+// Check varargs and va_copy.
+static void
+test_varargs (const char *format, ...)
+{
+ va_list args;
+ va_start (args, format);
+ va_list args_copy;
+ va_copy (args_copy, args);
+
+ const char *str;
+ int number;
+ float fnumber;
+
+ while (*format)
+ {
+ switch (*format++)
+ {
+ case 's': // string
+ str = va_arg (args_copy, const char *);
+ break;
+ case 'd': // int
+ number = va_arg (args_copy, int);
+ break;
+ case 'f': // float
+ fnumber = va_arg (args_copy, double);
+ break;
+ default:
+ break;
+ }
+ }
+ va_end (args_copy);
+ va_end (args);
+}
+
+int
+main ()
+{
+
+ // Check bool.
+ _Bool success = false;
+
+ // Check restrict.
+ if (test_restrict ("String literal") == 0)
+ success = true;
+ char *restrict newvar = "Another string";
+
+ // Check varargs.
+ test_varargs ("s, d' f .", "string", 65, 34.234);
+ test_varargs_macros ();
+
+ // Check flexible array members.
+ struct incomplete_array *ia =
+ malloc (sizeof (struct incomplete_array) + (sizeof (double) * 10));
+ ia->datasize = 10;
+ for (int i = 0; i < ia->datasize; ++i)
+ ia->data[i] = i * 1.234;
+
+ // Check named initializers.
+ struct named_init ni = {
+ .number = 34,
+ .name = L"Test wide string",
+ .average = 543.34343,
+ };
+
+ ni.number = 58;
+
+ int dynamic_array[ni.number];
+ dynamic_array[ni.number - 1] = 543;
+
+ // work around unused variable warnings
+ return (!success || bignum == 0LL || ubignum == 0uLL || newvar[0] == 'x'
+ || dynamic_array[ni.number - 1] != 543);
+
+ ;
+ return 0;
+}
+_ACEOF
+for ac_arg in '' -std=gnu99 -std=c99 -c99 -AC99 -xc99=all -qlanglvl=extc99
+do
+ CC="$ac_save_CC $ac_arg"
+ if ac_fn_c_try_compile "$LINENO"; then :
+ ac_cv_prog_cc_c99=$ac_arg
+fi
+rm -f core conftest.err conftest.$ac_objext
+ test "x$ac_cv_prog_cc_c99" != "xno" && break
+done
+rm -f conftest.$ac_ext
+CC=$ac_save_CC
+
+fi
+# AC_CACHE_VAL
+case "x$ac_cv_prog_cc_c99" in
+ x)
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
+$as_echo "none needed" >&6; } ;;
+ xno)
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
+$as_echo "unsupported" >&6; } ;;
+ *)
+ CC="$CC $ac_cv_prog_cc_c99"
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_c99" >&5
+$as_echo "$ac_cv_prog_cc_c99" >&6; } ;;
+esac
+if test "x$ac_cv_prog_cc_c99" != xno; then :
+ ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c99
+else
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $CC option to accept ISO C89" >&5
+$as_echo_n "checking for $CC option to accept ISO C89... " >&6; }
+if test "${ac_cv_prog_cc_c89+set}" = set; then :
+ $as_echo_n "(cached) " >&6
+else
+ ac_cv_prog_cc_c89=no
+ac_save_CC=$CC
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+#include <stdarg.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+/* Most of the following tests are stolen from RCS 5.7's src/conf.sh. */
+struct buf { int x; };
+FILE * (*rcsopen) (struct buf *, struct stat *, int);
+static char *e (p, i)
+ char **p;
+ int i;
+{
+ return p[i];
+}
+static char *f (char * (*g) (char **, int), char **p, ...)
+{
+ char *s;
+ va_list v;
+ va_start (v,p);
+ s = g (p, va_arg (v,int));
+ va_end (v);
+ return s;
+}
+
+/* OSF 4.0 Compaq cc is some sort of almost-ANSI by default. It has
+ function prototypes and stuff, but not '\xHH' hex character constants.
+ These don't provoke an error unfortunately, instead are silently treated
+ as 'x'. The following induces an error, until -std is added to get
+ proper ANSI mode. Curiously '\x00'!='x' always comes out true, for an
+ array size at least. It's necessary to write '\x00'==0 to get something
+ that's true only with -std. */
+int osf4_cc_array ['\x00' == 0 ? 1 : -1];
+
+/* IBM C 6 for AIX is almost-ANSI by default, but it replaces macro parameters
+ inside strings and character constants. */
+#define FOO(x) 'x'
+int xlc6_cc_array[FOO(a) == 'x' ? 1 : -1];
+
+int test (int i, double x);
+struct s1 {int (*f) (int a);};
+struct s2 {int (*f) (double a);};
+int pairnames (int, char **, FILE *(*)(struct buf *, struct stat *, int), int, int);
+int argc;
+char **argv;
+int
+main ()
+{
+return f (e, argv, 0) != argv[0] || f (e, argv, 1) != argv[1];
+ ;
+ return 0;
+}
+_ACEOF
+for ac_arg in '' -qlanglvl=extc89 -qlanglvl=ansi -std \
+ -Ae "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"
+do
+ CC="$ac_save_CC $ac_arg"
+ if ac_fn_c_try_compile "$LINENO"; then :
+ ac_cv_prog_cc_c89=$ac_arg
+fi
+rm -f core conftest.err conftest.$ac_objext
+ test "x$ac_cv_prog_cc_c89" != "xno" && break
+done
+rm -f conftest.$ac_ext
+CC=$ac_save_CC
+
+fi
+# AC_CACHE_VAL
+case "x$ac_cv_prog_cc_c89" in
+ x)
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
+$as_echo "none needed" >&6; } ;;
+ xno)
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
+$as_echo "unsupported" >&6; } ;;
+ *)
+ CC="$CC $ac_cv_prog_cc_c89"
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_c89" >&5
+$as_echo "$ac_cv_prog_cc_c89" >&6; } ;;
+esac
+if test "x$ac_cv_prog_cc_c89" != xno; then :
+ ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c89
+else
+ ac_cv_prog_cc_stdc=no
+fi
+
+fi
+ ;;
+esac
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $CC option to accept ISO Standard C" >&5
+$as_echo_n "checking for $CC option to accept ISO Standard C... " >&6; }
+ if test "${ac_cv_prog_cc_stdc+set}" = set; then :
+ $as_echo_n "(cached) " >&6
+fi
+
+ case $ac_cv_prog_cc_stdc in #(
+ no) :
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
+$as_echo "unsupported" >&6; } ;; #(
+ '') :
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
+$as_echo "none needed" >&6; } ;; #(
+ *) :
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_stdc" >&5
+$as_echo "$ac_cv_prog_cc_stdc" >&6; } ;;
+esac
+
+
+
+ # Code from module alloca-opt:
+ # Code from module allocator:
+ # Code from module arg-nonnull:
+ # Code from module c++defs:
+ # Code from module careadlinkat:
+ # Code from module crypto/md5:
+ # Code from module crypto/sha1:
+ # Code from module crypto/sha256:
+ # Code from module crypto/sha512:
+ # Code from module dosname:
+ # Code from module dtoastr:
+ # Code from module extensions:
+
+ # Code from module filemode:
+ # Code from module getloadavg:
+ # Code from module getopt-gnu:
+ # Code from module getopt-posix:
+ # Code from module gettext-h:
+ # Code from module ignore-value:
+ # Code from module include_next:
+ # Code from module intprops:
+ # Code from module inttypes-incomplete:
+ # Code from module lstat:
+ # Code from module mktime:
+ # Code from module multiarch:
+ # Code from module readlink:
+ # Code from module socklen:
+ # Code from module ssize_t:
+ # Code from module stat:
+ # Code from module stdarg:
+
+ # Code from module stdbool:
+ # Code from module stddef:
+ # Code from module stdint:
+ # Code from module stdio:
+ # Code from module stdlib:
+ # Code from module strftime:
+ # Code from module strtoull:
+ # Code from module strtoumax:
+ # Code from module symlink:
+ # Code from module sys_stat:
+ # Code from module time:
+ # Code from module time_r:
+ # Code from module u64:
+ # Code from module unistd:
+ # Code from module verify:
+ # Code from module warn-on-use:
+
+
+# On Suns, sometimes $CPP names a directory.
+if test -n "$CPP" && test -d "$CPP"; then
+ CPP=
+fi
+
+## If not using gcc, and on Solaris, and no CPP specified, see if
+## using a Sun compiler, which needs -Xs to prevent whitespace.
+if test x"$GCC" != xyes && test x"$emacs_check_sunpro_c" = xyes && \
+ test x"$CPP" = x; then
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we are using a Sun C compiler" >&5
+$as_echo_n "checking whether we are using a Sun C compiler... " >&6; }
+ if test "${emacs_cv_sunpro_c+set}" = set; then :
+ $as_echo_n "(cached) " >&6
+else
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+int
+main ()