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| author | Bruno Haible <bruno@clisp.org> | 2010-12-21 18:30:16 +0100 |
|---|---|---|
| committer | Bruno Haible <bruno@clisp.org> | 2010-12-21 22:48:06 +0100 |
| commit | 0c5e7922f80eae16b5a89233d5a8c0d1f88c18a7 (patch) | |
| tree | 8f3671c7f491de635c3139015ed6ef44646249d4 /m4/trunc.m4 | |
| parent | 4b7ece979775e13ba4f1db1e6d9cfe400eff0f01 (diff) | |
| download | gnulib-0c5e7922f80eae16b5a89233d5a8c0d1f88c18a7.tar.gz | |
New module 'trunc-ieee'.
* modules/trunc-ieee: New file.
* m4/trunc.m4 (gl_FUNC_TRUNC): If gl_FUNC_TRUNC_IEEE is also used, test
whether trunc works according to ISO C 99 with IEC 60559.
* m4/trunc-ieee.m4: New file.
* lib/math.in.h (trunc): Replace if REPLACE_TRUNC is set.
* m4/math_h.m4 (gl_MATH_H_DEFAULTS): Initialize REPLACE_TRUNC.
* modules/math (Makefile.am): Substitute REPLACE_TRUNC.
* modules/trunc-ieee-tests: New file.
* tests/test-trunc-ieee.c: New file, based on tests/test-truncf-ieee.c.
* tests/test-trunc1.c (main): Remove signbit tests.
* modules/trunc-tests (Depends-on): Remove 'signbit'.
* doc/posix-functions/trunc.texi: Mention the new module.
Diffstat (limited to 'm4/trunc.m4')
| -rw-r--r-- | m4/trunc.m4 | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/m4/trunc.m4 b/m4/trunc.m4 index 0654d9cd21..6197df5217 100644 --- a/m4/trunc.m4 +++ b/m4/trunc.m4 @@ -1,4 +1,4 @@ -# trunc.m4 serial 4 +# trunc.m4 serial 5 dnl Copyright (C) 2007, 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_TRUNC], [ + m4_divert_text([DEFAULTS], [gl_trunc_required=plain]) AC_REQUIRE([gl_MATH_H_DEFAULTS]) dnl Persuade glibc <math.h> to declare trunc(). AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) @@ -40,8 +41,44 @@ AC_DEFUN([gl_FUNC_TRUNC], if test "$TRUNC_LIBM" = "?"; then TRUNC_LIBM= fi + m4_ifdef([gl_FUNC_TRUNC_IEEE], [ + if test $gl_trunc_required = ieee && test $REPLACE_TRUNC = 0; then + AC_CACHE_CHECK([whether trunc works according to ISO C 99 with IEC 60559], + [gl_cv_func_trunc_ieee], + [ + save_LIBS="$LIBS" + LIBS="$LIBS $TRUNC_LIBM" + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#ifndef __NO_MATH_INLINES +# define __NO_MATH_INLINES 1 /* for glibc */ +#endif +#include <math.h> +]gl_DOUBLE_MINUS_ZERO_CODE[ +]gl_DOUBLE_SIGNBIT_CODE[ +int main() +{ + /* Test whether trunc (-0.0) is -0.0. */ + if (signbitd (minus_zerod) && !signbitd (trunc (minus_zerod))) + return 1; + return 0; +} + ]])], + [gl_cv_func_trunc_ieee=yes], + [gl_cv_func_trunc_ieee=no], + [gl_cv_func_trunc_ieee="guessing no"]) + LIBS="$save_LIBS" + ]) + case "$gl_cv_func_trunc_ieee" in + *yes) ;; + *) REPLACE_TRUNC=1 ;; + esac + fi + ]) else HAVE_DECL_TRUNC=0 + fi + if test $HAVE_DECL_TRUNC = 0 || test $REPLACE_TRUNC = 1; then AC_LIBOBJ([trunc]) TRUNC_LIBM= fi |