-# truncf.m4 serial 5
+# truncf.m4 serial 8
dnl Copyright (C) 2007, 2010-2011 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 Persuade glibc <math.h> to declare truncf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether truncf() is declared.
- AC_CHECK_DECLS([truncf], , , [#include <math.h>])
+ AC_CHECK_DECLS([truncf], , , [[#include <math.h>]])
if test "$ac_cv_have_decl_truncf" = yes; then
dnl Test whether truncf() can be used without libm.
TRUNCF_LIBM=?
#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_truncf) (float) = argc ? truncf : dummy;
/* Test whether truncf (-0.0f) is -0.0f. */
- if (signbitf (minus_zerof) && !signbitf (truncf (minus_zerof)))
+ if (signbitf (minus_zerof) && !signbitf (my_truncf (minus_zerof)))
return 1;
return 0;
}