1 # remainderl.m4 serial 4
2 dnl Copyright (C) 2012 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_REMAINDERL],
9 m4_divert_text([DEFAULTS], [gl_remainderl_required=plain])
10 AC_REQUIRE([gl_MATH_H_DEFAULTS])
11 AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
12 AC_REQUIRE([gl_FUNC_REMAINDER])
14 dnl Persuade glibc <math.h> to declare remainderl().
15 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
17 dnl Test whether remainderl() exists. Assume that remainderl(), if it exists, is
18 dnl defined in the same library as remainder().
20 LIBS="$LIBS $REMAINDER_LIBM"
21 AC_CACHE_CHECK([for remainderl],
22 [gl_cv_func_remainderl],
26 [[#ifndef __NO_MATH_INLINES
27 # define __NO_MATH_INLINES 1 /* for glibc */
30 long double (*funcptr) (long double, long double) = remainderl;
33 [[return funcptr (x, y) > 1
34 || remainderl (x, y) > 1;]])],
35 [gl_cv_func_remainderl=yes],
36 [gl_cv_func_remainderl=no])
39 if test $gl_cv_func_remainderl = yes; then
40 REMAINDERL_LIBM="$REMAINDER_LIBM"
41 m4_ifdef([gl_FUNC_REMAINDERL_IEEE], [
42 if test $gl_remainderl_required = ieee && test $REPLACE_REMAINDERL = 0; then
43 AC_CACHE_CHECK([whether remainderl works according to ISO C 99 with IEC 60559],
44 [gl_cv_func_remainderl_ieee],
47 LIBS="$LIBS $REMAINDERL_LIBM"
50 #ifndef __NO_MATH_INLINES
51 # define __NO_MATH_INLINES 1 /* for glibc */
54 /* Compare two numbers with ==.
55 This is a separate function because IRIX 6.5 "cc -O" miscompiles an
58 numeric_equal (long double x, long double y)
62 static long double dummy (long double x, long double y) { return 0; }
63 int main (int argc, char *argv[])
65 long double (*my_remainderl) (long double, long double) = argc ? remainderl : dummy;
67 /* Test remainderl(...,0.0L).
68 This test fails on OSF/1 5.1. */
69 f = my_remainderl (2.0L, 0.0L);
70 if (numeric_equal (f, f))
75 [gl_cv_func_remainderl_ieee=yes],
76 [gl_cv_func_remainderl_ieee=no],
77 [gl_cv_func_remainderl_ieee="guessing no"])
80 case "$gl_cv_func_remainderl_ieee" in
82 *) REPLACE_REMAINDERL=1 ;;
89 if test $HAVE_REMAINDERL = 0 || test $REPLACE_REMAINDERL = 1; then
90 dnl Find libraries needed to link lib/remainderl.c.
91 if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
92 REMAINDERL_LIBM="$REMAINDER_LIBM"
94 AC_REQUIRE([gl_FUNC_FABSL])
95 AC_REQUIRE([gl_FUNC_FMODL])
96 AC_REQUIRE([gl_FUNC_ISNANL])
98 dnl Append $FABSL_LIBM to REMAINDERL_LIBM, avoiding gratuitous duplicates.
99 case " $REMAINDERL_LIBM " in
100 *" $FABSL_LIBM "*) ;;
101 *) REMAINDERL_LIBM="$REMAINDERL_LIBM $FABSL_LIBM" ;;
103 dnl Append $FMODL_LIBM to REMAINDERL_LIBM, avoiding gratuitous duplicates.
104 case " $REMAINDERL_LIBM " in
105 *" $FMODL_LIBM "*) ;;
106 *) REMAINDERL_LIBM="$REMAINDERL_LIBM $FMODL_LIBM" ;;
108 dnl Append $ISNANL_LIBM to REMAINDERL_LIBM, avoiding gratuitous duplicates.
109 case " $REMAINDERL_LIBM " in
110 *" $ISNANL_LIBM "*) ;;
111 *) REMAINDERL_LIBM="$REMAINDERL_LIBM $ISNANL_LIBM" ;;
115 AC_SUBST([REMAINDERL_LIBM])