# langinfo_h.m4 serial 8

dnl Copyright (C) 2009-2020 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.

AC_DEFUN([gl_LANGINFO_H],

[

  AC_REQUIRE([gl_LANGINFO_H_DEFAULTS])

  dnl Persuade glibc-2.0.6 <langinfo.h> to define CODESET.

  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])

  dnl <langinfo.h> is always overridden, because of GNULIB_POSIXCHECK.

  gl_CHECK_NEXT_HEADERS([langinfo.h])

  dnl Determine whether <langinfo.h> exists. It is missing on mingw and BeOS.

  HAVE_LANGINFO_CODESET=0

  HAVE_LANGINFO_T_FMT_AMPM=0

  HAVE_LANGINFO_ALTMON=0

  HAVE_LANGINFO_ERA=0

  HAVE_LANGINFO_YESEXPR=0

  AC_CHECK_HEADERS_ONCE([langinfo.h])

  if test $ac_cv_header_langinfo_h = yes; then

    HAVE_LANGINFO_H=1

    dnl Determine what <langinfo.h> defines. CODESET and ERA etc. are missing

    dnl on OpenBSD 3.8. T_FMT_AMPM and YESEXPR, NOEXPR are missing on IRIX 5.3.

    dnl ALTMON_* are missing on glibc 2.26 and many other systems.

    AC_CACHE_CHECK([whether langinfo.h defines CODESET],

      [gl_cv_header_langinfo_codeset],

      [AC_COMPILE_IFELSE(

         [AC_LANG_PROGRAM([[#include <langinfo.h>

int a = CODESET;

]])],

         [gl_cv_header_langinfo_codeset=yes],

         [gl_cv_header_langinfo_codeset=no])

      ])

    if test $gl_cv_header_langinfo_codeset = yes; then

      HAVE_LANGINFO_CODESET=1

    fi

    AC_CACHE_CHECK([whether langinfo.h defines T_FMT_AMPM],

      [gl_cv_header_langinfo_t_fmt_ampm],

      [AC_COMPILE_IFELSE(

         [AC_LANG_PROGRAM([[#include <langinfo.h>

int a = T_FMT_AMPM;

]])],

         [gl_cv_header_langinfo_t_fmt_ampm=yes],

         [gl_cv_header_langinfo_t_fmt_ampm=no])

      ])

    if test $gl_cv_header_langinfo_t_fmt_ampm = yes; then

      HAVE_LANGINFO_T_FMT_AMPM=1

    fi

    AC_CACHE_CHECK([whether langinfo.h defines ALTMON_1],

      [gl_cv_header_langinfo_altmon],

      [AC_COMPILE_IFELSE(

         [AC_LANG_PROGRAM([[#include <langinfo.h>

int a = ALTMON_1;

]])],

         [gl_cv_header_langinfo_altmon=yes],

         [gl_cv_header_langinfo_altmon=no])

      ])

    if test $gl_cv_header_langinfo_altmon = yes; then

      HAVE_LANGINFO_ALTMON=1

    fi

    AC_CACHE_CHECK([whether langinfo.h defines ERA],

      [gl_cv_header_langinfo_era],

      [AC_COMPILE_IFELSE(

         [AC_LANG_PROGRAM([[#include <langinfo.h>

int a = ERA;

]])],

         [gl_cv_header_langinfo_era=yes],

         [gl_cv_header_langinfo_era=no])

      ])

    if test $gl_cv_header_langinfo_era = yes; then

      HAVE_LANGINFO_ERA=1

    fi

    AC_CACHE_CHECK([whether langinfo.h defines YESEXPR],

      [gl_cv_header_langinfo_yesexpr],

      [AC_COMPILE_IFELSE(

         [AC_LANG_PROGRAM([[#include <langinfo.h>

int a = YESEXPR;

]])],

         [gl_cv_header_langinfo_yesexpr=yes],

         [gl_cv_header_langinfo_yesexpr=no])

      ])

    if test $gl_cv_header_langinfo_yesexpr = yes; then

      HAVE_LANGINFO_YESEXPR=1

    fi

  else

    HAVE_LANGINFO_H=0

  fi

  AC_SUBST([HAVE_LANGINFO_H])

  AC_SUBST([HAVE_LANGINFO_CODESET])

  AC_SUBST([HAVE_LANGINFO_T_FMT_AMPM])

  AC_SUBST([HAVE_LANGINFO_ALTMON])

  AC_SUBST([HAVE_LANGINFO_ERA])

  AC_SUBST([HAVE_LANGINFO_YESEXPR])

  dnl Check for declarations of anything we want to poison if the

  dnl corresponding gnulib module is not in use.

  gl_WARN_ON_USE_PREPARE([[#include <langinfo.h>

    ]], [nl_langinfo])

])

AC_DEFUN([gl_LANGINFO_MODULE_INDICATOR],

[

  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.

  AC_REQUIRE([gl_LANGINFO_H_DEFAULTS])

  gl_MODULE_INDICATOR_SET_VARIABLE([$1])

  dnl Define it also as a C macro, for the benefit of the unit tests.

  gl_MODULE_INDICATOR_FOR_TESTS([$1])

])

AC_DEFUN([gl_LANGINFO_H_DEFAULTS],

[

  GNULIB_NL_LANGINFO=0;  AC_SUBST([GNULIB_NL_LANGINFO])

  dnl Assume proper GNU behavior unless another module says otherwise.

  HAVE_NL_LANGINFO=1;    AC_SUBST([HAVE_NL_LANGINFO])

  REPLACE_NL_LANGINFO=0; AC_SUBST([REPLACE_NL_LANGINFO])

])