Mercurial > gnulib
view m4/round.m4 @ 17363:5a51fb7777a9
sys_select, sys_time: port 2013-01-30 Solaris 2.6 fix to Cygwin
Problem reported by Marco Atzeri in
<http://lists.gnu.org/archive/html/bug-gnulib/2013-03/msg00000.html>.
* lib/sys_select.in.h [HAVE_SYS_SELECT_H && _CYGWIN_SYS_TIME_H]:
Simply delegate to the system <sys/select.h> in this case too.
Also, pay attention to _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H only
if OSF/1, since otherwise Cygwin breaks, and it doesn't seem to
be needed on Solaris either.
* lib/sys_time.in.h [_CYGWIN_SYS_TIME_H]:
Simply delgate to the system <sys/time.h> in this case.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Tue, 19 Mar 2013 09:08:47 -0700 |
parents | e542fd46ad6f |
children | 344018b6e5d7 |
line wrap: on
line source
# round.m4 serial 16 dnl Copyright (C) 2007, 2009-2013 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. AC_DEFUN([gl_FUNC_ROUND], [ m4_divert_text([DEFAULTS], [gl_round_required=plain]) AC_REQUIRE([gl_MATH_H_DEFAULTS]) dnl Persuade glibc <math.h> to declare round(). AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) gl_CHECK_MATH_LIB([ROUND_LIBM], [x = round (x);], [extern #ifdef __cplusplus "C" #endif double round (double); ]) if test "$ROUND_LIBM" != missing; then HAVE_ROUND=1 dnl Also check whether it's declared. dnl IRIX 6.5 has round() in libm but doesn't declare it in <math.h>. AC_CHECK_DECLS([round], , [HAVE_DECL_ROUND=0], [[#include <math.h>]]) dnl Test whether round() produces correct results. On NetBSD 3.0, for dnl x = 1/2 - 2^-54, the system's round() returns a wrong result. AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether round works], [gl_cv_func_round_works], [ save_LIBS="$LIBS" LIBS="$LIBS $ROUND_LIBM" AC_RUN_IFELSE([AC_LANG_SOURCE([[ #include <float.h> #include <math.h> extern #ifdef __cplusplus "C" #endif double round (double); #ifdef _MSC_VER # pragma fenv_access (off) #endif int main() { /* 2^DBL_MANT_DIG. */ static const double TWO_MANT_DIG = /* Assume DBL_MANT_DIG <= 5 * 31. Use the identity n = floor(n/5) + floor((n+1)/5) + ... + floor((n+4)/5). */ (double) (1U << (DBL_MANT_DIG / 5)) * (double) (1U << ((DBL_MANT_DIG + 1) / 5)) * (double) (1U << ((DBL_MANT_DIG + 2) / 5)) * (double) (1U << ((DBL_MANT_DIG + 3) / 5)) * (double) (1U << ((DBL_MANT_DIG + 4) / 5)); volatile double x = 0.5 - 0.5 / TWO_MANT_DIG; exit (x < 0.5 && round (x) != 0.0); }]])], [gl_cv_func_round_works=yes], [gl_cv_func_round_works=no], [case "$host_os" in netbsd* | aix*) gl_cv_func_round_works="guessing no";; *) gl_cv_func_round_works="guessing yes";; esac ]) LIBS="$save_LIBS" ]) case "$gl_cv_func_round_works" in *no) REPLACE_ROUND=1 ;; esac m4_ifdef([gl_FUNC_ROUND_IEEE], [ if test $gl_round_required = ieee && test $REPLACE_ROUND = 0; then AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether round works according to ISO C 99 with IEC 60559], [gl_cv_func_round_ieee], [ save_LIBS="$LIBS" LIBS="$LIBS $ROUND_LIBM" AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> extern #ifdef __cplusplus "C" #endif double round (double); ]gl_DOUBLE_MINUS_ZERO_CODE[ ]gl_DOUBLE_SIGNBIT_CODE[ static double dummy (double f) { return 0; } int main (int argc, char *argv[]) { double (*my_round) (double) = argc ? round : dummy; /* Test whether round (-0.0) is -0.0. */ if (signbitd (minus_zerod) && !signbitd (my_round (minus_zerod))) return 1; return 0; } ]])], [gl_cv_func_round_ieee=yes], [gl_cv_func_round_ieee=no], [case "$host_os" in # Guess yes on glibc systems. *-gnu*) gl_cv_func_round_ieee="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_round_ieee="guessing no" ;; esac ]) LIBS="$save_LIBS" ]) case "$gl_cv_func_round_ieee" in *yes) ;; *) REPLACE_ROUND=1 ;; esac fi ]) else HAVE_ROUND=0 HAVE_DECL_ROUND=0 fi if test $HAVE_ROUND = 0 || test $REPLACE_ROUND = 1; then dnl Find libraries needed to link lib/round.c. gl_FUNC_FLOOR_LIBS gl_FUNC_CEIL_LIBS ROUND_LIBM= dnl Append $FLOOR_LIBM to ROUND_LIBM, avoiding gratuitous duplicates. case " $ROUND_LIBM " in *" $FLOOR_LIBM "*) ;; *) ROUND_LIBM="$ROUND_LIBM $FLOOR_LIBM" ;; esac dnl Append $CEIL_LIBM to ROUND_LIBM, avoiding gratuitous duplicates. case " $ROUND_LIBM " in *" $CEIL_LIBM "*) ;; *) ROUND_LIBM="$ROUND_LIBM $CEIL_LIBM" ;; esac fi AC_SUBST([ROUND_LIBM]) ])