2012-02-27 Bruno Haible <bruno@clisp.org>
+ fmodl-ieee: Work around test failures on OSF/1, MSVC 9.
+ * m4/fmodl-ieee.m4: New file.
+ * m4/fmodl.m4 (gl_FUNC_FMODL): If gl_FUNC_FMODL_IEEE is present, test
+ whether fmodl works with zero arguments. Replace it if not.
+ * modules/fmodl-ieee (Files): Add m4/fmodl-ieee.m4.
+ (Depends-on): Add fmod-ieee.
+ (configure.ac): Invoke gl_FUNC_FMODL_IEEE.
+ * doc/posix-functions/fmodl.texi: Mention the fmodl-ieee module.
+
fmodf-ieee: Work around test failure on OSF/1.
* m4/fmodf-ieee.m4: New file.
* m4/fmodf.m4 (gl_FUNC_FMODF): If gl_FUNC_FMODF_IEEE is present, test
POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/fmodl.html}
-Gnulib module: fmodl
+Gnulib module: fmodl or fmodl-ieee
-Portability problems fixed by Gnulib:
+Portability problems fixed by either Gnulib module @code{fmodl} or @code{fmodl-ieee}:
@itemize
@item
This function is missing on some platforms:
AIX 5.1.
@end itemize
+Portability problems fixed by Gnulib module @code{fmodl-ieee}:
+@itemize
+@item
+This function has problems when the second argument is zero on some platforms:
+OSF/1 5.1.
+@item
+This function has problems when the first argument is minus zero on some
+platforms:
+MSVC 9.
+@end itemize
+
Portability problems not fixed by Gnulib:
@itemize
@end itemize
--- /dev/null
+# fmodl-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 fmodl.m4 and not inlined in the
+dnl module description), so that gl_FUNC_FMODL can test whether 'aclocal' has
+dnl found uses of this macro.
+
+AC_DEFUN([gl_FUNC_FMODL_IEEE],
+[
+ m4_divert_text([INIT_PREPARE], [gl_fmodl_required=ieee])
+ AC_REQUIRE([gl_FUNC_FMODL])
+])
-# fmodl.m4 serial 1
+# fmodl.m4 serial 2
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_FMODL],
[
+ m4_divert_text([DEFAULTS], [gl_fmodl_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
AC_REQUIRE([gl_FUNC_FMOD])
AC_CHECK_FUNCS([fmodl])
LIBS="$save_LIBS"
if test $ac_cv_func_fmodl = yes; then
- if test $ac_cv_have_decl_fmodl = yes; then
- FMODL_LIBM="$FMOD_LIBM"
- else
+ FMODL_LIBM="$FMOD_LIBM"
+ if test $ac_cv_have_decl_fmodl = no; then
REPLACE_FMODL=1
fi
+ m4_ifdef([gl_FUNC_FMODL_IEEE], [
+ if test $gl_fmodl_required = ieee && test $REPLACE_FMODL = 0; then
+ AC_CACHE_CHECK([whether fmodl works according to ISO C 99 with IEC 60559],
+ [gl_cv_func_fmodl_ieee],
+ [
+ save_LIBS="$LIBS"
+ LIBS="$LIBS $FMODL_LIBM"
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#ifndef __NO_MATH_INLINES
+# define __NO_MATH_INLINES 1 /* for glibc */
+#endif
+#include <math.h>
+/* Compare two numbers with ==.
+ This is a separate function because IRIX 6.5 "cc -O" miscompiles an
+ 'x == x' test. */
+static int
+numeric_equal (long double x, long double y)
+{
+ return x == y;
+}
+static long double dummy (long double x, long double y) { return 0; }
+int main (int argc, char *argv[])
+{
+ long double (*my_fmodl) (long double, long double) = argc ? fmodl : dummy;
+ long double i;
+ long double f;
+ /* Test fmodl(...,0.0L).
+ This test fails on OSF/1 5.1. */
+ f = my_fmodl (2.0L, 0.0L);
+ if (numeric_equal (f, f))
+ return 1;
+ return 0;
+}
+ ]])],
+ [gl_cv_func_fmodl_ieee=yes],
+ [gl_cv_func_fmodl_ieee=no],
+ [gl_cv_func_fmodl_ieee="guessing no"])
+ LIBS="$save_LIBS"
+ ])
+ case "$gl_cv_func_fmodl_ieee" in
+ *yes) ;;
+ *) REPLACE_FMODL=1 ;;
+ esac
+ fi
+ ])
else
HAVE_FMODL=0
fi
if test $HAVE_FMODL = 0 || test $REPLACE_FMODL = 1; then
+ dnl Find libraries needed to link lib/fmodl.c.
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
FMODL_LIBM="$FMOD_LIBM"
else