source: trunk/doc/ReleaseNotes.os2@ 1736

    R e l e a s e    N o t e s    G C C   f o r   O S / 2
    +----------------------------------------------------+


(C)'2003-2004 InnoTek Systemberatung GmbH
http://www.innotek.de
(C)'2004 Knut St. Osmundsen


GCC v3.3.5 / LIBC v0.6 - Beta 2:
--------------------------------

    New features:

        o wchar.h and wctype.h and much of the non-stream functions
          declared therein are implemented. Though, the FreeBSD
                  string/w*.c functions are still in the porting queue.

        o Added __mcount stub to all LIBC DLLs but the .prf one which
          is forwarding __mcount from kProfile.dll.

        o DosLoadModuleEx and DosFreeModuleEx was created to support
          loaded modules over a fork(). dlopen/dlclose backend was
          changed to use these.

        o Fixed rand() range problem. Using the BSD code for this
          too, which means a new algorithm.

        o Update all BSD source-files (not headers) to FreeBSD 5.3
          level.

        o New functions:
          DosLoadModuleEx(), DosFreeModuleEx(), sranddev(),
          getsubopt(), rand_r(), llabs(), lldiv(), dlfunc(),
          issetugid(), pread(), pwrite(), _UTF8_mbrtowc(),
          _UTF8_mbsinit(), _UTF8_mbsnrtowcs(), _UTF8_wcrtomb(),
          _UTF8_wcsnrtombs(), digittoint(), isideogram(),
          isrune(), iswalnum(), iswalpha(), iswascii(),
          iswblank(), iswcntrl(), iswctype(), iswdigit(),
          iswgraph(), iswhexnumber(), iswideogram(), iswlower(),
          iswnumber(), iswprint(), iswpunct(), iswrune(),
          iswspace(), iswupper(), iswxdigit(), btowc(), mbrlen(),
          mbrtowc(), mbsinit(), mbsnrtowcs(), mbsrtowcs(),
          nl_langinfo(), towctrans(), wcrtomb(), wcsftime(),
          wcsnrtombs(), wcsrtombs(), wcstod(), wcstof(),
          wcstoimax(), wcstol(), wcstold(), wcstoll(), wcstoul(),
          wcstoull(), wcstoumax(), wctob(), wctrans(), wctype(),
          towlower(), towupper().


    Bug fixes:

        o Fixed missing WNOHANG handling in waitpid(), wait4()
          and waitid().

                o Corrected several severe bugs in the path resolver.

                o Fixed handling of paths ending with slash.

        o Fixed weird fork() problem which showed up as a heap
          deadlock.

        o Fixed broken _getdrive().

        o Made _chdrive() return -1 on error. It used to always
          return success earlier. (don't ask me why)

        o Fixed incorrect handling of -shared in GCC. It should
          be treated as -Zdll.

        o Various incorrect assertions in the strict/log build.
                
        o ...

    Known Limitiations/Problems:

        o Static linking not possible - might be fixed later.

        o Job control will only be applied to thread 1 in a process.
          This won't change.

        o Missing some process group interfaces required for
          job control. They'll show up soon I hope.

        o Not tested too well. Especially the regex update.
                
        Todos before LIBC06.DLL:
        
                0. Fix all bugs. :-)
                
                1. Implement new ino_t scheme and reimplement opendir
                   in BSD style while doing so (+fchdir).
                
                2. Shared IPC structures for XSI msq, sem and shm.
                
                3. Port string/w* functions.
                
                4. Missing job pgid functions.
                
                5. Port GLIBC intl/*. gettext is a pita! because it's
                   passing FILE pointers around between different LIBCs.
                   objdump is constantly broken between LIBC versions.



GCC v3.3.5 / LIBC v0.6 - Beta 1:
--------------------------------

    New features:

        o setitimer/alarm implementation. Needs some review later
          the accuracy isn't extacly great.

        o Added a couple of missing os2emx.h features.

        o Some more 16-bit thunkers.

    Bug fixes:

        o Select worker called wrong tcpip function.

        o Incorrect assertion during thread destruction.

        o Fixed broken chdir and getdrive.

        o Improved deadlock detection (fmutex have changed,
          thus stdio FILE is also changed).

        o ...


    Known Limitiations/Problems:

        o Static linking not possible - will be fixed.

        o Job control will only be applied to thread 1 in a process.
          This won't change.

        o Missing some process group interfaces required for
          job control. They'll show up soon.

        o Doesn't evaluate trailing slash in paths as directory
          specifier, it's currently ignored.



