2 dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_LOGL],
9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
10 dnl Persuade glibc <math.h> to declare logl().
11 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
14 AC_CACHE_CHECK([whether logl() can be used without linking with libm],
15 [gl_cv_func_logl_no_libm],
19 [[#ifndef __NO_MATH_INLINES
20 # define __NO_MATH_INLINES 1 /* for glibc */
24 [[return logl (x) > 1;]])],
25 [gl_cv_func_logl_no_libm=yes],
26 [gl_cv_func_logl_no_libm=no])
28 if test $gl_cv_func_logl_no_libm = no; then
29 AC_CACHE_CHECK([whether logl() can be used with libm],
30 [gl_cv_func_logl_in_libm],
36 [[#ifndef __NO_MATH_INLINES
37 # define __NO_MATH_INLINES 1 /* for glibc */
41 [[return logl (x) > 1;]])],
42 [gl_cv_func_logl_in_libm=yes],
43 [gl_cv_func_logl_in_libm=no])
46 if test $gl_cv_func_logl_in_libm = yes; then
50 if test $gl_cv_func_logl_no_libm = yes \
51 || test $gl_cv_func_logl_in_libm = yes; then
52 dnl Also check whether it's declared.
53 dnl MacOS X 10.3 has logl() in libc but doesn't declare it in <math.h>.
54 AC_CHECK_DECL([logl], , [HAVE_DECL_LOGL=0], [#include <math.h>])
58 dnl Find libraries needed to link lib/logl.c.
59 AC_REQUIRE([gl_FUNC_FREXPL])
60 AC_REQUIRE([gl_FUNC_ISNANL])
61 AC_REQUIRE([gl_FUNC_FLOORL])
62 dnl Append $FREXPL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
63 case " $LOGL_LIBM " in
64 *" $FREXPL_LIBM "*) ;;
65 *) LOGL_LIBM="$LOGL_LIBM $FREXPL_LIBM" ;;
67 dnl Append $ISNANL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
68 case " $LOGL_LIBM " in
69 *" $ISNANL_LIBM "*) ;;
70 *) LOGL_LIBM="$LOGL_LIBM $ISNANL_LIBM" ;;
72 dnl Append $FLOORL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
73 case " $LOGL_LIBM " in
74 *" $FLOORL_LIBM "*) ;;
75 *) LOGL_LIBM="$LOGL_LIBM $FLOORL_LIBM" ;;