Detect signed size_t and report an error at configure time.

  o Minor bugfixes

    - Detect broken platforms with a signed size_t, and refuse to

      build there.  Found and analyzed by doorss and rransom.

            [Define to 1 iff time_t is signed])

fi

AC_CACHE_CHECK([whether size_t is signed], tor_cv_size_t_signed, [

AC_RUN_IFELSE(AC_LANG_SOURCE([

#ifdef HAVE_SYS_TYPES_H

#include <sys/types.h>

#endif

int main(int c, char**v) { if (((size_t)-1)<0) return 1; else return 0; }]),

  tor_cv_size_t_signed=no, tor_cv_size_t_signed=yes, tor_cv_size_t_signed=cross)

])

if test "$tor_cv_size_t_signed" = cross; then

  AC_MSG_NOTICE([Cross compiling: assuming that size_t is not signed.])

fi

if test "$tor_cv_size_t_signed" = yes; then

  AC_MSG_ERROR([You have a signed size_t; that's grossly nonconformant.])

fi

AC_CHECK_SIZEOF(socklen_t, , [AC_INCLUDES_DEFAULT()

#ifdef HAVE_SYS_SOCKET_H

#include <sys/socket.h>