ChangeLog:

* remote.h (remote_filename_p, remote_bfd_open): Add prototypes.
	* remote.c (remote_bfd_iovec_open, remote_bfd_iovec_close,
	remote_bfd_iovec_pread, remote_bfd_iovec_stat, remote_filename_p,
	remote_bfd_open): New functions.
	(remote_hostio_send_command): Fail safely if remote connection
	is not set up.

	* solist.h (solib_open): Remove prototype.
	(solib_bfd_open): Add prototype.
	* solib.c: Include "remote.h".
	(solib_open): Remove, replace by ...
	(solib_bfd_open): ... this new function.  Handle remote BFDs.
	(solib_map_sections): Replace solib_open by solib_bfd_open.
	* solib-frv.c: Include "exceptions.h".
	(enable_break2): Replace solib_open by solib_bfd_open.
	* solib-svr4.c: Include "exceptions.h".
	(enable_break): Replace solib_open by solib_bfd_open.

	* symfile.c: Include "remote.h".
	(build_id_verify): Handle remote BFDs.
	(separate_debug_file_exists): Use BFD to access file.  Handle
	remote BFDs.
	(symfile_bfd_open): Handle remote BFDs.
	(reread_symbols): Handle remote BFDs.

	* NEWS: Mention "remote:" argument prefix to "set sysroot".

doc/ChangeLog:

	* gdb.texinfo (Commands to Specify Files): Document "remote:"
	argument prefix to "set sysroot".

gdb/solib.c

@@ -44,6 +44,7 @@
 #include "solist.h"
 #include "observer.h"
 #include "readline/readline.h"
+#include "remote.h"
 
 /* Architecture-specific operations.  */
 
@@ -106,11 +107,11 @@ The search path for loading non-absolute shared library symbol files is %s.\n"),
 
    GLOBAL FUNCTION
 
-   solib_open -- Find a shared library file and open it.
+   solib_bfd_open -- Find a shared library file and open BFD for it.
 
    SYNOPSIS
 
-   int solib_open (char *in_patname, char **found_pathname);
+   struct bfd *solib_open (char *in_pathname);
 
    DESCRIPTION
 
@@ -137,16 +138,17 @@ The search path for loading non-absolute shared library symbol files is %s.\n"),
 
    RETURNS
 
-   file handle for opened solib, or -1 for failure.  */
+   BFD file handle for opened solib; throws error on failure.  */
 
-int
-solib_open (char *in_pathname, char **found_pathname)
+bfd *
+solib_bfd_open (char *in_pathname)
 {
   struct target_so_ops *ops = solib_ops (target_gdbarch);
   int found_file = -1;
   char *temp_pathname = NULL;
   char *p = in_pathname;
   int gdb_sysroot_is_empty;
+  bfd *abfd;
 
   gdb_sysroot_is_empty = (gdb_sysroot == NULL || *gdb_sysroot == 0);
 
@@ -168,6 +170,29 @@ solib_open (char *in_pathname, char **found_pathname)
       strcat (temp_pathname, in_pathname);
     }
 
+  /* Handle remote files.  */
+  if (remote_filename_p (temp_pathname))
+    {
+      temp_pathname = xstrdup (temp_pathname);
+      abfd = remote_bfd_open (temp_pathname, gnutarget);
+      if (!abfd)
+	{
+	  make_cleanup (xfree, temp_pathname);
+	  error (_("Could not open `%s' as an executable file: %s"),
+		 temp_pathname, bfd_errmsg (bfd_get_error ()));
+	}
+
+      if (!bfd_check_format (abfd, bfd_object))
+	{
+	  bfd_close (abfd);
+	  make_cleanup (xfree, temp_pathname);
+	  error (_("`%s': not in executable format: %s"),
+		 temp_pathname, bfd_errmsg (bfd_get_error ()));
+	}
+
+      return abfd;
+    }
+
   /* Now see if we can open it.  */
   found_file = open (temp_pathname, O_RDONLY | O_BINARY, 0);
 
