-# roundl.m4 serial 8
-dnl Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc.
+# roundl.m4 serial 15
+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.
[
m4_divert_text([DEFAULTS], [gl_roundl_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
dnl Persuade glibc <math.h> to declare roundl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
- AC_CHECK_DECLS([roundl], , , [#include <math.h>])
- if test "$ac_cv_have_decl_roundl" = yes; then
- gl_CHECK_MATH_LIB([ROUNDL_LIBM], [x = roundl (x);])
- if test "$ROUNDL_LIBM" = missing; then
- REPLACE_ROUNDL=1
- fi
+
+ gl_CHECK_MATH_LIB([ROUNDL_LIBM], [x = roundl (x);],
+ [extern
+ #ifdef __cplusplus
+ "C"
+ #endif
+ long double roundl (long double);
+ ])
+ if test "$ROUNDL_LIBM" != missing; then
+ HAVE_ROUNDL=1
+ dnl Also check whether it's declared.
+ dnl IRIX 6.5 has roundl() in libm but doesn't declare it in <math.h>.
+ AC_CHECK_DECLS([roundl], , [HAVE_DECL_ROUNDL=0], [[#include <math.h>]])
+
m4_ifdef([gl_FUNC_ROUNDL_IEEE], [
if test $gl_roundl_required = ieee && test $REPLACE_ROUNDL = 0; then
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether roundl works according to ISO C 99 with IEC 60559],
[gl_cv_func_roundl_ieee],
[
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
+extern
+#ifdef __cplusplus
+"C"
+#endif
+long double roundl (long double);
]gl_LONG_DOUBLE_MINUS_ZERO_CODE[
]gl_LONG_DOUBLE_SIGNBIT_CODE[
-int main()
+static long double dummy (long double f) { return 0; }
+int main (int argc, char *argv[])
{
+ long double (*my_roundl) (long double) = argc ? roundl : dummy;
+ int result = 0;
/* Test whether roundl (-0.0L) is -0.0L. */
- if (signbitl (minus_zerol) && !signbitl (roundl (minus_zerol)))
- return 1;
- return 0;
+ if (signbitl (minus_zerol) && !signbitl (my_roundl (minus_zerol)))
+ result |= 1;
+ /* Test whether roundl (-0.3L) is -0.0L. */
+ if (signbitl (-0.3L) && !signbitl (my_roundl (-0.3L)))
+ result |= 2;
+ return result;
}
]])],
[gl_cv_func_roundl_ieee=yes],
[gl_cv_func_roundl_ieee=no],
- [gl_cv_func_roundl_ieee="guessing no"])
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_roundl_ieee="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_roundl_ieee="guessing no" ;;
+ esac
+ ])
LIBS="$save_LIBS"
])
case "$gl_cv_func_roundl_ieee" in
fi
])
else
+ HAVE_ROUNDL=0
HAVE_DECL_ROUNDL=0
fi
- if test $HAVE_DECL_ROUNDL = 0 || test $REPLACE_ROUNDL = 1; then
- AC_LIBOBJ([roundl])
- AC_CHECK_DECLS([ceill, floorl], , , [#include <math.h>])
- if test "$ac_cv_have_decl_floorl" = yes \
- && test "$ac_cv_have_decl_ceill" = yes; then
- gl_FUNC_FLOORL_LIBS
- gl_FUNC_CEILL_LIBS
- if test "$FLOORL_LIBM" != '?' && test "$CEILL_LIBM" != '?'; then
- AC_DEFINE([HAVE_FLOORL_AND_CEILL], [1],
- [Define if the both the floorl() and ceill() functions exist.])
- ROUNDL_LIBM=
- dnl Append $FLOORL_LIBM to ROUNDL_LIBM, avoiding gratuitous duplicates.
- case " $ROUNDL_LIBM " in
- *" $FLOORL_LIBM "*) ;;
- *) ROUNDL_LIBM="$ROUNDL_LIBM $FLOORL_LIBM" ;;
- esac
- dnl Append $CEILL_LIBM to ROUNDL_LIBM, avoiding gratuitous duplicates.
- case " $ROUNDL_LIBM " in
- *" $CEILL_LIBM "*) ;;
- *) ROUNDL_LIBM="$ROUNDL_LIBM $CEILL_LIBM" ;;
- esac
+ if test $HAVE_ROUNDL = 0 || test $REPLACE_ROUNDL = 1; then
+ dnl Find libraries needed to link lib/roundl.c.
+ if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+ AC_REQUIRE([gl_FUNC_ROUND])
+ ROUNDL_LIBM="$ROUND_LIBM"
+ else
+ AC_CHECK_DECLS([ceill, floorl], , , [[#include <math.h>]])
+ if test "$ac_cv_have_decl_floorl" = yes \
+ && test "$ac_cv_have_decl_ceill" = yes; then
+ gl_FUNC_FLOORL_LIBS
+ gl_FUNC_CEILL_LIBS
+ if test "$FLOORL_LIBM" != '?' && test "$CEILL_LIBM" != '?'; then
+ AC_DEFINE([HAVE_FLOORL_AND_CEILL], [1],
+ [Define if the both the floorl() and ceill() functions exist.])
+ ROUNDL_LIBM=
+ dnl Append $FLOORL_LIBM to ROUNDL_LIBM, avoiding gratuitous duplicates.
+ case " $ROUNDL_LIBM " in
+ *" $FLOORL_LIBM "*) ;;
+ *) ROUNDL_LIBM="$ROUNDL_LIBM $FLOORL_LIBM" ;;
+ esac
+ dnl Append $CEILL_LIBM to ROUNDL_LIBM, avoiding gratuitous duplicates.
+ case " $ROUNDL_LIBM " in
+ *" $CEILL_LIBM "*) ;;
+ *) ROUNDL_LIBM="$ROUNDL_LIBM $CEILL_LIBM" ;;
+ esac
+ else
+ ROUNDL_LIBM=
+ fi
else
ROUNDL_LIBM=
fi
- else
- ROUNDL_LIBM=
fi
fi
AC_SUBST([ROUNDL_LIBM])