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_CBRTL],
9 m4_divert_text([DEFAULTS], [gl_cbrtl_required=plain])
10 AC_REQUIRE([gl_MATH_H_DEFAULTS])
11 AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
12 AC_REQUIRE([gl_FUNC_CBRT])
14 dnl Test whether cbrtl() exists. Assume that cbrtl(), if it exists, is
15 dnl defined in the same library as cbrt().
17 LIBS="$LIBS $CBRT_LIBM"
18 AC_CHECK_FUNCS([cbrtl])
20 if test $ac_cv_func_cbrtl = yes; then
21 CBRTL_LIBM="$CBRT_LIBM"
22 dnl Also check whether it's declared.
23 dnl IRIX 6.5 has cbrtl() in libm but doesn't declare it in <math.h>.
24 AC_CHECK_DECL([cbrtl], , [HAVE_DECL_CBRTL=0], [[#include <math.h>]])
25 m4_ifdef([gl_FUNC_CBRTL_IEEE], [
26 if test $gl_cbrtl_required = ieee && test $REPLACE_CBRTL = 0; then
27 AC_CACHE_CHECK([whether cbrtl works according to ISO C 99 with IEC 60559],
28 [gl_cv_func_cbrtl_ieee],
31 LIBS="$LIBS $CBRTL_LIBM"
34 #ifndef __NO_MATH_INLINES
35 # define __NO_MATH_INLINES 1 /* for glibc */
38 ]gl_LONG_DOUBLE_MINUS_ZERO_CODE[
39 ]gl_LONG_DOUBLE_SIGNBIT_CODE[
40 static long double dummy (long double x) { return 0; }
41 int main (int argc, char *argv[])
47 long double cbrtl (long double);
48 long double (*my_cbrtl) (long double) = argc ? cbrtl : dummy;
51 This test fails on IRIX 6.5. */
52 f = my_cbrtl (minus_zerol);
53 if (!(f == 0.0L) || (signbitl (minus_zerol) && !signbitl (f)))
58 [gl_cv_func_cbrtl_ieee=yes],
59 [gl_cv_func_cbrtl_ieee=no],
60 [gl_cv_func_cbrtl_ieee="guessing no"])
63 case "$gl_cv_func_cbrtl_ieee" in
73 if test $HAVE_CBRTL = 0 || test $REPLACE_CBRTL = 1; then
74 dnl Find libraries needed to link lib/cbrtl.c.
75 if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
76 CBRTL_LIBM="$CBRT_LIBM"
78 AC_REQUIRE([gl_FUNC_FREXPL])
79 AC_REQUIRE([gl_FUNC_LDEXPL])
81 dnl Append $FREXPL_LIBM to CBRTL_LIBM, avoiding gratuitous duplicates.
82 case " $CBRTL_LIBM " in
83 *" $FREXPL_LIBM "*) ;;
84 *) CBRTL_LIBM="$CBRTL_LIBM $FREXPL_LIBM" ;;
86 dnl Append $LDEXPL_LIBM to CBRTL_LIBM, avoiding gratuitous duplicates.
87 case " $CBRTL_LIBM " in
88 *" $LDEXPL_LIBM "*) ;;
89 *) CBRTL_LIBM="$CBRTL_LIBM $LDEXPL_LIBM" ;;
93 AC_SUBST([CBRTL_LIBM])