-# roundl.m4 serial 13
-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.
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 $REPLACE_ROUNDL = 0; then
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether roundl works according to ISO C 99 with IEC 60559],
[gl_cv_func_roundl_ieee],
[
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
+extern
+#ifdef __cplusplus
+"C"
+#endif
+long double roundl (long double);
]gl_LONG_DOUBLE_MINUS_ZERO_CODE[
]gl_LONG_DOUBLE_SIGNBIT_CODE[
static long double dummy (long double f) { return 0; }
]])],
[gl_cv_func_roundl_ieee=yes],
[gl_cv_func_roundl_ieee=no],
- [gl_cv_func_roundl_ieee="guessing no"])
+ [case "$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
+ 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])