[pushed] gdb.base/dso2dso.exp sometimes broken

[Joel Brobecker <brobecker@adacore.com>]

From: Keith Seitz <keiths@redhat.com>

Hello,

Keith reported that gdb.base/dso2dso.exp is broken, with the following
error:

| $ make check RUNTESTFLAGS=dso2dso.exp
| [snip]
| Running ../../../src/gdb/testsuite/gdb.base/dso2dso.exp ...
| ERROR: tcl error sourcing ../../../src/gdb/testsuite/gdb.base/dso2dso.exp.
| ERROR: couldn't open
| "../../../src/gdb/testsuite/gdb.base/../../../src/gdb/testsuite/gdb.base/dso2dso-dso1.c":
| no such file or directory
|     while executing
| "error "$message""
|     (procedure "gdb_get_line_number" line 14)
|     invoked from within
| "gdb_get_line_number "STOP HERE" $srcfile_libdso1"
|     (file "../../../src/gdb/testsuite/gdb.base/dso2dso.exp" line 60)
|     invoked from within
| "source ../../../src/gdb/testsuite/gdb.base/dso2dso.exp"
|     ("uplevel" body line 1)
|     invoked from within
| "uplevel #0 source ../../../src/gdb/testsuite/gdb.base/dso2dso.exp"
|     invoked from within
| "catch "uplevel #0 source $test_file_name""

This happens because gdb_get_line_number will prepend $srcdir/$subdir
if the given filename does not start with "/", and this happens when
GDB was configured using a relative path to the configure script.
When using an absolute path like I do, we avoid the pre-pending that
Keith is seeing.

gdb/testsuite/ChangeLog:

        Keith Seitz  <keiths@redhat.com>:
        * gdb.base/dso2dso.exp: Pass basename of source file in call
        to gdb_get_line_number.

Tested on x86_64-linux with both scenarios.
Pushing now...

Thanks Keith!
-- 
Joel

---
 gdb/testsuite/ChangeLog            | 5 +++++
 gdb/testsuite/gdb.base/dso2dso.exp | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 738c927..b44869d 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2015-08-12  Keith Seitz  <keiths@redhat.com>
+
+	* gdb.base/dso2dso.exp: Pass basename of source file in call to
+	gdb_get_line_number.
+
 2015-08-12  Joel Brobecker  <brobecker@adacore.com>
 
 	* gdb.base/dso2dso-dso2.c, gdb.base/dso2dso-dso2.h,
diff --git a/gdb/testsuite/gdb.base/dso2dso.exp b/gdb/testsuite/gdb.base/dso2dso.exp
index 16eb1f3..c1873ba 100644
--- a/gdb/testsuite/gdb.base/dso2dso.exp
+++ b/gdb/testsuite/gdb.base/dso2dso.exp
@@ -63,7 +63,7 @@ if { ![runto_main] } {
   return -1
 }
 
-set bp_location [gdb_get_line_number "STOP HERE" $srcfile_libdso1]
+set bp_location [gdb_get_line_number "STOP HERE" [file tail $srcfile_libdso1]]
 gdb_breakpoint ${srcfile_libdso1}:${bp_location}
 
 gdb_continue_to_breakpoint "at call to sub2" \
-- 
2.1.4