* m4/log10f-ieee.m4: New file.
* m4/log10f.m4 (gl_FUNC_LOG10F): If gl_FUNC_LOG10F_IEEE is present,
test whether log10f works with a negative argument. Replace it if not.
* lib/log10f.c (log10f): For negative arguments, return NaN.
* modules/log10f-ieee (Files): Add m4/log10f-ieee.m4.
(configure.ac): Invoke gl_FUNC_LOG10F_IEEE.
* doc/posix-functions/log10f.texi: Mention the log10f-ieee module.
2012-04-01 Bruno Haible <bruno@clisp.org>
+ log10f-ieee: Work around test failure on NetBSD 5.1.
+ * m4/log10f-ieee.m4: New file.
+ * m4/log10f.m4 (gl_FUNC_LOG10F): If gl_FUNC_LOG10F_IEEE is present,
+ test whether log10f works with a negative argument. Replace it if not.
+ * lib/log10f.c (log10f): For negative arguments, return NaN.
+ * modules/log10f-ieee (Files): Add m4/log10f-ieee.m4.
+ (configure.ac): Invoke gl_FUNC_LOG10F_IEEE.
+ * doc/posix-functions/log10f.texi: Mention the log10f-ieee module.
+
log10f-ieee: Work around test failure on Solaris 9.
* modules/log10f-ieee (Depends-on): Add log10-ieee.
(configure.ac): Require gl_FUNC_LOG10F.
POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/log10f.html}
-Gnulib module: log10f
+Gnulib module: log10f or log10f-ieee
-Portability problems fixed by Gnulib:
+Portability problems fixed by either Gnulib module @code{log10f} or @code{log10f-ieee}:
@itemize
@item
This function is missing on some platforms:
OSF/1 5.1.
@end itemize
+Portability problems fixed by Gnulib module @code{log10f-ieee}:
+@itemize
+@item
+This function returns a wrong value for a negative argument on some platforms:
+NetBSD 5.1.
+@end itemize
+
Portability problems not fixed by Gnulib:
@itemize
@end itemize
#undef log10f
{
#if HAVE_LOG10F
- /* Work around the OSF/1 5.1 bug. */
- if (x == 0.0f)
- /* Return -Infinity. */
- return -1.0f / 0.0f;
+ if (x <= 0.0f)
+ {
+ /* Work around the OSF/1 5.1 bug. */
+ if (x == 0.0f)
+ /* Return -Infinity. */
+ return -1.0f / 0.0f;
+ /* Work around the NetBSD 5.1 bug. */
+ else /* x < 0.0 */
+ /* Return NaN. */
+ return 0.0f / 0.0f;
+ }
return log10f (x);
#else
return (float) log10 ((double) x);
--- /dev/null
+# log10f-ieee.m4 serial 1
+dnl Copyright (C) 2012 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.
+
+dnl This macro is in a separate file (not in remainder.m4 and not inlined in the
+dnl module description), so that gl_FUNC_LOG10F can test whether 'aclocal' has
+dnl found uses of this macro.
+
+AC_DEFUN([gl_FUNC_LOG10F_IEEE],
+[
+ m4_divert_text([INIT_PREPARE], [gl_log10f_required=ieee])
+ AC_REQUIRE([gl_FUNC_LOG10F])
+])
-# log10f.m4 serial 3
+# log10f.m4 serial 4
dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
AC_DEFUN([gl_FUNC_LOG10F],
[
+ m4_divert_text([DEFAULTS], [gl_log10f_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_LOG10])
*yes) ;;
*) REPLACE_LOG10F=1 ;;
esac
+
+ m4_ifdef([gl_FUNC_LOG10F_IEEE], [
+ if test $gl_log10f_required = ieee && test $REPLACE_LOG10F = 0; then
+ AC_CACHE_CHECK([whether log10f works according to ISO C 99 with IEC 60559],
+ [gl_cv_func_log10f_ieee],
+ [
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $LOGF_LIBM"
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#ifndef __NO_MATH_INLINES
+# define __NO_MATH_INLINES 1 /* for glibc */
+#endif
+#include <math.h>
+/* Compare two numbers with ==.
+ This is a separate function because IRIX 6.5 "cc -O" miscompiles an
+ 'x == x' test. */
+static int
+numeric_equal (float x, float y)
+{
+ return x == y;
+}
+static float dummy (float x) { return 0; }
+int main (int argc, char *argv[])
+{
+ float (*my_log10f) (float) = argc ? log10f : dummy;
+ /* Test log10f(negative).
+ This test fails on NetBSD 5.1. */
+ float y = my_log10f (-1.0f);
+ if (numeric_equal (y, y))
+ return 1;
+ return 0;
+}
+ ]])],
+ [gl_cv_func_log10f_ieee=yes],
+ [gl_cv_func_log10f_ieee=no],
+ [gl_cv_func_log10f_ieee="guessing no"])
+ LIBS="$save_LIBS"
+ ])
+ case "$gl_cv_func_log10f_ieee" in
+ *yes) ;;
+ *) REPLACE_LOG10F=1 ;;
+ esac
+ fi
+ ])
else
HAVE_LOG10F=0
fi
log10f() function according to ISO C 99 with IEC 60559.
Files:
+m4/log10f-ieee.m4
Depends-on:
log10f
log10-ieee [test $HAVE_LOG10F = 0 || test $REPLACE_LOG10F = 1]
configure.ac:
-AC_REQUIRE([gl_FUNC_LOG10F])
+gl_FUNC_LOG10F_IEEE
Makefile.am: