# Copyright (C) Igor Sysoev
# Copyright (C) NGINX, Inc.


# C language features.


nxt_feature="C99 variadic macro"
nxt_feature_name=NXT_HAVE_C99_VARIADIC_MACRO
nxt_feature_run=yes
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="#include <stdio.h>
                  #define set(dummy, ...)  sprintf(__VA_ARGS__)

                  int main(void) {
                      char  buf[4];

                      buf[0] = '0';
                      set(0, buf, \"%d\", 1);

                      if (buf[0] == '1')
                          return 0;
                      return 1;
                  }"
. auto/feature


if [ $nxt_found = no ]; then

    nxt_feature="GCC variadic macro"
    nxt_feature_name=NXT_HAVE_GCC_VARIADIC_MACRO
    nxt_feature_run=yes
    nxt_feature_incs=
    nxt_feature_libs=
    nxt_feature_test="#include <stdio.h>
                      #define set(dummy, args...)  sprintf(args)

                      int main(void) {
                          char  buf[4];

                          buf[0] = '0';
                          set(0, buf, \"%d\", 1);

                          if (buf[0] == '1')
                              return 0;
                          return 1;
                      }"
    . auto/feature
fi


nxt_feature="GCC __builtin_expect()"
nxt_feature_name=NXT_HAVE_BUILTIN_EXPECT
nxt_feature_run=no
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="int main(int argc, char *const *argv) {
                      if ((__typeof__(argc == 0))
                                   __builtin_expect((argc == 0), 0))
                          return 0;
                      return 1;
                  }"
. auto/feature


nxt_feature="GCC __builtin_unreachable()"
nxt_feature_name=NXT_HAVE_BUILTIN_UNREACHABLE
nxt_feature_run=no
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="int main(void) {
                      __builtin_unreachable();
                  }"
. auto/feature


nxt_feature="GCC __builtin_prefetch()"
nxt_feature_name=NXT_HAVE_BUILTIN_PREFETCH
nxt_feature_run=no
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="int main(void) {
                      __builtin_prefetch(0);
                      return 0;
                  }"
. auto/feature


nxt_feature="GCC __builtin_clz()"
nxt_feature_name=NXT_HAVE_BUILTIN_CLZ
nxt_feature_run=
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="int main(void) {
                      if (__builtin_clz(1) == 31)
                          return 0;
                      return 1;
                  }"
. auto/feature


nxt_feature="GCC __builtin_popcount()"
nxt_feature_name=NXT_HAVE_BUILTIN_POPCOUNT
nxt_feature_run=
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="int main(void) {
                      if (__builtin_popcount(5) == 2)
                          return 0;
                      return 1;
                  }"
. auto/feature


nxt_feature="GCC __attribute__ visibility"
nxt_feature_name=NXT_HAVE_GCC_ATTRIBUTE_VISIBILITY
nxt_feature_run=
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="int n __attribute__ ((visibility(\"default\")));

                  int main(void) {
                      return 1;
                  }"
. auto/feature


nxt_feature="GCC __attribute__ aligned"
nxt_feature_name=NXT_HAVE_GCC_ATTRIBUTE_ALIGNED
nxt_feature_run=
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="int n __attribute__ ((aligned(64)));

                  int main(void) {
                      return 1;
                  }"
. auto/feature


nxt_feature="GCC __attribute__ malloc"
nxt_feature_name=NXT_HAVE_GCC_ATTRIBUTE_MALLOC
nxt_feature_run=
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="#include <stdlib.h>

                  void *f(void) __attribute__ ((__malloc__));

                  void *f(void) {
                      return malloc(1);
                  }

                  int main(void) {
                      if (f() != NULL) {
                          return 1;
                      }
                      return 0;
                  }"
. auto/feature


nxt_feature="GCC __attribute__ packed"
nxt_feature_name=NXT_HAVE_GCC_ATTRIBUTE_PACKED
nxt_feature_run=
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="struct s {
                      char c;
                      int i;
                  } __attribute__ ((__packed__));

                  int main(void) {
                      return 1;
                  }"
. auto/feature


nxt_feature="GCC __attribute__ unused"
nxt_feature_name=NXT_HAVE_GCC_ATTRIBUTE_UNUSED
nxt_feature_run=
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="static void f(void) __attribute__ ((__unused__));

                  static void f(void)
                  {
                      return;
                  }

                  int main(void) {
                      return 0;
                  }"
. auto/feature