sim, sim/{m32c,ppc,rl78}: Use getopt_long

Because of a Libiberty hack, getopt on GNU libc (2.25 or earlier) is
currently unusable on sim, causing a regression on CentOS 7.

This is caused as follows:

1.  If HAVE_DECL_GETOPT is defined (getopt declaration with known prototype
    is detected while configuration), a declaration of getopt in
    "include/getopt.h" is suppressed.
    The author started to define HAVE_DECL_GETOPT in sim with the commit
    340aa4f6872c ("sim: Check known getopt definition existence").
2.  GNU libc (2.25 or earlier)'s <unistd.h> includes <getopt.h> with a
    special purpose macro defined to declare only getopt function but due
    to include path (not tested while configuration), it causes <unistd.h>
    to include Libiberty's "include/getopt.h".
3.  If both 1. and 2. are satisfied, despite that <unistd.h> tries to
    declare getopt by including <getopt.h>, "include/getopt.h" does not do
    so, causing getopt function undeclared.

Getting rid of "include/getopt.h" (e.g. renaming this header file) is the
best solution to avoid hacking but as a short-term solution, this commit
replaces getopt with getopt_long under sim/.

1 files changed, 3 insertions, 1 deletions

diff --git a/sim/rl78/main.c b/sim/rl78/main.c
index c9459c7..ea6ddaa 100644
--- a/sim/rl78/main.c
+++ b/sim/rl78/main.c
@@ -64,10 +64,12 @@ main (int argc, char **argv)
   int save_trace;
   bfd *prog;
   int rc;
+  static const struct option longopts[] = { { 0 } };
 
   xmalloc_set_program_name (argv[0]);
 
-  while ((o = getopt (argc, argv, "tvdr:D:M:")) != -1)
+  while ((o = getopt_long (argc, argv, "tvdr:D:M:", longopts, NULL))
+	 != -1)
     {
       switch (o)
 	{