@@ -511,7 +511,7 @@ extern void *__argp_input (const struct argp *__restrict __argp,
#ifdef __USE_EXTERN_INLINES
-# if !_LIBC
+# if !(defined _LIBC && _LIBC)
# define __argp_usage argp_usage
# define __argp_state_help argp_state_help
# define __option_is_short _option_is_short
@@ -546,7 +546,7 @@ __NTH (__option_is_end (const struct argp_option *__opt))
return !__opt->key && !__opt->name && !__opt->doc && !__opt->group;
}
-# if !_LIBC
+# if !(defined _LIBC && _LIBC)
# undef __argp_usage
# undef __argp_state_help
# undef __option_is_short
@@ -216,13 +216,13 @@ struct cmsghdr
of cmsghdr structure. */
int cmsg_level; /* Originating protocol. */
int cmsg_type; /* Protocol specific type. */
-#if (!defined __STRICT_ANSI__ && __GNUC__ >= 2) || __STDC_VERSION__ >= 199901L
+#if __glibc_c99_flexarr_available
__extension__ unsigned char __cmsg_data __flexarr; /* Ancillary data. */
#endif
};
/* Ancillary data object manipulation macros. */
-#if (!defined __STRICT_ANSI__ && __GNUC__ >= 2) || __STDC_VERSION__ >= 199901L
+#if __glibc_c99_flexarr_available
# define CMSG_DATA(cmsg) ((cmsg)->__cmsg_data)
#else
# define CMSG_DATA(cmsg) ((unsigned char *) ((struct cmsghdr *) (cmsg) + 1))
@@ -153,21 +153,27 @@
# define __errordecl(name, msg) extern void name (void)
#endif
-/* Support for flexible arrays. */
-#if __GNUC_PREREQ (2,97)
-/* GCC 2.97 supports C99 flexible array members. */
+/* Support for flexible arrays.
+ Headers that should use flexible arrays only if they're "real"
+ (e.g. only if they won't affect sizeof()) should test
+ #if __glibc_c99_flexarr_available. */
+#if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
# define __flexarr []
+# define __glibc_c99_flexarr_available 1
+#elif __GNUC_PREREQ (2,97)
+/* GCC 2.97 supports C99 flexible array members as an extension,
+ even when in C89 mode or compiling C++ (any version). */
+# define __flexarr []
+# define __glibc_c99_flexarr_available 1
+#elif defined __GNUC__
+/* Pre-2.97 GCC did not support C99 flexible arrays but did have
+ an equivalent extension with slightly different notation. */
+# define __flexarr [0]
+# define __glibc_c99_flexarr_available 1
#else
-# ifdef __GNUC__
-# define __flexarr [0]
-# else
-# if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
-# define __flexarr []
-# else
/* Some other non-C99 compiler. Approximate with [1]. */
-# define __flexarr [1]
-# endif
-# endif
+# define __flexarr [1]
+# define __glibc_c99_flexarr_available 0
#endif
@@ -25,7 +25,7 @@ __BEGIN_DECLS
/* We need `size_t' for the following definitions. */
#ifndef __size_t
typedef __SIZE_TYPE__ __size_t;
-# if defined __USE_XOPEN || __USE_XOPEN2K8
+# if defined __USE_XOPEN || defined __USE_XOPEN2K8
typedef __SIZE_TYPE__ size_t;
# endif
#else
@@ -220,13 +220,13 @@ struct cmsghdr
of cmsghdr structure. */
int cmsg_level; /* Originating protocol. */
int cmsg_type; /* Protocol specific type. */
-#if (!defined __STRICT_ANSI__ && __GNUC__ >= 2) || __STDC_VERSION__ >= 199901L
+#if __glibc_c99_flexarr_available
__extension__ unsigned char __cmsg_data __flexarr; /* Ancillary data. */
#endif
};
/* Ancillary data object manipulation macros. */
-#if (!defined __STRICT_ANSI__ && __GNUC__ >= 2) || __STDC_VERSION__ >= 199901L
+#if __glibc_c99_flexarr_available
# define CMSG_DATA(cmsg) ((cmsg)->__cmsg_data)
#else
# define CMSG_DATA(cmsg) ((unsigned char *) ((struct cmsghdr *) (cmsg) + 1))
@@ -273,13 +273,13 @@ struct cmsghdr
with this. */
int cmsg_level; /* Originating protocol. */
int cmsg_type; /* Protocol specific type. */
-#if (!defined __STRICT_ANSI__ && __GNUC__ >= 2) || __STDC_VERSION__ >= 199901L
+#if __glibc_c99_flexarr_available
__extension__ unsigned char __cmsg_data __flexarr; /* Ancillary data. */
#endif
};
/* Ancillary data object manipulation macros. */
-#if (!defined __STRICT_ANSI__ && __GNUC__ >= 2) || __STDC_VERSION__ >= 199901L
+#if __glibc_c99_flexarr_available
# define CMSG_DATA(cmsg) ((cmsg)->__cmsg_data)
#else
# define CMSG_DATA(cmsg) ((unsigned char *) ((struct cmsghdr *) (cmsg) + 1))