1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
# roundl.m4 serial 8
dnl Copyright (C) 2007, 2009-2011 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_ROUNDL],
[
m4_divert_text([DEFAULTS], [gl_roundl_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Persuade glibc <math.h> to declare roundl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CHECK_DECLS([roundl], , , [#include <math.h>])
if test "$ac_cv_have_decl_roundl" = yes; then
gl_CHECK_MATH_LIB([ROUNDL_LIBM], [x = roundl (x);])
if test "$ROUNDL_LIBM" = missing; then
REPLACE_ROUNDL=1
fi
m4_ifdef([gl_FUNC_ROUNDL_IEEE], [
if test $gl_roundl_required = ieee && test $REPLACE_ROUNDL = 0; then
AC_CACHE_CHECK([whether roundl works according to ISO C 99 with IEC 60559],
[gl_cv_func_roundl_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $ROUNDL_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
]gl_LONG_DOUBLE_MINUS_ZERO_CODE[
]gl_LONG_DOUBLE_SIGNBIT_CODE[
int main()
{
/* Test whether roundl (-0.0L) is -0.0L. */
if (signbitl (minus_zerol) && !signbitl (roundl (minus_zerol)))
return 1;
return 0;
}
]])],
[gl_cv_func_roundl_ieee=yes],
[gl_cv_func_roundl_ieee=no],
[gl_cv_func_roundl_ieee="guessing no"])
LIBS="$save_LIBS"
])
case "$gl_cv_func_roundl_ieee" in
*yes) ;;
*) REPLACE_ROUNDL=1 ;;
esac
fi
])
else
HAVE_DECL_ROUNDL=0
fi
if test $HAVE_DECL_ROUNDL = 0 || test $REPLACE_ROUNDL = 1; then
AC_LIBOBJ([roundl])
AC_CHECK_DECLS([ceill, floorl], , , [#include <math.h>])
if test "$ac_cv_have_decl_floorl" = yes \
&& test "$ac_cv_have_decl_ceill" = yes; then
gl_FUNC_FLOORL_LIBS
gl_FUNC_CEILL_LIBS
if test "$FLOORL_LIBM" != '?' && test "$CEILL_LIBM" != '?'; then
AC_DEFINE([HAVE_FLOORL_AND_CEILL], [1],
[Define if the both the floorl() and ceill() functions exist.])
ROUNDL_LIBM=
dnl Append $FLOORL_LIBM to ROUNDL_LIBM, avoiding gratuitous duplicates.
case " $ROUNDL_LIBM " in
*" $FLOORL_LIBM "*) ;;
*) ROUNDL_LIBM="$ROUNDL_LIBM $FLOORL_LIBM" ;;
esac
dnl Append $CEILL_LIBM to ROUNDL_LIBM, avoiding gratuitous duplicates.
case " $ROUNDL_LIBM " in
*" $CEILL_LIBM "*) ;;
*) ROUNDL_LIBM="$ROUNDL_LIBM $CEILL_LIBM" ;;
esac
else
ROUNDL_LIBM=
fi
else
ROUNDL_LIBM=
fi
fi
AC_SUBST([ROUNDL_LIBM])
])
|
