File: tanf.m4

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# tanf.m4 serial 1
dnl Copyright (C) 2011 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_FUNC_TANF],
[
  AC_REQUIRE([gl_MATH_H_DEFAULTS])
  AC_REQUIRE([gl_FUNC_TAN])

  dnl Test whether tanf() exists. Assume that tanf(), if it exists, is
  dnl defined in the same library as tan().
  save_LIBS="$LIBS"
  LIBS="$LIBS $TAN_LIBM"
  AC_CHECK_FUNCS([tanf])
  LIBS="$save_LIBS"
  if test $ac_cv_func_tanf = yes; then
    TANF_LIBM="$TAN_LIBM"
  else
    HAVE_TANF=0
    TANF_LIBM="$TAN_LIBM"
  fi
  AC_SUBST([TANF_LIBM])
])