--- /dev/null
+# frexpl.m4 serial 9
+dnl Copyright (C) 2007-2009 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_FREXPL],
+[
+ AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ FREXPL_LIBM=
+ AC_CACHE_CHECK([whether frexpl() can be used without linking with libm],
+ [gl_cv_func_frexpl_no_libm],
+ [
+ AC_TRY_LINK([#include <math.h>
+ long double x;],
+ [int e; return frexpl (x, &e) > 0;],
+ [gl_cv_func_frexpl_no_libm=yes],
+ [gl_cv_func_frexpl_no_libm=no])
+ ])
+ if test $gl_cv_func_frexpl_no_libm = no; then
+ AC_CACHE_CHECK([whether frexpl() can be used with libm],
+ [gl_cv_func_frexpl_in_libm],
+ [
+ save_LIBS="$LIBS"
+ LIBS="$LIBS -lm"
+ AC_TRY_LINK([#include <math.h>
+ long double x;],
+ [int e; return frexpl (x, &e) > 0;],
+ [gl_cv_func_frexpl_in_libm=yes],
+ [gl_cv_func_frexpl_in_libm=no])
+ LIBS="$save_LIBS"
+ ])
+ if test $gl_cv_func_frexpl_in_libm = yes; then
+ FREXPL_LIBM=-lm
+ fi
+ fi
+ if test $gl_cv_func_frexpl_no_libm = yes \
+ || test $gl_cv_func_frexpl_in_libm = yes; then
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $FREXPL_LIBM"
+ gl_FUNC_FREXPL_WORKS
+ LIBS="$save_LIBS"
+ case "$gl_cv_func_frexpl_works" in
+ *yes) gl_func_frexpl=yes ;;
+ *) gl_func_frexpl=no; REPLACE_FREXPL=1; FREXPL_LIBM= ;;
+ esac
+ else
+ gl_func_frexpl=no
+ fi
+ if test $gl_func_frexpl = yes; then
+ AC_DEFINE([HAVE_FREXPL], [1],
+ [Define if the frexpl() function is available.])
+ dnl Also check whether it's declared.
+ dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>.
+ AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [#include <math.h>])
+ else
+ HAVE_DECL_FREXPL=0
+ AC_LIBOBJ([frexpl])
+ fi
+ AC_SUBST([FREXPL_LIBM])
+])
+
+AC_DEFUN([gl_FUNC_FREXPL_NO_LIBM],
+[
+ AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_CACHE_CHECK([whether frexpl() can be used without linking with libm],
+ [gl_cv_func_frexpl_no_libm],
+ [
+ AC_TRY_LINK([#include <math.h>
+ long double x;],
+ [int e; return frexpl (x, &e) > 0;],
+ [gl_cv_func_frexpl_no_libm=yes],
+ [gl_cv_func_frexpl_no_libm=no])
+ ])
+ if test $gl_cv_func_frexpl_no_libm = yes; then
+ gl_FUNC_FREXPL_WORKS
+ case "$gl_cv_func_frexpl_works" in
+ *yes) gl_func_frexpl_no_libm=yes ;;
+ *) gl_func_frexpl_no_libm=no; REPLACE_FREXPL=1 ;;
+ esac
+ else
+ gl_func_frexpl_no_libm=no
+ dnl Set REPLACE_FREXPL here because the system may have frexpl in libm.
+ REPLACE_FREXPL=1
+ fi
+ if test $gl_func_frexpl_no_libm = yes; then
+ AC_DEFINE([HAVE_FREXPL_IN_LIBC], [1],
+ [Define if the frexpl() function is available in libc.])
+ dnl Also check whether it's declared.
+ dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>.
+ AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [#include <math.h>])
+ else
+ HAVE_DECL_FREXPL=0
+ AC_LIBOBJ([frexpl])
+ fi
+])
+
+dnl Test whether frexpl() works on finite numbers (this fails on
+dnl MacOS X 10.4/PowerPC, on AIX 5.1, and on BeOS), on denormalized numbers
+dnl (this fails on MacOS X 10.5/i386), and also on infinite numbers (this
+dnl fails e.g. on IRIX 6.5 and mingw).
+AC_DEFUN([gl_FUNC_FREXPL_WORKS],
+[
+ AC_REQUIRE([AC_PROG_CC])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([whether frexpl works], [gl_cv_func_frexpl_works],
+ [
+ AC_TRY_RUN([
+#include <float.h>
+#include <math.h>
+/* Override the values of <float.h>, like done in float.in.h. */
+#if defined __i386__ && (defined __BEOS__ || defined __OpenBSD__)
+# undef LDBL_MIN_EXP
+# define LDBL_MIN_EXP (-16381)
+#endif
+extern long double frexpl (long double, int *);
+int main()
+{
+ volatile long double x;
+ /* Test on finite numbers that fails on AIX 5.1. */
+ x = 16.0L;
+ {
+ int exp = -9999;
+ frexpl (x, &exp);
+ if (exp != 5)
+ return 1;
+ }
+ /* Test on finite numbers that fails on MacOS X 10.4, because its frexpl
+ function returns an invalid (incorrectly normalized) value: it returns
+ y = { 0x3fe028f5, 0xc28f5c28, 0x3c9eb851, 0xeb851eb8 }
+ but the correct result is
+ 0.505L = { 0x3fe028f5, 0xc28f5c29, 0xbc547ae1, 0x47ae1480 } */
+ x = 1.01L;
+ {
+ int exp = -9999;
+ long double y = frexpl (x, &exp);
+ if (!(exp == 1 && y == 0.505L))
+ return 1;
+ }
+ /* Test on large finite numbers. This fails on BeOS at i = 16322, while
+ LDBL_MAX_EXP = 16384.
+ In the loop end test, we test x against Infinity, rather than comparing
+ i with LDBL_MAX_EXP, because BeOS <float.h> has a wrong LDBL_MAX_EXP. */
+ {
+ int i;
+ for (i = 1, x = 1.0L; x != x + x; i++, x *= 2.0L)
+ {
+ int exp = -9999;
+ frexpl (x, &exp);
+ if (exp != i)
+ return 1;
+ }
+ }
+ /* Test on denormalized numbers. */
+ {
+ int i;
+ for (i = 1, x = 1.0L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
+ ;
+ if (x > 0.0L)
+ {
+ int exp;
+ long double y = frexpl (x, &exp);
+ /* On machines with IEEE854 arithmetic: x = 1.68105e-4932,
+ exp = -16382, y = 0.5. On MacOS X 10.5: exp = -16384, y = 0.5. */
+ if (exp != LDBL_MIN_EXP - 1)
+ return 1;
+ }
+ }
+ /* Test on infinite numbers. */
+ x = 1.0L / 0.0L;
+ {
+ int exp;
+ long double y = frexpl (x, &exp);
+ if (y != x)
+ return 1;
+ }
+ return 0;
+}], [gl_cv_func_frexpl_works=yes], [gl_cv_func_frexpl_works=no],
+ [case "$host_os" in
+ aix* | beos* | darwin* | irix* | mingw* | pw*)
+ gl_cv_func_frexpl_works="guessing no";;
+ *) gl_cv_func_frexpl_works="guessing yes";;
+ esac
+ ])
+ ])
+])
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