1 # remainderl.m4 serial 5
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 */
34 long double remainderl (long double, long double);
35 long double (*funcptr) (long double, long double) = remainderl;
38 [[return funcptr (x, y) > 1
39 || remainderl (x, y) > 1;]])],
40 [gl_cv_func_remainderl=yes],
41 [gl_cv_func_remainderl=no])
44 if test $gl_cv_func_remainderl = yes; then
46 REMAINDERL_LIBM="$REMAINDER_LIBM"
47 dnl Also check whether it's declared.
48 dnl IRIX 6.5 has remainderl() in libm but doesn't declare it in <math.h>.
49 AC_CHECK_DECLS([remainderl], , [HAVE_DECL_REMAINDERL=0], [[#include <math.h>]])
50 m4_ifdef([gl_FUNC_REMAINDERL_IEEE], [
51 if test $gl_remainderl_required = ieee && test $REPLACE_REMAINDERL = 0; then
52 AC_CACHE_CHECK([whether remainderl works according to ISO C 99 with IEC 60559],
53 [gl_cv_func_remainderl_ieee],
56 LIBS="$LIBS $REMAINDERL_LIBM"
59 #ifndef __NO_MATH_INLINES
60 # define __NO_MATH_INLINES 1 /* for glibc */
67 long double remainderl (long double, long double);
68 /* Compare two numbers with ==.
69 This is a separate function because IRIX 6.5 "cc -O" miscompiles an
72 numeric_equal (long double x, long double y)
76 static long double dummy (long double x, long double y) { return 0; }
77 int main (int argc, char *argv[])
79 long double (*my_remainderl) (long double, long double) = argc ? remainderl : dummy;
81 /* Test remainderl(...,0.0L).
82 This test fails on OSF/1 5.1. */
83 f = my_remainderl (2.0L, 0.0L);
84 if (numeric_equal (f, f))
89 [gl_cv_func_remainderl_ieee=yes],
90 [gl_cv_func_remainderl_ieee=no],
91 [gl_cv_func_remainderl_ieee="guessing no"])
94 case "$gl_cv_func_remainderl_ieee" in
96 *) REPLACE_REMAINDERL=1 ;;
102 HAVE_DECL_REMAINDERL=0
104 if test $HAVE_REMAINDERL = 0 || test $REPLACE_REMAINDERL = 1; then
105 dnl Find libraries needed to link lib/remainderl.c.
106 if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
107 REMAINDERL_LIBM="$REMAINDER_LIBM"
109 AC_REQUIRE([gl_FUNC_FABSL])
110 AC_REQUIRE([gl_FUNC_FMODL])
111 AC_REQUIRE([gl_FUNC_ISNANL])
113 dnl Append $FABSL_LIBM to REMAINDERL_LIBM, avoiding gratuitous duplicates.
114 case " $REMAINDERL_LIBM " in
115 *" $FABSL_LIBM "*) ;;
116 *) REMAINDERL_LIBM="$REMAINDERL_LIBM $FABSL_LIBM" ;;
118 dnl Append $FMODL_LIBM to REMAINDERL_LIBM, avoiding gratuitous duplicates.
119 case " $REMAINDERL_LIBM " in
120 *" $FMODL_LIBM "*) ;;
121 *) REMAINDERL_LIBM="$REMAINDERL_LIBM $FMODL_LIBM" ;;
123 dnl Append $ISNANL_LIBM to REMAINDERL_LIBM, avoiding gratuitous duplicates.
124 case " $REMAINDERL_LIBM " in
125 *" $ISNANL_LIBM "*) ;;
126 *) REMAINDERL_LIBM="$REMAINDERL_LIBM $ISNANL_LIBM" ;;
130 AC_SUBST([REMAINDERL_LIBM])