiler
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+# used to compile the test case.
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+if [get_compiler_info "c++"] {
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+    return -1
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+}
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+
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+if { [gdb_compile_shlib $srcdir/$subdir/$libsrcfile $sofile {debug c++ "additional_flags=-fPIC"}] != ""
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+     || [gdb_compile $srcdir/$subdir/$srcfile $binfile executable [list additional_flags=-Wl,-rpath,[file dirname ${sofile}] "c++" shlib=${sofile} ]] != ""} {
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+    untested $libtestfile.exp
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+    return -1
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+}
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+
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+clean_restart $executable
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+
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+gdb_test_no_output "set breakpoint pending on"
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+# gdb_breakpoint would print a failure because of some warning messages
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+gdb_test "break C::C" "Breakpoint $decimal \\(C::C\\) pending."
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+
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+#gdb_test "run" "warning: Found more than one location for breakpoint #$decimal; only the first location will be used.(\r\n)+Breakpoint $decimal, C::C.*"
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+gdb_test "run"
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+
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+gdb_test "info break" " in C::C\\(\\) at .* in C::C\\(int\\) at .*"