# if HAVE_UNISTD_H
# include <unistd.h>
# endif
+# undef __need_getopt
# undef getopt
# undef getopt_long
# undef getopt_long_only
# undef opterr
# undef optind
# undef optopt
-# define getopt __GETOPT_PREFIX##getopt
-# define getopt_long __GETOPT_PREFIX##getopt_long
-# define getopt_long_only __GETOPT_PREFIX##getopt_long_only
-# define optarg __GETOPT_PREFIX##optarg
-# define opterr __GETOPT_PREFIX##opterr
-# define optind __GETOPT_PREFIX##optind
-# define optopt __GETOPT_PREFIX##optopt
+# define __GETOPT_CONCAT(x, y) x ## y
+# define __GETOPT_XCONCAT(x, y) __GETOPT_CONCAT (x, y)
+# define __GETOPT_ID(y) __GETOPT_XCONCAT (__GETOPT_PREFIX, y)
+# define getopt __GETOPT_ID (getopt)
+# define getopt_long __GETOPT_ID (getopt_long)
+# define getopt_long_only __GETOPT_ID (getopt_long_only)
+# define optarg __GETOPT_ID (optarg)
+# define opterr __GETOPT_ID (opterr)
+# define optind __GETOPT_ID (optind)
+# define optopt __GETOPT_ID (optopt)
+#endif
+
+/* Standalone applications get correct prototypes for getopt_long and
+ getopt_long_only; they declare "char **argv". libc uses prototypes
+ with "char *const *argv" that are incorrect because getopt_long and
+ getopt_long_only can permute argv; this is required for backward
+ compatibility (e.g., for LSB 2.0.1).
+
+ This used to be `#if defined __GETOPT_PREFIX && !defined __need_getopt',
+ but it caused redefinition warnings if both unistd.h and getopt.h were
+ included, since unistd.h includes getopt.h having previously defined
+ __need_getopt.
+
+ The only place where __getopt_argv_const is used is in definitions
+ of getopt_long and getopt_long_only below, but these are visible
+ only if __need_getopt is not defined, so it is quite safe to rewrite
+ the conditional as follows:
+*/
+#if !defined __need_getopt
+# if defined __GETOPT_PREFIX
+# define __getopt_argv_const /* empty */
+# else
+# define __getopt_argv_const const
+# endif
#endif
/* If __GNU_LIBRARY__ is not already defined, either we are being used
__THROW;
#ifndef __need_getopt
-extern int getopt_long (int ___argc, char **___argv,
+extern int getopt_long (int ___argc, char *__getopt_argv_const *___argv,
const char *__shortopts,
const struct option *__longopts, int *__longind)
__THROW;
-extern int getopt_long_only (int ___argc, char **___argv,
+extern int getopt_long_only (int ___argc, char *__getopt_argv_const *___argv,
const char *__shortopts,
const struct option *__longopts, int *__longind)
__THROW;