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# ===========================================================================
# http://www.gnu.org/software/autoconf-archive/ax_c99_struct_init.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_C99_STRUCT_INIT
#
# DESCRIPTION
#
# This macro defines MISSING_C99_STRUCT_INIT if the C compiler does not
# supports the C99 tagged structure initialization.
#
# Given: struct foo_s {int i1; int i2; int i3;};
# one can write:
# #if !define(MISSING_C99_STRUCT_INIT)
# # define FOO_INIT(a, b, c) { .i1 = a, .i2 = b, .i3 = c }
# #else
# # define FOO_INIT(a, b, c) { a, b, c }
#
# static struct foo_s foo[] = {
# FOO_INIT(1, 1, 1),
# FOO_INIT(2, 2, 2),
# FOO_INIT(0, 0, 0)
# };
#
# LICENSE
#
# Copyright (c) 2015 Network Time Foundation
#
# Author: Harlan Stenn <stenn@nwtime.org>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 1
AC_DEFUN([AX_C99_STRUCT_INIT], [
AC_MSG_CHECKING([whether the compiler supports C99 structure initialization])
AC_REQUIRE([AC_PROG_CC_C99])
AC_LANG_PUSH([C])
dnl AC_LINK_IFELSE?
AC_COMPILE_IFELSE(
[AC_LANG_SOURCE([[
struct foo_s {int i1; int i2;};
int main() { struct foo_s foo[] = { { .i1 = 1, .i2 = 1 }, { .i1 = 2, .i2 = 2 }, { .i1 = 0, .i2 = 0 } }; }
]])],
AC_MSG_RESULT([yes]),
AC_MSG_RESULT([no])
AC_DEFINE([MISSING_C99_STRUCT_INIT], [1],
[Define to 1 if the compiler does not support C99's structure initialization.]),
)
AC_LANG_POP([C])
]);
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