add casts to avoid arithmetic on void *

arithmetic on void * is undefined in ISO C, so we should avoid it.  In
GNU C sizeof void * is defined as 1, and that is pretty clearly what
this code wants, so change it to do arithmetic on bfd_byte *.
Unfortunately most of the argument types come from virtual function
interfaces so changing the types to bfd_byte * isn't trivial though it
might make the code clearer.  So for the moment its easiest to leave the
variable types as void * and cast before doing arithmetic.

bfd/ChangeLog:

2016-04-26  Trevor Saunders  <tbsaunde+binutils@tbsaunde.org>

	* elf32-rx.c (rx_set_section_contents): Avoid arithmetic on void *.
	* mmo.c (mmo_get_section_contents): Likewise.
	(mmo_set_section_contents): Likewise.

1 files changed, 2 insertions, 2 deletions

diff --git a/bfd/mmo.c b/bfd/mmo.c
index b8af63a711..dbfc9acbb2 100644
--- a/bfd/mmo.c
+++ b/bfd/mmo.c
@@ -2120,7 +2120,7 @@ mmo_get_section_contents (bfd *abfd ATTRIBUTE_UNUSED,
 
       memcpy (location, loc, chunk_size);
 
-      location += chunk_size;
+      location = (bfd_byte *) location + chunk_size;
       bytes_to_do -= chunk_size;
       offset += chunk_size;
     }
@@ -2657,7 +2657,7 @@ mmo_set_section_contents (bfd *abfd ATTRIBUTE_UNUSED, sec_ptr sec,
 
       memcpy (loc, location, chunk_size);
 
-      location += chunk_size;
+      location = (bfd_byte *) location + chunk_size;
       bytes_to_do -= chunk_size;
       offset += chunk_size;
     }