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
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
# remainder.m4 serial 10
dnl Copyright (C) 2012-2023 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_REMAINDER],
[
m4_divert_text([DEFAULTS], [gl_remainder_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Test whether remainder() is declared. On IRIX 5.3 it is not declared.
AC_CHECK_DECL([remainder], , [HAVE_DECL_REMAINDER=0], [[#include <math.h>]])
REMAINDER_LIBM=
AC_CACHE_CHECK([whether remainder() can be used without linking with libm],
[gl_cv_func_remainder_no_libm],
[
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
double x;
double y;]],
[[return remainder (x, y) > 1;]])],
[gl_cv_func_remainder_no_libm=yes],
[gl_cv_func_remainder_no_libm=no])
])
if test $gl_cv_func_remainder_no_libm = no; then
AC_CACHE_CHECK([whether remainder() can be used with libm],
[gl_cv_func_remainder_in_libm],
[
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
double x;
double y;]],
[[return remainder (x, y) > 1;]])],
[gl_cv_func_remainder_in_libm=yes],
[gl_cv_func_remainder_in_libm=no])
LIBS="$save_LIBS"
])
if test $gl_cv_func_remainder_in_libm = yes; then
REMAINDER_LIBM=-lm
fi
fi
if test $gl_cv_func_remainder_no_libm = yes \
|| test $gl_cv_func_remainder_in_libm = yes; then
:
m4_ifdef([gl_FUNC_REMAINDER_IEEE], [
if test $gl_remainder_required = ieee && test $REPLACE_REMAINDER = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether remainder works according to ISO C 99 with IEC 60559],
[gl_cv_func_remainder_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $REMAINDER_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
/* Compare two numbers with ==.
This is a separate function because IRIX 6.5 "cc -O" miscompiles an
'x == x' test. */
static int
numeric_equal (double x, double y)
{
return x == y;
}
static double dummy (double x, double y) { return 0; }
int main (int argc, char *argv[])
{
double (* volatile my_remainder) (double, double) = argc ? remainder : dummy;
double f;
/* Test remainder(...,0.0).
This test fails on OSF/1 5.1. */
f = my_remainder (2.0, 0.0);
if (numeric_equal (f, f))
return 1;
return 0;
}
]])],
[gl_cv_func_remainder_ieee=yes],
[gl_cv_func_remainder_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_remainder_ieee="guessing yes" ;;
# Guess yes on musl systems.
*-musl* | midipix*) gl_cv_func_remainder_ieee="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_remainder_ieee="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_remainder_ieee="$gl_cross_guess_normal" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_remainder_ieee" in
*yes) ;;
*) REPLACE_REMAINDER=1 ;;
esac
fi
])
else
HAVE_REMAINDER=0
fi
if test $HAVE_REMAINDER = 0 || test $REPLACE_REMAINDER = 1; then
dnl Find libraries needed to link lib/remainder.c.
AC_REQUIRE([gl_FUNC_FABS])
AC_REQUIRE([gl_FUNC_FMOD])
AC_REQUIRE([gl_FUNC_ISNAND])
REMAINDER_LIBM=
dnl Append $FABS_LIBM to REMAINDER_LIBM, avoiding gratuitous duplicates.
case " $REMAINDER_LIBM " in
*" $FABS_LIBM "*) ;;
*) REMAINDER_LIBM="$REMAINDER_LIBM $FABS_LIBM" ;;
esac
dnl Append $FMOD_LIBM to REMAINDER_LIBM, avoiding gratuitous duplicates.
case " $REMAINDER_LIBM " in
*" $FMOD_LIBM "*) ;;
*) REMAINDER_LIBM="$REMAINDER_LIBM $FMOD_LIBM" ;;
esac
dnl Append $ISNAND_LIBM to REMAINDER_LIBM, avoiding gratuitous duplicates.
case " $REMAINDER_LIBM " in
*" $ISNAND_LIBM "*) ;;
*) REMAINDER_LIBM="$REMAINDER_LIBM $ISNAND_LIBM" ;;
esac
fi
AC_SUBST([REMAINDER_LIBM])
])
|