-# round.m4 serial 6
-dnl Copyright (C) 2007, 2009, 2010 Free Software Foundation, Inc.
+# round.m4 serial 9
+dnl Copyright (C) 2007, 2009-2010 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.
AC_CHECK_DECLS([round], , , [#include <math.h>])
if test "$ac_cv_have_decl_round" = yes; then
gl_CHECK_MATH_LIB([ROUND_LIBM], [x = round (x);])
- fi
- if test "$ac_cv_have_decl_round" = yes && test "$ROUND_LIBM" != missing; then
- dnl Test whether round() produces correct results. On NetBSD 3.0, for
- dnl x = 1/2 - 2^-54, the system's round() returns a wrong result.
- AC_REQUIRE([AC_PROG_CC])
- AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
- AC_CACHE_CHECK([whether round works], [gl_cv_func_round_works],
- [
- save_LIBS="$LIBS"
- LIBS="$LIBS $ROUND_LIBM"
- AC_RUN_IFELSE([AC_LANG_SOURCE([[
+ if test "$ROUND_LIBM" != missing; then
+ 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 $ROUND_LIBM"
+ AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <float.h>
#include <math.h>
int main()
volatile double x = 0.5 - 0.5 / TWO_MANT_DIG;
exit (x < 0.5 && round (x) != 0.0);
}]])], [gl_cv_func_round_works=yes], [gl_cv_func_round_works=no],
- [case "$host_os" in
- netbsd*) gl_cv_func_round_works="guessing no";;
- *) gl_cv_func_round_works="guessing yes";;
- esac
+ [case "$host_os" in
+ netbsd* | aix*) gl_cv_func_round_works="guessing no";;
+ *) gl_cv_func_round_works="guessing yes";;
+ esac
+ ])
+ LIBS="$save_LIBS"
])
- LIBS="$save_LIBS"
- ])
- case "$gl_cv_func_round_works" in
- *no) ROUND_LIBM=missing ;;
- esac
+ case "$gl_cv_func_round_works" in
+ *no) ROUND_LIBM=missing ;;
+ esac
+ fi
+ if test "$ROUND_LIBM" = missing; then
+ REPLACE_ROUND=1
+ fi
+ else
+ HAVE_DECL_ROUND=0
fi
- if test "$ac_cv_have_decl_round" != yes || test "$ROUND_LIBM" = missing; then
- REPLACE_ROUND=1
+ if test $HAVE_DECL_ROUND = 0 || test $REPLACE_ROUND = 1; then
AC_LIBOBJ([round])
gl_FUNC_FLOOR_LIBS
gl_FUNC_CEIL_LIBS
- ROUND_LIBM="$FLOOR_LIBM $CEIL_LIBM"
+ 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])
])