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-iterator.c b/gdb/guile/scm-iterator.c
index 46787a2..5a61436 100644
--- a/gdb/guile/scm-iterator.c
+++ b/gdb/guile/scm-iterator.c
@@ -301,7 +301,7 @@ gdbscm_iterator_next_x (SCM self)
 
 static const scheme_function iterator_functions[] =
 {
-  { "make-iterator", 3, 0, 0, gdbscm_make_iterator,
+  { "make-iterator", 3, 0, 0, as_a_scm_t_subr (gdbscm_make_iterator),
     "\
 Create a <gdb:iterator> object.\n\
 \n\
@@ -314,31 +314,32 @@ Create a <gdb:iterator> object.\n\
       By convention end-of-iteration should be marked with (end-of-iteration)\n\
       from module (gdb iterator)." },
 
-  { "iterator?", 1, 0, 0, gdbscm_iterator_p,
+  { "iterator?", 1, 0, 0, as_a_scm_t_subr (gdbscm_iterator_p),
     "\
 Return #t if the object is a <gdb:iterator> object." },
 
-  { "iterator-object", 1, 0, 0, gdbscm_iterator_object,
+  { "iterator-object", 1, 0, 0, as_a_scm_t_subr (gdbscm_iterator_object),
     "\
 Return the object being iterated over." },
 
-  { "iterator-progress", 1, 0, 0, gdbscm_iterator_progress,
+  { "iterator-progress", 1, 0, 0, as_a_scm_t_subr (gdbscm_iterator_progress),
     "\
 Return the progress object of the iterator." },
 
-  { "set-iterator-progress!", 2, 0, 0, gdbscm_set_iterator_progress_x,
+  { "set-iterator-progress!", 2, 0, 0,
+    as_a_scm_t_subr (gdbscm_set_iterator_progress_x),
     "\
 Set the progress object of the iterator." },
 
-  { "iterator-next!", 1, 0, 0, gdbscm_iterator_next_x,
+  { "iterator-next!", 1, 0, 0, as_a_scm_t_subr (gdbscm_iterator_next_x),
     "\
 Invoke the next! procedure of the iterator and return its result." },
 
-  { "end-of-iteration", 0, 0, 0, gdbscm_end_of_iteration,
+  { "end-of-iteration", 0, 0, 0, as_a_scm_t_subr (gdbscm_end_of_iteration),
     "\
 Return the end-of-iteration marker." },
 
-  { "end-of-iteration?", 1, 0, 0, gdbscm_end_of_iteration_p,
+  { "end-of-iteration?", 1, 0, 0, as_a_scm_t_subr (gdbscm_end_of_iteration_p),
     "\
 Return #t if the object is the end-of-iteration marker." },