Make the default sysroot be "target:"

This commit makes GDB default to a sysroot of "target:".
One testcase needed updating as a result of this change.

gdb/ChangeLog:

	* main.c (captured_main): Set gdb_sysroot to "target:"
	if not otherwise set.

gdb/testsuite/ChangeLog:

	* gdb.base/break-probes.exp: Cope with "target:" sysroot.

1 files changed, 6 insertions, 0 deletions

diff --git a/gdb/main.c b/gdb/main.c
index 72b8714..8f276b4 100644
--- a/gdb/main.c
+++ b/gdb/main.c
@@ -548,6 +548,12 @@ captured_main (void *data)
   gdb_sysroot = relocate_gdb_directory (TARGET_SYSTEM_ROOT,
 					TARGET_SYSTEM_ROOT_RELOCATABLE);
 
+  if (gdb_sysroot == NULL || *gdb_sysroot == '\0')
+    {
+      xfree (gdb_sysroot);
+      gdb_sysroot = xstrdup (TARGET_SYSROOT_PREFIX);
+    }
+
   debug_file_directory = relocate_gdb_directory (DEBUGDIR,
 						 DEBUGDIR_RELOCATABLE);