[PATCH] Make host_address_to_string/gdb_print_host_address cast parameter to 'void *'

[Pedro Alves <palves@redhat.com>]

Fixes a set of errors like:

 ../../src/gdb/symfile-debug.c: In function ‘int debug_qf_map_symtabs_matching_filename(objfile*, const char*, const char*, int (*)(symtab*, void*), void*)’:
 ../../src/gdb/symfile-debug.c:137:39: error: invalid conversion from ‘int (*)(symtab*, void*)’ to ‘const void*’ [-fpermissive]
	host_address_to_string (callback),
					^

Note this has to work with data and function pointers.  In C++11 we
may perhaps do something a bit safer, but we're not there yet, and I
don't think it really matters.  For now just always do a simple
C-style cast in host_address_to_string itself.  No point in adding a
void * cast to each and every caller.

gdb/ChangeLog:
2015-10-27  Pedro Alves  <palves@redhat.com>

	* common/print-utils.c (host_address_to_string): Undef.
	* common/print-utils.h (host_address_to_string): Add a wrapper
	macro around the host_address_to_string function.
	* utils.c ():
	* utils.c (gdb_print_host_address): Undef.
	* utils.h (gdb_print_host_address): Add a wrapper macro around the
	host_address_to_string function.
---
 gdb/common/print-utils.c | 2 ++
 gdb/common/print-utils.h | 4 ++++
 gdb/utils.c              | 2 ++
 gdb/utils.h              | 4 ++++
 4 files changed, 12 insertions(+)

diff --git a/gdb/common/print-utils.c b/gdb/common/print-utils.c
index 1c1a5c1..bd62503 100644
--- a/gdb/common/print-utils.c
+++ b/gdb/common/print-utils.c
@@ -315,6 +315,8 @@ core_addr_to_string_nz (const CORE_ADDR addr)
 
 /* See print-utils.h.  */
 
+#undef host_address_to_string
+
 const char *
 host_address_to_string (const void *addr)
 {
diff --git a/gdb/common/print-utils.h b/gdb/common/print-utils.h
index 8d16966..abeb003 100644
--- a/gdb/common/print-utils.h
+++ b/gdb/common/print-utils.h
@@ -67,4 +67,8 @@ extern const char *core_addr_to_string_nz (const CORE_ADDR addr);
 
 extern const char *host_address_to_string (const void *addr);
 
+/* Wrapper that avoids adding a pointless cast to all callers.  */
+#define host_address_to_string(ADDR) \
+  host_address_to_string ((const void *) (ADDR))
+
 #endif /* COMMON_CELLS_H */
diff --git a/gdb/utils.c b/gdb/utils.c
index afeff12..101e438 100644
--- a/gdb/utils.c
+++ b/gdb/utils.c
@@ -1103,6 +1103,8 @@ print_spaces (int n, struct ui_file *file)
 
 /* Print a host address.  */
 
+#undef gdb_print_host_address
+
 void
 gdb_print_host_address (const void *addr, struct ui_file *stream)
 {
diff --git a/gdb/utils.h b/gdb/utils.h
index 995a1cf..a226744 100644
--- a/gdb/utils.h
+++ b/gdb/utils.h
@@ -248,6 +248,10 @@ extern int filtered_printing_initialized (void);
 /* Display the host ADDR on STREAM formatted as ``0x%x''.  */
 extern void gdb_print_host_address (const void *addr, struct ui_file *stream);
 
+/* Wrapper that avoids adding a pointless cast to all callers.  */
+#define gdb_print_host_address(ADDR, STREAM) \
+  gdb_print_host_address ((const void *) ADDR, STREAM)
+
 /* Convert CORE_ADDR to string in platform-specific manner.
    This is usually formatted similar to 0x%lx.  */
 extern const char *paddress (struct gdbarch *gdbarch, CORE_ADDR addr);
-- 
1.9.3