@@ -228,16 +253,30 @@ solib_open (char *in_pathname, char **found_pathname)
 			OPF_TRY_CWD_FIRST, in_pathname, O_RDONLY | O_BINARY, 0,
 			&temp_pathname);
 
-  /* Done.  If not found, tough luck.  Return found_file and 
-     (optionally) found_pathname.  */
-  if (temp_pathname)
+  /* Done.  If still not found, error.  */
+  if (found_file < 0)
+    perror_with_name (in_pathname);
+
+  /* Leave temp_pathname allocated.  abfd->name will point to it.  */
+  abfd = bfd_fopen (temp_pathname, gnutarget, FOPEN_RB, found_file);
+  if (!abfd)
     {
-      if (found_pathname != NULL)
-	*found_pathname = temp_pathname;
-      else
-	xfree (temp_pathname);
+      close (found_file);
+      make_cleanup (xfree, temp_pathname);
+      error (_("Could not open `%s' as an executable file: %s"),
+	     temp_pathname, bfd_errmsg (bfd_get_error ()));
     }
-  return found_file;
+
+  if (!bfd_check_format (abfd, bfd_object))
+    {
+      bfd_close (abfd);
+      make_cleanup (xfree, temp_pathname);
+      error (_("`%s': not in executable format: %s"),
+	     temp_pathname, bfd_errmsg (bfd_get_error ()));
+    }
+
+  bfd_set_cacheable (abfd, 1);
+  return abfd;
 }
 
 
@@ -273,46 +312,24 @@ solib_map_sections (void *arg)
 {
   struct so_list *so = (struct so_list *) arg;	/* catch_errors bogon */
   char *filename;
-  char *scratch_pathname;
-  int scratch_chan;
   struct section_table *p;
   struct cleanup *old_chain;
   bfd *abfd;
 
   filename = tilde_expand (so->so_name);
-
   old_chain = make_cleanup (xfree, filename);
-  scratch_chan = solib_open (filename, &scratch_pathname);
-
-  if (scratch_chan < 0)
-    {
-      perror_with_name (filename);
-    }
-
-  /* Leave scratch_pathname allocated.  abfd->name will point to it.  */
-  abfd = bfd_fopen (scratch_pathname, gnutarget, FOPEN_RB, scratch_chan);
-  if (!abfd)
-    {
-      close (scratch_chan);
-      error (_("Could not open `%s' as an executable file: %s"),
-	     scratch_pathname, bfd_errmsg (bfd_get_error ()));
-    }
+  abfd = solib_bfd_open (filename);
+  do_cleanups (old_chain);
 
   /* Leave bfd open, core_xfer_memory and "info files" need it.  */
   so->abfd = abfd;
-  bfd_set_cacheable (abfd, 1);
 
   /* copy full path name into so_name, so that later symbol_file_add
      can find it */
-  if (strlen (scratch_pathname) >= SO_NAME_MAX_PATH_SIZE)
-    error (_("Full path name length of shared library exceeds SO_NAME_MAX_PATH_SIZE in so_list structure."));
-  strcpy (so->so_name, scratch_pathname);
+  if (strlen (bfd_get_filename (abfd)) >= SO_NAME_MAX_PATH_SIZE)
+    error (_("Shared library file name is too long."));
+  strcpy (so->so_name, bfd_get_filename (abfd));
 
-  if (!bfd_check_format (abfd, bfd_object))
-    {
-      error (_("\"%s\": not in executable format: %s."),
-	     scratch_pathname, bfd_errmsg (bfd_get_error ()));
-    }
   if (build_section_table (abfd, &so->sections, &so->sections_end))
     {
       error (_("Can't find the file sections in `%s': %s"),
@@ -339,9 +356,6 @@ solib_map_sections (void *arg)
 	}
     }
 
-  /* Free the file names, close the file now.  */
-  do_cleanups (old_chain);
-
   return (1);
 }