This bug is already fixed in the RHEL-7.1 GDB version. However, it is also important to add a testcase, so the following is a patch to add this test. This is the original message submitted to gdb-patches: From: Sergio Durigan Junior To: GDB Patches Subject: [PATCH] Add test for global variable that is nested by another DSO Date: Thu, 4 Sep 2014 17:32:53 -0400 Message-Id: <1409866373-16413-1-git-send-email-sergiodj@redhat.com> This is just a testcase addition that I am proposing for upstream GDB. We have this in our internal tree, and the related RH bug is: (You might not be able to see all the comments without privileges.) This bug is about a global variable that got incorrectly displayed by GDB. This bug has already been fixed a long time ago by Joel's commit: commit 19630284f570790ebf6d50bfb43caa1f125ee88a Author: Joel Brobecker Date: Tue Jun 5 13:50:50 2012 +0000 But I think a testcase for it wouldn't hurt. So, consider the following scenario: $ cat solib1.c int test; void c_main (void) { test = 42; } $ cat solib2.c int test; void b_main (void) { test = 42; } $ cat main.c int main (int argc, char *argv[]) { c_main (); b_main (); return 0; } $ gcc -g -fPIC -shared -o libSO1.so -c solib1.c $ gcc -g -fPIC -shared -o libSO2.so -c solib2.c $ gcc -g -o main -L$PWD -lSO1 -lSO2 main.c $ LD_LIBRARY_PATH=. gdb -q -batch -ex 'b c_main' -ex r -ex n -ex 'p test' ./main ... $1 = 0 This happened with GDB before Joel's commit above. Now, things work and GDB is able to correctly display the nested global variable: $ LD_LIBRARY_PATH=. gdb -q -batch -ex 'b c_main' -ex r -ex n -ex 'p test' ./main ... $1 = 42 The testcase attached tests this behavior. gdb/testsuite/ChangeLog: 2014-09-04 Sergio Durigan Junior * gdb.base/global-var-nested-by-dso-solib1.c: New file. * gdb.base/global-var-nested-by-dso-solib2.c: Likewise. * gdb.base/global-var-nested-by-dso.c: Likewise. * gdb.base/global-var-nested-by-dso.exp: Likewise. Index: gdb-7.6.1/gdb/testsuite/gdb.base/global-var-nested-by-dso-solib1.c =================================================================== --- /dev/null +++ gdb-7.6.1/gdb/testsuite/gdb.base/global-var-nested-by-dso-solib1.c @@ -0,0 +1,24 @@ +/* Copyright 2014 Free Software Foundation, Inc. + + This file is part of GDB. + + 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 . */ + +int test; + +void +c_main (void) +{ + test = 42; +} Index: gdb-7.6.1/gdb/testsuite/gdb.base/global-var-nested-by-dso-solib2.c =================================================================== --- /dev/null +++ gdb-7.6.1/gdb/testsuite/gdb.base/global-var-nested-by-dso-solib2.c @@ -0,0 +1,24 @@ +/* Copyright 2014 Free Software Foundation, Inc. + + This file is part of GDB. + + 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 . */ + +int test; + +void +b_main (void) +{ + test = 42; +} Index: gdb-7.6.1/gdb/testsuite/gdb.base/global-var-nested-by-dso.c =================================================================== --- /dev/null +++ gdb-7.6.1/gdb/testsuite/gdb.base/global-var-nested-by-dso.c @@ -0,0 +1,24 @@ +/* Copyright 2014 Free Software Foundation, Inc. + + This file is part of GDB. + + 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 . */ + +int +main (int argc, char *argv[]) +{ + c_main (); + b_main (); + return 0; +} Index: gdb-7.6.1/gdb/testsuite/gdb.base/global-var-nested-by-dso.exp =================================================================== --- /dev/null +++ gdb-7.6.1/gdb/testsuite/gdb.base/global-var-nested-by-dso.exp @@ -0,0 +1,55 @@ +# Copyright 2014 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 . + +if { [skip_shlib_tests] } { + return 0 +} + +standard_testfile + +set lib1name $testfile-solib1 +set srcfile_lib1 $srcdir/$subdir/$lib1name.c +set binfile_lib1 [standard_output_file $lib1name.so] + +set lib2name $testfile-solib2 +set srcfile_lib2 $srcdir/$subdir/$lib2name.c +set binfile_lib2 [standard_output_file $lib2name.so] + +if { [gdb_compile_shlib $srcfile_lib1 $binfile_lib1 \ + [list debug additional_flags=-fPIC]] != "" } { + untested "Could not compile $binfile_lib1." + return -1 +} + +if { [gdb_compile_shlib $srcfile_lib2 $binfile_lib2 \ + [list debug additional_flags=-fPIC]] != "" } { + untested "Could not compile $binfile_lib2." + return -1 +} + +if { [gdb_compile $srcdir/$subdir/$srcfile $binfile executable \ + [list debug shlib=$binfile_lib1 shlib=$binfile_lib2]] != "" } { + return -1 +} + +clean_restart $binfile + +if { ![runto_main] } { + return -1 +} + +gdb_test "next" "$decimal.*b_main \\(\\);" +gdb_test "next" "$decimal.*return 0;" +gdb_test "print test" " = 42"