2 dnl Copyright (C) 2011-2012 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_FMODL],
9 m4_divert_text([DEFAULTS], [gl_fmodl_required=plain])
10 AC_REQUIRE([gl_MATH_H_DEFAULTS])
11 AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
12 AC_REQUIRE([gl_FUNC_FMOD])
14 dnl Test whether fmodl() is declared.
15 dnl AIX 5.1 has fmodl() in libc but doesn't declare it in <math.h>, and the
16 dnl function produces NaN results for finite values.
17 AC_CHECK_DECL([fmodl],
18 [ac_cv_have_decl_fmodl=yes], [ac_cv_have_decl_fmodl=no],
19 [[#include <math.h>]])
21 dnl Test whether fmodl() exists. Assume that fmodl(), if it exists, is
22 dnl defined in the same library as fmod().
24 LIBS="$LIBS $FMOD_LIBM"
25 AC_CHECK_FUNCS([fmodl])
27 if test $ac_cv_func_fmodl = yes; then
28 FMODL_LIBM="$FMOD_LIBM"
29 if test $ac_cv_have_decl_fmodl = no; then
32 m4_ifdef([gl_FUNC_FMODL_IEEE], [
33 if test $gl_fmodl_required = ieee && test $REPLACE_FMODL = 0; then
34 AC_CACHE_CHECK([whether fmodl works according to ISO C 99 with IEC 60559],
35 [gl_cv_func_fmodl_ieee],
38 LIBS="$LIBS $FMODL_LIBM"
41 #ifndef __NO_MATH_INLINES
42 # define __NO_MATH_INLINES 1 /* for glibc */
45 /* Compare two numbers with ==.
46 This is a separate function because IRIX 6.5 "cc -O" miscompiles an
49 numeric_equal (long double x, long double y)
53 static long double dummy (long double x, long double y) { return 0; }
54 int main (int argc, char *argv[])
56 long double (*my_fmodl) (long double, long double) = argc ? fmodl : dummy;
59 /* Test fmodl(...,0.0L).
60 This test fails on OSF/1 5.1. */
61 f = my_fmodl (2.0L, 0.0L);
62 if (numeric_equal (f, f))
67 [gl_cv_func_fmodl_ieee=yes],
68 [gl_cv_func_fmodl_ieee=no],
69 [gl_cv_func_fmodl_ieee="guessing no"])
72 case "$gl_cv_func_fmodl_ieee" in
81 if test $HAVE_FMODL = 0 || test $REPLACE_FMODL = 1; then
82 dnl Find libraries needed to link lib/fmodl.c.
83 if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
84 FMODL_LIBM="$FMOD_LIBM"
86 AC_REQUIRE([gl_FUNC_TRUNCL])
87 AC_REQUIRE([gl_FUNC_FMAL])
89 dnl Append $TRUNCL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates.
90 case " $FMODL_LIBM " in
91 *" $TRUNCL_LIBM "*) ;;
92 *) FMODL_LIBM="$FMODL_LIBM $TRUNCL_LIBM" ;;
94 dnl Append $FMAL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates.
95 case " $FMODL_LIBM " in
97 *) FMODL_LIBM="$FMODL_LIBM $FMAL_LIBM" ;;
101 AC_SUBST([FMODL_LIBM])