guile: Add as_a_scm_t_subr

Building GDB in C++ mode on Fedora 20, the gdb/guile/ code shows ~280
errors like:

 src/gdb/guile/guile.c:515:1: error: invalid conversion from ‘scm_unused_struct* (*)(SCM, SCM) {aka scm_unused_struct* (*)(scm_unused_struct*, scm_unused_struct*)}’ to ‘scm_t_subr {aka void*}’ [-fpermissive]

This commit fixes them all.

gdb/ChangeLog:
2015-09-07  Pedro Alves  <palves@redhat.com>

	* guile/guile-internal.h (as_a_scm_t_subr): New.
	* guile/guile.c (misc_guile_functions): Use it.
	* guile/scm-arch.c (arch_functions): Use it.
	* guile/scm-block.c (block_functions, gdbscm_initialize_blocks):
	Use it.
	* guile/scm-breakpoint.c (breakpoint_functions): Use it.
	* guile/scm-cmd.c (command_functions): Use it.
	* guile/scm-disasm.c (disasm_functions): Use it.
	* guile/scm-exception.c (exception_functions)
	(private_exception_functions): Use it.
	* guile/scm-frame.c (frame_functions)
	* guile/scm-gsmob.c (gsmob_functions): Use it.
	* guile/scm-iterator.c (iterator_functions): Use it.
	* guile/scm-lazy-string.c (lazy_string_functions): Use it.
	* guile/scm-math.c (math_functions): Use it.
	* guile/scm-objfile.c (objfile_functions): Use it.
	* guile/scm-param.c (parameter_functions): Use it.
	* guile/scm-ports.c (port_functions, private_port_functions): Use
	it.
	* guile/scm-pretty-print.c (pretty_printer_functions): Use it.
	* guile/scm-progspace.c (pspace_functions): Use it.
	* guile/scm-string.c (string_functions): Use it.
	* guile/scm-symbol.c (symbol_functions): Use it.
	* guile/scm-symtab.c (symtab_functions): Use it.
	* guile/scm-type.c (type_functions, gdbscm_initialize_types): Use
	it.
	* guile/scm-value.c (value_functions): Use it.

1 files changed, 9 insertions, 8 deletions

diff --git a/gdb/guile/scm-objfile.c b/gdb/guile/scm-objfile.c
index 080b90539e..0af151db20 100644
--- a/gdb/guile/scm-objfile.c
+++ b/gdb/guile/scm-objfile.c
@@ -389,36 +389,37 @@ gdbscm_objfiles (void)
 
 static const scheme_function objfile_functions[] =
 {
-  { "objfile?", 1, 0, 0, gdbscm_objfile_p,
+  { "objfile?", 1, 0, 0, as_a_scm_t_subr (gdbscm_objfile_p),
     "\
 Return #t if the object is a <gdb:objfile> object." },
 
-  { "objfile-valid?", 1, 0, 0, gdbscm_objfile_valid_p,
+  { "objfile-valid?", 1, 0, 0, as_a_scm_t_subr (gdbscm_objfile_valid_p),
     "\
 Return #t if the objfile is valid (hasn't been deleted from gdb)." },
 
-  { "objfile-filename", 1, 0, 0, gdbscm_objfile_filename,
+  { "objfile-filename", 1, 0, 0, as_a_scm_t_subr (gdbscm_objfile_filename),
     "\
 Return the file name of the objfile." },
 
-  { "objfile-progspace", 1, 0, 0, gdbscm_objfile_progspace,
+  { "objfile-progspace", 1, 0, 0, as_a_scm_t_subr (gdbscm_objfile_progspace),
     "\
 Return the progspace that the objfile lives in." },
 
-  { "objfile-pretty-printers", 1, 0, 0, gdbscm_objfile_pretty_printers,
+  { "objfile-pretty-printers", 1, 0, 0,
+    as_a_scm_t_subr (gdbscm_objfile_pretty_printers),
     "\
 Return a list of pretty-printers of the objfile." },
 
   { "set-objfile-pretty-printers!", 2, 0, 0,
-    gdbscm_set_objfile_pretty_printers_x,
+    as_a_scm_t_subr (gdbscm_set_objfile_pretty_printers_x),
     "\
 Set the list of pretty-printers of the objfile." },
 
-  { "current-objfile", 0, 0, 0, gdbscm_get_current_objfile,
+  { "current-objfile", 0, 0, 0, as_a_scm_t_subr (gdbscm_get_current_objfile),
     "\
 Return the current objfile if there is one or #f if there isn't one." },
 
-  { "objfiles", 0, 0, 0, gdbscm_objfiles,
+  { "objfiles", 0, 0, 0, as_a_scm_t_subr (gdbscm_objfiles),
     "\
 Return a list of all objfiles in the current program space." },