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# tanl.m4 serial 2
dnl Copyright (C) 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_TANL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Persuade glibc <math.h> to declare tanl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
TANL_LIBM=
AC_CACHE_CHECK([whether tanl() can be used without linking with libm],
[gl_cv_func_tanl_no_libm],
[
AC_TRY_LINK([#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
long double x;],
[return tanl (x) > 0.4;],
[gl_cv_func_tanl_no_libm=yes],
[gl_cv_func_tanl_no_libm=no])
])
if test $gl_cv_func_tanl_no_libm = no; then
AC_CACHE_CHECK([whether tanl() can be used with libm],
[gl_cv_func_tanl_in_libm],
[
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
AC_TRY_LINK([#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
long double x;],
[return tanl (x) > 0.4;],
[gl_cv_func_tanl_in_libm=yes],
[gl_cv_func_tanl_in_libm=no])
LIBS="$save_LIBS"
])
if test $gl_cv_func_tanl_in_libm = yes; then
TANL_LIBM=-lm
fi
fi
if test $gl_cv_func_tanl_no_libm = yes \
|| test $gl_cv_func_tanl_in_libm = yes; then
dnl Also check whether it's declared.
dnl MacOS X 10.3 has tanl() in libc but doesn't declare it in <math.h>.
AC_CHECK_DECL([tanl], , [HAVE_DECL_TANL=0], [#include <math.h>])
else
HAVE_DECL_TANL=0
HAVE_TANL=0
AC_LIBOBJ([tanl])
AC_LIBOBJ([trigl])
AC_REQUIRE([gl_FUNC_ISNANL])
AC_REQUIRE([gl_FUNC_FLOOR])
AC_REQUIRE([gl_FUNC_FLOORL])
dnl Append $ISNANL_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
case " $TANL_LIBM " in
*" $ISNANL_LIBM "*) ;;
*) TANL_LIBM="$TANL_LIBM $ISNANL_LIBM" ;;
esac
dnl Append $FLOOR_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
case " $TANL_LIBM " in
*" $FLOOR_LIBM "*) ;;
*) TANL_LIBM="$TANL_LIBM $FLOOR_LIBM" ;;
esac
dnl Append $FLOORL_LIBM to TANL_LIBM, avoiding gratuitous duplicates.
case " $TANL_LIBM " in
*" $FLOORL_LIBM "*) ;;
*) TANL_LIBM="$TANL_LIBM $FLOORL_LIBM" ;;
esac
fi
AC_SUBST([TANL_LIBM])
])
|
