2 dnl Copyright (C) 2010-2012 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_SQRTL],
9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
10 AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
12 dnl Persuade glibc <math.h> to declare sqrtl().
13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
16 AC_CACHE_CHECK([whether sqrtl() can be used without linking with libm],
17 [gl_cv_func_sqrtl_no_libm],
21 [[#ifndef __NO_MATH_INLINES
22 # define __NO_MATH_INLINES 1 /* for glibc */
26 [[return sqrtl (x) > 0.4;]])],
27 [gl_cv_func_sqrtl_no_libm=yes],
28 [gl_cv_func_sqrtl_no_libm=no])
30 if test $gl_cv_func_sqrtl_no_libm = no; then
31 AC_CACHE_CHECK([whether sqrtl() can be used with libm],
32 [gl_cv_func_sqrtl_in_libm],
38 [[#ifndef __NO_MATH_INLINES
39 # define __NO_MATH_INLINES 1 /* for glibc */
43 [[return sqrtl (x) > 0.4;]])],
44 [gl_cv_func_sqrtl_in_libm=yes],
45 [gl_cv_func_sqrtl_in_libm=no])
48 if test $gl_cv_func_sqrtl_in_libm = yes; then
52 if test $gl_cv_func_sqrtl_no_libm = yes \
53 || test $gl_cv_func_sqrtl_in_libm = yes; then
54 dnl Also check whether it's declared.
55 dnl MacOS X 10.3 has sqrtl() in libc but doesn't declare it in <math.h>.
56 AC_CHECK_DECL([sqrtl], , [HAVE_DECL_SQRTL=0], [[#include <math.h>]])
60 dnl Find libraries needed to link lib/sqrtl.c.
61 if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
62 AC_REQUIRE([gl_FUNC_SQRT])
63 SQRTL_LIBM="$SQRT_LIBM"
65 AC_REQUIRE([gl_FUNC_ISNANL])
66 AC_REQUIRE([gl_FUNC_FREXPL])
67 AC_REQUIRE([gl_FUNC_LDEXPL])
68 AC_REQUIRE([gl_FUNC_SQRT])
69 dnl Append $ISNANL_LIBM to SQRTL_LIBM, avoiding gratuitous duplicates.
70 case " $SQRTL_LIBM " in
71 *" $ISNANL_LIBM "*) ;;
72 *) SQRTL_LIBM="$SQRTL_LIBM $ISNANL_LIBM" ;;
74 dnl Append $FREXPL_LIBM to SQRTL_LIBM, avoiding gratuitous duplicates.
75 case " $SQRTL_LIBM " in
76 *" $FREXPL_LIBM "*) ;;
77 *) SQRTL_LIBM="$SQRTL_LIBM $FREXPL_LIBM" ;;
79 dnl Append $LDEXPL_LIBM to SQRTL_LIBM, avoiding gratuitous duplicates.
80 case " $SQRTL_LIBM " in
81 *" $LDEXPL_LIBM "*) ;;
82 *) SQRTL_LIBM="$SQRTL_LIBM $LDEXPL_LIBM" ;;
84 dnl Append $SQRT_LIBM to SQRTL_LIBM, avoiding gratuitous duplicates.
85 case " $SQRTL_LIBM " in
87 *) SQRTL_LIBM="$SQRTL_LIBM $SQRT_LIBM" ;;
91 AC_SUBST([SQRTL_LIBM])