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# truncl.m4 serial 5
dnl Copyright (C) 2007-2008, 2010 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_TRUNCL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
dnl Persuade glibc <math.h> to declare truncl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether truncl() is declared.
AC_CHECK_DECLS([truncl], , , [#include <math.h>])
if test "$ac_cv_have_decl_truncl" = yes; then
dnl Test whether truncl() can be used without libm.
TRUNCL_LIBM=?
AC_TRY_LINK([
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
long double x;],
[x = truncl(x);],
[TRUNCL_LIBM=])
if test "$TRUNCL_LIBM" = "?"; then
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
AC_TRY_LINK([
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
long double x;],
[x = truncl(x);],
[TRUNCL_LIBM="-lm"])
LIBS="$save_LIBS"
fi
if test "$TRUNCL_LIBM" = "?"; then
TRUNCL_LIBM=
fi
dnl Test whether truncl() works. It crashes on OSF/1 4.0d.
save_LIBS="$LIBS"
LIBS="$LIBS $TRUNCL_LIBM"
AC_CACHE_CHECK([whether truncl works], [gl_cv_func_truncl_works],
[
AC_TRY_RUN([
#include <math.h>
long double x;
int main()
{
x = truncl (0.0L);
return 0;
}], [gl_cv_func_truncl_works=yes], [gl_cv_func_truncl_works=no],
[case "$host_os" in
osf4*) gl_cv_func_truncl_works="guessing no";;
*) gl_cv_func_truncl_works="guessing yes";;
esac
])
])
LIBS="$save_LIBS"
case "$gl_cv_func_truncl_works" in
*yes) ;;
*) REPLACE_TRUNCL=1 ;;
esac
else
HAVE_DECL_TRUNCL=0
fi
if test $HAVE_DECL_TRUNCL = 0 || test $REPLACE_TRUNCL = 1; then
AC_LIBOBJ([truncl])
TRUNCL_LIBM=
fi
AC_SUBST([TRUNCL_LIBM])
])
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