Improve gdb_remote_download, remove gdb_download

This patch removes gdb_download in favor of gdb_remote_download, since
they are very close in functionality.  Also, in preparation for the
following patch about shared library handling during tests, it improves
gdb_remote_download so that it uses standard_output_file for any
destination board that is local, not only host.

If the destination board is remote, gdb_remote_download will use the
standard remote_download from DejaGnu, resulting in the file being
transferred on the remote system.

If the destination is local, gdb_remote_download will copy the file to
the standard test directory (found using standard_output_file).  Tcl's
file copy seems to handle gracefully cases where the source file is the
same as the destination, so I don't think it's necessary to check for
that case ourselves, as a previous version of the patch did.

I'd prefer to keep the name gdb_download instead of gdb_remote_download,
since I don't like the fact that gdb_remote_download implies that the
destination is remote, when it's not always the case.  However,
gdb_remote_download is used at many more places than gdb_download, so
it's easier to reuse that.  Also, since it's a wrapper around DejaGnu's
remote_download, it might be better to keep that name.  I don't know.

I ran the testsuite native, with native-gdbserver and with a
remote gdbserver, and didn't see any related failure.

gdb/testsuite/ChangeLog:

	* gdb.base/jit-so.exp: Use gdb_remote_download instead of
	gdb_download.  Use it even if the target is not remote.
	* gdb.base/jit.exp (compile_jit_test): Likewise.
	* lib/gdb.exp (gdb_remote_download): Copy files to the standard
	output directory if the destination board is local, otherwise use
	the standard remote_download from DejaGnu.
	(gdb_download): Remove.
	(gdb_load_shlibs): Use gdb_remote_download instead of
	gdb_download.
	* lib/gdbserver-support.exp (gdbserver_download_current_prog):
	Use gdb_remote_download instead of gdb_download.  Use it even if
	the target is not remote.
	* lib/mi-support.exp (mi_load_shlibs): Use gdb_remote_download
	instead of gdb_download.

gdb/testsuite/ChangeLog

@@ -1,3 +1,20 @@
+2016-04-05  Simon Marchi  <simon.marchi@ericsson.com>
+
+	* gdb.base/jit-so.exp: Use gdb_remote_download instead of
+	gdb_download.  Use it even if the target is not remote.
+	* gdb.base/jit.exp (compile_jit_test): Likewise.
+	* lib/gdb.exp (gdb_remote_download): Copy files to the standard
+	output directory if the destination board is local, otherwise use
+	the standard remote_download from DejaGnu.
+	(gdb_download): Remove.
+	(gdb_load_shlibs): Use gdb_remote_download instead of
+	gdb_download.
+	* lib/gdbserver-support.exp (gdbserver_download_current_prog):
+	Use gdb_remote_download instead of gdb_download.  Use it even if
+	the target is not remote.
+	* lib/mi-support.exp (mi_load_shlibs): Use gdb_remote_download
+	instead of gdb_download.
+
 2016-04-04  Simon Marchi  <simon.marchi@polymtl.ca>
 
 	* gdb.mi/mi-breakpoint-changed.exp: Add some with_test_prefix.

gdb/testsuite/gdb.base/jit-so.exp

@@ -61,11 +61,7 @@ if { [gdb_compile_shlib ${solib_srcfile} ${solib_binfile} {}] != "" } {
     return -1
 }
 
-if {[is_remote target]} {
-    set solib_binfile_target [gdb_download ${solib_binfile}]
-} else {
-    set solib_binfile_target $solib_binfile
-}
+set solib_binfile_target [gdb_remote_download target ${solib_binfile}]
 
 proc one_jit_test {count match_str} {
     with_test_prefix "one_jit_test-$count" {

gdb/testsuite/gdb.base/jit.exp

@@ -57,11 +57,7 @@ proc compile_jit_test {testname binsuffix options} {
 	return -1
     }
 
-    if {[is_remote target]} {
-	set solib_binfile_target [gdb_download ${solib_binfile}]
-    } else {
-	set solib_binfile_target $solib_binfile
-    }
+    set solib_binfile_target [gdb_remote_download target ${solib_binfile}]
 
     return 0
 }

gdb/testsuite/lib/gdb.exp

@@ -4183,36 +4183,44 @@ proc gdb_touch_execfile { binfile } {
     }
 }
 
-# Like remote_download but provides a gdb-specific behavior.  If DEST
-# is "host", and the host is not remote, and TOFILE is not specified,
-# then the [file tail] of FROMFILE is passed through
-# standard_output_file to compute the destination.
+# Like remote_download but provides a gdb-specific behavior.
+#
+# If the destination board is remote, the local file FROMFILE is transferred as
+# usual with remote_download to TOFILE on the remote board.  The destination
+# filename is added to the CLEANFILES global, so it can be cleaned up at the
+# end of the test.
+#
+# If the destination board is local, the destination path TOFILE is passed
+# through standard_output_file, and FROMFILE is copied there.
+#
+# In both cases, if TOFILE is omitted, it defaults to the [file tail] of
+# FROMFILE.
 
 proc gdb_remote_download {dest fromfile {tofile {}}} {
-    if {$dest == "host" && ![is_remote host] && $tofile == ""} {
-	set tofile [standard_output_file [file tail $fromfile]]
+    # If TOFILE is not given, default to the same filename as FROMFILE.
+    if {[string length $tofile] == 0} {
+	set tofile [file tail $fromfile]
     }
 
-    if { $tofile == "" } {
-	return [remote_download $dest $fromfile]
+    if {[is_remote $dest]} {
+	# When the DEST is remote, we simply send the file to DEST.
+	global cleanfiles
+
+	set destname [remote_download $dest $fromfile $tofile]
+	lappend cleanfiles $destname
+
+	return $destname
     } else {
-	return [remote_download $dest $fromfile $tofile]
+	# When the DEST is local, we copy the file to the test directory
+	# (where the executable is), except if that's already where it is.
+	set tofile [standard_output_file $tofile]
+
+	file copy -force $fromfile $tofile
+
+	return $tofile
     }
 }
 
-# gdb_download
-#
-# Copy a file to the remote target and return its target filename.
-# Schedule the file to be deleted at the end of this test.
-
-proc gdb_download { filename } {
-    global cleanfiles
-
-    set destname [remote_download target $filename]
-    lappend cleanfiles $destname
-    return $destname
-}
-
 # gdb_load_shlibs LIB...
 #
 # Copy the listed libraries to the target.
@@ -4223,7 +4231,7 @@ proc gdb_load_shlibs { args } {
     }
 
     foreach file $args {
-	gdb_download [shlib_target_file $file]
+	gdb_remote_download target [shlib_target_file $file]
     }
 
     # Even if the target supplies full paths for shared libraries,

gdb/testsuite/lib/gdbserver-support.exp

@@ -176,11 +176,7 @@ proc gdbserver_download_current_prog { } {
     if { $reuse == 0 } {
 	set gdbserver_host_exec $host_exec
 	set gdbserver_host_mtime [file mtime $host_exec]
-	if [is_remote target] {
-	    set gdbserver_server_exec [gdb_download $host_exec]
-	} else {
-	    set gdbserver_server_exec $host_exec
-	}
+	set gdbserver_server_exec [gdb_remote_download target $host_exec]
     }
 
     return $gdbserver_server_exec

gdb/testsuite/lib/mi-support.exp

@@ -1960,7 +1960,7 @@ proc mi_load_shlibs { args } {
     }
 
     foreach file $args {
-	gdb_download [shlib_target_file $file]
+	gdb_remote_download target [shlib_target_file $file]
     }
 
     # Even if the target supplies full paths for shared libraries,