From dcfdd254dc3d43139dc4058521287a48753b7db3 Mon Sep 17 00:00:00 2001 From: Bruno Haible Date: Sat, 25 Dec 2010 12:06:28 +0100 Subject: [PATCH] truncl-ieee: Make it work on OSF/1 5.1 with cc. * doc/posix-functions/truncl.texi: Mention the OSF/1 5.1 bug. * m4/truncl.m4 (gl_FUNC_TRUNCL): If gl_FUNC_TRUNCL_IEEE is also used, test whether truncl works according to ISO C 99 with IEC 60559. * m4/truncl-ieee.m4: New file. * modules/truncl-ieee (Files): Add it and m4/minus-zero.m4, m4/signbit.m4. (configure.ac): Invoke gl_FUNC_TRUNCL_IEEE. --- ChangeLog | 11 +++++++++++ doc/posix-functions/truncl.texi | 10 +++++++++- m4/truncl-ieee.m4 | 15 +++++++++++++++ m4/truncl.m4 | 37 ++++++++++++++++++++++++++++++++++++- modules/truncl-ieee | 4 ++++ 5 files changed, 75 insertions(+), 2 deletions(-) create mode 100644 m4/truncl-ieee.m4 diff --git a/ChangeLog b/ChangeLog index 6e5444d23..8785d1680 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,16 @@ 2010-12-25 Bruno Haible + truncl-ieee: Make it work on OSF/1 5.1 with cc. + * doc/posix-functions/truncl.texi: Mention the OSF/1 5.1 bug. + * m4/truncl.m4 (gl_FUNC_TRUNCL): If gl_FUNC_TRUNCL_IEEE is also used, + test whether truncl works according to ISO C 99 with IEC 60559. + * m4/truncl-ieee.m4: New file. + * modules/truncl-ieee (Files): Add it and m4/minus-zero.m4, + m4/signbit.m4. + (configure.ac): Invoke gl_FUNC_TRUNCL_IEEE. + +2010-12-25 Bruno Haible + ceill-ieee: Make it work on OSF/1 5.1 with cc. * doc/posix-functions/ceill.texi: Mention the OSF/1 5.1 bug. * m4/ceill.m4 (gl_FUNC_CEILL): If gl_FUNC_CEILL_IEEE is also used, diff --git a/doc/posix-functions/truncl.texi b/doc/posix-functions/truncl.texi index 442704ec0..616854ee5 100644 --- a/doc/posix-functions/truncl.texi +++ b/doc/posix-functions/truncl.texi @@ -6,7 +6,7 @@ POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/funct Gnulib module: truncl or truncl-ieee -Portability problems fixed by Gnulib: +Portability problems fixed by either Gnulib module @code{truncl} or @code{truncl-ieee}: @itemize @item This function is missing on some platforms: @@ -19,6 +19,14 @@ This function crashes on some platforms: OSF/1 4.0. @end itemize +Portability problems fixed by Gnulib module @code{truncl-ieee}: +@itemize +@item +This function returns a positive zero for an argument between -1 and 0 +on some platforms: +OSF/1 5.1. +@end itemize + Portability problems not fixed by Gnulib: @itemize @end itemize diff --git a/m4/truncl-ieee.m4 b/m4/truncl-ieee.m4 new file mode 100644 index 000000000..a5ca6cb80 --- /dev/null +++ b/m4/truncl-ieee.m4 @@ -0,0 +1,15 @@ +# truncl-ieee.m4 serial 1 +dnl Copyright (C) 2010 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 truncl.m4 and not inlined in the +dnl module description), so that gl_FUNC_TRUNCL can test whether 'aclocal' has +dnl found uses of this macro. + +AC_DEFUN([gl_FUNC_TRUNCL_IEEE], +[ + m4_divert_text([INIT_PREPARE], [gl_truncl_required=ieee]) + AC_REQUIRE([gl_FUNC_TRUNCL]) +]) diff --git a/m4/truncl.m4 b/m4/truncl.m4 index 583ca1359..e05c2d680 100644 --- a/m4/truncl.m4 +++ b/m4/truncl.m4 @@ -1,4 +1,4 @@ -# truncl.m4 serial 5 +# truncl.m4 serial 6 dnl Copyright (C) 2007-2008, 2010 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -6,6 +6,7 @@ dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_TRUNCL], [ + m4_divert_text([DEFAULTS], [gl_truncl_required=plain]) AC_REQUIRE([gl_MATH_H_DEFAULTS]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles dnl Persuade glibc to declare truncl(). @@ -68,6 +69,40 @@ int main() *yes) ;; *) REPLACE_TRUNCL=1 ;; esac + m4_ifdef([gl_FUNC_TRUNCL_IEEE], [ + if test $gl_truncl_required = ieee && test $REPLACE_TRUNCL = 0; then + AC_CACHE_CHECK([whether truncl works according to ISO C 99 with IEC 60559], + [gl_cv_func_truncl_ieee], + [ + save_LIBS="$LIBS" + LIBS="$LIBS $TRUNCL_LIBM" + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#ifndef __NO_MATH_INLINES +# define __NO_MATH_INLINES 1 /* for glibc */ +#endif +#include +]gl_LONG_DOUBLE_MINUS_ZERO_CODE[ +]gl_LONG_DOUBLE_SIGNBIT_CODE[ +int main() +{ + /* Test whether truncl (-0.3L) is -0.0L. */ + if (signbitl (minus_zerol) && !signbitl (truncl (-0.3L))) + return 1; + return 0; +} + ]])], + [gl_cv_func_truncl_ieee=yes], + [gl_cv_func_truncl_ieee=no], + [gl_cv_func_truncl_ieee="guessing no"]) + LIBS="$save_LIBS" + ]) + case "$gl_cv_func_truncl_ieee" in + *yes) ;; + *) REPLACE_TRUNCL=1 ;; + esac + fi + ]) else HAVE_DECL_TRUNCL=0 fi diff --git a/modules/truncl-ieee b/modules/truncl-ieee index b3acf18bb..0dc1f7b69 100644 --- a/modules/truncl-ieee +++ b/modules/truncl-ieee @@ -2,11 +2,15 @@ Description: truncl() function according to ISO C 99 with IEC 60559. Files: +m4/truncl-ieee.m4 +m4/minus-zero.m4 +m4/signbit.m4 Depends-on: truncl configure.ac: +gl_FUNC_TRUNCL_IEEE Makefile.am: -- 2.11.0