# parse-datetime.m4 serial 22

dnl Copyright (C) 2002-2006, 2008-2018 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

dnl Define HAVE_COMPOUND_LITERALS if the C compiler supports compound literals

dnl as in ISO C99.

dnl Note that compound literals such as (struct s) { 3, 4 } can be used for

dnl initialization of stack-allocated variables, but are not constant

dnl expressions and therefore cannot be used as initializer for global or

dnl static variables (even though gcc supports this in pre-C99 mode).

AC_DEFUN([gl_C_COMPOUND_LITERALS],

[

  AC_CACHE_CHECK([for compound literals], [gl_cv_compound_literals],

  [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[struct s { int i, j; };]],

      [[struct s t = (struct s) { 3, 4 };

        if (t.i != 0) return 0;]])],

    gl_cv_compound_literals=yes,

    gl_cv_compound_literals=no)])

  if test $gl_cv_compound_literals = yes; then

    AC_DEFINE([HAVE_COMPOUND_LITERALS], [1],

      [Define if you have compound literals.])

  fi

])

AC_DEFUN([gl_PARSE_DATETIME],

[

  dnl Prerequisites of lib/parse-datetime.h.

  AC_REQUIRE([AM_STDBOOL_H])

  AC_REQUIRE([gl_TIMESPEC])

  dnl Prerequisites of lib/parse-datetime.y.

  AC_REQUIRE([gl_BISON])

  AC_REQUIRE([gl_C_COMPOUND_LITERALS])

  AC_STRUCT_TIMEZONE

  AC_REQUIRE([gl_CLOCK_TIME])

  AC_REQUIRE([gl_TM_GMTOFF])

])