gdb/testsuite: avoid creating files in gdb/testsuite directory

I spotted that the test gdb.dwarf2/dw2-using-debug-str.exp was
creating an output file called debug_str_section in the root
build/gdb/testsuite directory instead of using the
build/gdb/testsuite/output/gdb.dwarf2/dw2-using-debug-str/ directory.

This appears to be caused by a missing '$' character.  We setup a
variable debug_str_section which contains a path within the output
directory, but then when we build the objcopy command we use
'debug_str_section' without a '$' prefix, as a result, we create the
debug_str_section file.

This commit adds the missing '$', the file is now created in the
output directory.

1 files changed, 1 insertions, 1 deletions

diff --git a/gdb/testsuite/gdb.dwarf2/dw2-using-debug-str.exp b/gdb/testsuite/gdb.dwarf2/dw2-using-debug-str.exp
index d27554f..4d1c490 100644
--- a/gdb/testsuite/gdb.dwarf2/dw2-using-debug-str.exp
+++ b/gdb/testsuite/gdb.dwarf2/dw2-using-debug-str.exp
@@ -105,7 +105,7 @@ gdb_test "p global_var" " = \\{aa = 0, bb = 0, cc = 0\\}"
 # cc-with-dwz-m.exp and cc-with-gnu-debuglink.exp.  Handle this by
 # skipping the remainder of the test-case.
 set debug_str_section "${binfile}-debug-str"
-set args "--dump-section .debug_str=debug_str_section $binfile"
+set args "--dump-section .debug_str=${debug_str_section} $binfile"
 set result [remote_exec host "[gdb_find_objcopy] $args"]
 set status [lindex $result 0]
 set output [lindex $result 1]