-# floorf.m4 serial 8
-dnl Copyright (C) 2007, 2009-2010 Free Software Foundation, Inc.
+# floorf.m4 serial 13
+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 floorf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether floorf() is declared.
- AC_CHECK_DECLS([floorf], , , [#include <math.h>])
+ AC_CHECK_DECLS([floorf], , , [[#include <math.h>]])
if test "$ac_cv_have_decl_floorf" = yes; then
dnl Test whether floorf() can be used without libm.
gl_FUNC_FLOORF_LIBS
fi
m4_ifdef([gl_FUNC_FLOORF_IEEE], [
if test $gl_floorf_required = ieee && test $REPLACE_FLOORF = 0; then
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether floorf works according to ISO C 99 with IEC 60559],
[gl_cv_func_floorf_ieee],
[
#include <math.h>
]gl_FLOAT_MINUS_ZERO_CODE[
]gl_FLOAT_SIGNBIT_CODE[
-int main()
+static float dummy (float f) { return 0; }
+int main (int argc, char *argv[])
{
+ float (*my_floorf) (float) = argc ? floorf : dummy;
/* Test whether floorf (-0.0f) is -0.0f. */
- if (signbitf (minus_zerof) && !signbitf (floorf (minus_zerof)))
+ if (signbitf (minus_zerof) && !signbitf (my_floorf (minus_zerof)))
return 1;
return 0;
}
]])],
[gl_cv_func_floorf_ieee=yes],
[gl_cv_func_floorf_ieee=no],
- [gl_cv_func_floorf_ieee="guessing no"])
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_floorf_ieee="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_floorf_ieee="guessing no" ;;
+ esac
+ ])
LIBS="$save_LIBS"
])
case "$gl_cv_func_floorf_ieee" in
HAVE_DECL_FLOORF=0
fi
if test $HAVE_DECL_FLOORF = 0 || test $REPLACE_FLOORF = 1; then
- AC_LIBOBJ([floorf])
+ dnl No libraries are needed to link lib/floorf.c.
FLOORF_LIBM=
fi
AC_SUBST([FLOORF_LIBM])
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
+ float (*funcptr) (float) = floorf;
float x;]],
- [[x = floorf(x);]])],
+ [[x = funcptr(x) + floorf(x);]])],
[gl_cv_func_floorf_libm=])
if test "$gl_cv_func_floorf_libm" = "?"; then
save_LIBS="$LIBS"
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
+ float (*funcptr) (float) = floorf;
float x;]],
- [[x = floorf(x);]])],
+ [[x = funcptr(x) + floorf(x);]])],
[gl_cv_func_floorf_libm="-lm"])
LIBS="$save_LIBS"
fi