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remainderl: Bypass broken implementation in OpenBSD 5.1/SPARC.

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* m4/remainderl.m4 (gl_FUNC_REMAINDERL_WORKS): New macro.
(gl_FUNC_REMAINDERL): Invoke it. If the function does not work, set
REPLACE_REMAINDERL to 1.
* doc/posix-functions/remainderl.texi: Mention the OpenBSD 5.1/SPARC
bug.
This commit is contained in:
Bruno Haible
2012-03-14 02:40:49 +01:00
parent 689d4cc536
commit 77d42cc5aa
3 changed files with 66 additions and 1 deletions
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9
ChangeLog
View File

@@ -1,3 +1,12 @@
2012-03-13 Bruno Haible <bruno@clisp.org>
remainderl: Bypass broken implementation in OpenBSD 5.1/SPARC.
* m4/remainderl.m4 (gl_FUNC_REMAINDERL_WORKS): New macro.
(gl_FUNC_REMAINDERL): Invoke it. If the function does not work, set
REPLACE_REMAINDERL to 1.
* doc/posix-functions/remainderl.texi: Mention the OpenBSD 5.1/SPARC
bug.
2012-03-13 Bruno Haible <bruno@clisp.org> 2012-03-13 Bruno Haible <bruno@clisp.org>
sqrtl: Bypass broken implementation in OpenBSD 5.1/SPARC. sqrtl: Bypass broken implementation in OpenBSD 5.1/SPARC.

3
doc/posix-functions/remainderl.texi
View File

@@ -14,6 +14,9 @@ FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11, older IRIX
@item @item
This function is not declared on some platforms: This function is not declared on some platforms:
IRIX 6.5. IRIX 6.5.
@item
This function returns completely wrong values on some platforms:
OpenBSD 5.1/SPARC.
@end itemize @end itemize
Portability problems fixed by Gnulib module @code{remainderl-ieee}: Portability problems fixed by Gnulib module @code{remainderl-ieee}:

55
m4/remainderl.m4
View File

@@ -1,4 +1,4 @@
# remainderl.m4 serial 5 # remainderl.m4 serial 6
dnl Copyright (C) 2012 Free Software Foundation, Inc. dnl Copyright (C) 2012 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it, dnl gives unlimited permission to copy and/or distribute it,
@@ -47,6 +47,16 @@ AC_DEFUN([gl_FUNC_REMAINDERL],
dnl Also check whether it's declared. dnl Also check whether it's declared.
dnl IRIX 6.5 has remainderl() in libm but doesn't declare it in <math.h>. dnl IRIX 6.5 has remainderl() in libm but doesn't declare it in <math.h>.
AC_CHECK_DECLS([remainderl], , [HAVE_DECL_REMAINDERL=0], [[#include <math.h>]]) AC_CHECK_DECLS([remainderl], , [HAVE_DECL_REMAINDERL=0], [[#include <math.h>]])
save_LIBS="$LIBS"
LIBS="$LIBS $REMAINDERL_LIBM"
gl_FUNC_REMAINDERL_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_remainderl_works" in
*yes) ;;
*) REPLACE_REMAINDERL=1 ;;
esac
m4_ifdef([gl_FUNC_REMAINDERL_IEEE], [ m4_ifdef([gl_FUNC_REMAINDERL_IEEE], [
if test $gl_remainderl_required = ieee && test $REPLACE_REMAINDERL = 0; then if test $gl_remainderl_required = ieee && test $REPLACE_REMAINDERL = 0; then
AC_CACHE_CHECK([whether remainderl works according to ISO C 99 with IEC 60559], AC_CACHE_CHECK([whether remainderl works according to ISO C 99 with IEC 60559],
@@ -129,3 +139,46 @@ int main (int argc, char *argv[])
fi fi
AC_SUBST([REMAINDERL_LIBM]) AC_SUBST([REMAINDERL_LIBM])
]) ])
dnl Test whether remainderl() works.
dnl It produces completely wrong values on OpenBSD 5.1/SPARC.
AC_DEFUN([gl_FUNC_REMAINDERL_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether remainderl works], [gl_cv_func_remainderl_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
extern
#ifdef __cplusplus
"C"
#endif
long double remainderl (long double, long double);
volatile long double x;
volatile long double y;
long double z;
int main ()
{
/* This test fails on OpenBSD 5.1/SPARC. */
x = 9.245907126L;
y = 3.141592654L;
z = remainderl (x, y);
if (z >= 0.0L)
return 1;
return 0;
}
]])],
[gl_cv_func_remainderl_works=yes],
[gl_cv_func_remainderl_works=no],
[case "$host_os" in
openbsd*) gl_cv_func_remainderl_works="guessing no";;
*) gl_cv_func_remainderl_works="guessing yes";;
esac
])
])
])