= Common Porting Problems =

This page serves to collect information about common problems encountered when porting applications/libraries to the Haiku/BeOS platform. The problems should be identified by the (compiler) errors that typify them.

Information about BeOS's POSIX compatibility, see [wiki:BeOSPosix].

=== no undefined references allowed in i586-pc-beos shared libraries ===

ports: [wiki:dev-util/subversion], [wiki:dev-libs/apr]

You need to pass the {{{-no-undefined}}} option to libtool

Alternatively, libtool can be patched to always exhibit this behavior, at the risk of breaking static compilation when dynamic linking fails. -- andreasf

=== (stat) structure has no member named `st_blocks' (Now fixed in Haiku) ===

ports: [wiki:app-arch/tar] (make check), [wiki:net-fs/samba], [wiki:dev-util/cvs]

The stat struct in sys/stat.h in BeOS ~~and Haiku~~ ([http://dev.haiku-os.org/ticket/2261 Haiku now has it] [http://dev.haiku-os.org/changeset/27791 as seen here]) doesn't have an st_blocks member. In projects with autoconf, you can check for HAVE_STAT_ST_BLOCKS.

http://lists.samba.org/archive/samba-technical/2005-January/039275.html

=== -lm ===

ports: [wiki:dev-lang/lua], others

The -lm refers to libm which isn't needed for Haiku or BeOS as the math library is part of libroot and linked by default

Please DO NOT create a shortcut of libroot.so and rename to libm.so on gcc4 and gcc2 lib directory (Haiku hybrids case) or change the -lm references in the configure file to -lroot.
If the port is using the autotools chances are this can be fixed by doing an AC_CHECK_LIB for cos in m and then setting a variable such as LIBM or MLIB to by ="-lm" if true or "" if not.

Here is some explanation:
http://www.freelists.org/archives/haiku-development/04-2008/msg00904.html

=== -lc ===

This sometimes turns up, and I think it is due to the port using an older libtool.  Try running libtoolize --force --copy --install, aclocal, autoconf and automake before ./configure to see if that clears it up.

=== conflicting types for `restrict' (Now fixed in Haiku) ===

/boot/develop/headers/posix/search.h:35: conflicting types for `restrict'
/boot/develop/headers/posix/search.h:35: previous declaration of `restrict'
This seems to be an issue with Haiku and has been reported [http://dev.haiku-os.org/ticket/2262 Haiku-2262]
This has been fixed in Haiku.  If using a version  prior to the fix you can copy the search.h file over the one in your headers/posix folder.

=== GCC 2.9 related build problems ===

output_operand_lossage `invalid expression as operand'

This can be avoided by not passing the '-g' option to gcc for this test.


=== GCC 4.3 related build problems ===

Typical errors look like these:

error: 'find' is not a member of 'std'

error: 'exit' was not declared in this scope

Please take a look at: http://www.cyrius.com/journal/2007/05/10#gcc-4.3-include

or

http://www.comp.leeds.ac.uk/hannah/cpp/errors.html

=== MSG_NOSIGNAL undeclared ===

Add below to header/source file.

{{{
#ifndef MSG_NOSIGNAL 
#define MSG_NOSIGNAL 0 
#endif
}}}

=== FNDELAY undeclared ===

Add below to header/source file.

{{{
#ifndef FNDELAY
#define FNDELAY O_NONBLOCK 
#endif
}}}

=== O_NOATIME undeclared ===

Add below to header/source file.

{{{
#include <fcntl.h>
#ifndef _GNU_SOURCE
#define _GNU_SOURCE // for O_NOATIME
#define O_NOATIME 01000000
#endif
}}}


=== stdbool.in.h (Now fixed in Haiku) ===

This has been fixed: http://ports.haiku-files.org/wiki/dev-libs/gnulib
So any releases posted AFTER May 25, 2008 'should' include an updated stdbool.in.h

=== iconv (Now fixed in Haiku)) ===

Iconv is included in Haiku, but many times ./configure does not detect and use it.  This is because it is in libtextencoding.so ([http://dev.haiku-os.org/ticket/2294 should be fixed now]).  So try adding a check for iconv in libtextextencoding and see if that works.

=== Cannot find socket libraries ===

The socket functionalities are provided in Haiku's libnetwork.  The proper fix for this is to patch Configure to check that library as well. This is an example patch of libevent.
{{{
diff -Naur libevent-1.4.13-stable/configure.in libevent-1.4.13-stable-haiku/configure.in
--- libevent-1.4.13-stable/configure.in	2009-05-24 13:37:49.000000000 +0000
+++ libevent-1.4.13-stable-haiku/configure.in	2009-05-28 16:55:17.000000000 +0000
@@ -33,7 +33,7 @@
 AC_SUBST(LIBTOOL_DEPS)

 dnl Checks for libraries.
-AC_CHECK_LIB(socket, socket)
+AC_SEARCH_LIBS(socket, socket network)
 AC_CHECK_LIB(resolv, inet_aton)
 AC_CHECK_LIB(rt, clock_gettime)
 AC_CHECK_LIB(nsl, inet_ntoa)
}}}


=== DT_DIR undeclared ===

The use of DT_DIR doesn't work on non-ext* filesystems

So replace for

{{{
#ifndef DT_DIR
/* dirent.d_type is a BSD extension, not part of POSIX */
#include <sys/stat.h>
#include <string.h>

static int
is_dir (const char *path, const char *name)
{
  int len1 = strlen(path);
  int len2 = strlen(name);

  char pathname[len1 + 1 + len2 + 1 + 13];
  strcpy (pathname, path);

  /* Avoid UNC-path "//name" on Cygwin.  */
  if (len1 > 0 && pathname[len1 - 1] != '/')
    strcat (pathname, "/");

  strcat (pathname, name);

  struct stat st;
  if (stat (pathname, &st))
    return 0;
  return S_ISDIR (st.st_mode);
}
#endif
}}}

And after a check function

{{{
info.dir = !! is_dir (path, de->d_name);
}}}