GCC v3.3.5 / LIBC v0.6 - Alpha 3:
---------------------------------

    This release have been timebombed and will stop working at the
    end of December 2004. The reason for this is that data structures
    shared between LIBC 0.6 and all future LIBC versions are not yet
    quite finalized. (For your comfort the timebomb will go away when
    the betas start, and this is the last planned LIBC v0.6 alpha.)


    New Features:

        o Updated GCC to version 3.3.5.

        o Replaced the signal implementation. The new implementation
          is much closer to the POSIX specs and implements a lot of
          new interfaces.

        o Experimental delayed loading import libraries. emximp have
          a new -l option for generating such libraries. At present
          emximp can only generate a.out libraries of this kind - so
          use emxomf to convert to OMF.

        o The dlfcn.h functions are in LIBC now.

        o New functions:
          getgrouplist(), initgroups(), memalign(), valloc(),
          mprotect(), _signal_os2(), _signal_sysv(),
          __sigpause_bsd(), bsd_signal(), killpg(), psignal(),
          sigaltstack(), sigblock(), sighold(), sigignore(),
          siginterrupt(), sigpause(), sigrelse(), sigsetmask(),
          sigtimedwait(), sigvec(), sigwait(), sigwaitinfo(),
          sigqueue(), sigset(), getgrgid(), getpwnam(),
          getpwuid(), setegid(), seteuid(), setregid(),
          setresgid(), setresuid(), setreuid(),
          setrgid(), setruid(), waitid(), wait3(),
          wait4() and getopt_long_only().


    Bug fixes;

        o Sockets were broken on some systems. Hopefully, this
          should be corrected now.

        o stat() failed on a file open for writing.

        o fork() didn't work for processes which allocated lot's
          of memory. Fixed incorrect syncing of memory objects.

        o ...


    Known Limitiations/Problems:

        o Static linking not possible - will be fixed.

        o alarm() is still missing. Code is 80% done but didn't
          make it for the release.

        o Job control will only be applied to thread 1 in a process.
          This won't change.

        o Missing some process group interfaces required for
          job control. They'll show up soon.



GCC v3.3.4 / LIBC v0.6 - Alpha 2:
---------------------------------

    This release have been timebombed and will stop work at the
    end of October 2004. The reason for this is that data structures
    shared between LIBC 0.6 and all future LIBC versions are not yet
    finalized.


    New Features:

        o Updated GCC to version 3.3.4.

        o 2nd fork() implementation.
          All binaries are by default forkable, use the link option
          -Zno-fork to disable this.
          The fork implementation rendered _rmutex useless and it
          has been removed.

        o Symlinks using EAs. This is work in progress. One of the
          limitiations is that readir will not report DT_LNK yet.

        o Unix compartment using chroot(). This offers a
          redirection of '/' to the chroot'ed root. The entrance
          to the compartment is the '/'. The exits are drive letters.
          The unix compartment is inherited by LIBC child processes.

        o getcwd() will now return the driveletter too (as VAC does)
          when not inside the unix compartement.
          _getcwdux() has been provided for porters which requires
          behaviour like the old getcwd() implementation.

        o Paths to unix files #defined in headers are now prefixed
          with "/@unixroot" which will be redirected to where the
          environment variable UNIXROOT points. After calling
          chroot() the target of "/@unixroot" will be changed too.

        o LIBC specific path rewriting (redirection). Built in is
          "/dev/null", "/dev/tty" and "/@unixroot".
          The environment variable LIBC_PATHREWRITERS is examined
          during init and DLLs specified in it are loaded and called.
          See src/emx/src/sys/pathrewrite.c for more details.

        o Non-unix like mode - link option -Zno-unix.
          This affects slashes and various other Unix-like features
          like for instance fork and symlinks.

        o Printf et al. have been extended to support some new format
          specifiers. (It's still lacking a bit to be SuS comforming.)

        o Sockets handles are now inherited by LIBC child processes.

        o LIBC specific filehandle flags are now inherited by LIBC
          child processes.

        o The GCCxyz.DLL is no longer needed when LIBC is used.
          However it is still shipped for special cases where LIBC
          isn't needed.

        o A good bunch of 'new' functions both from the SuS and from
          various Unix flavors, even one or two PC functions have been
          added. Accompanying these are new headers and header updates.
          Here are most of the new function names:
            __strverscmp(), _atfork_callback(), _getcwdux(),
            _getdcwd(), _nsdbtaddsrc(), _nsdbtput(), _nsdispatch(),
            _realrealpath(), canonicalize_file_name(), catclose(),
            catgets(), catopen(), chown(), chroot(), eaccess(),
            endgrent(), endnetgrent(), endusershell(), fchown(),
            fstatfs(), fstatvfs(), getdtablesize(), getfsstat(),
            getgrent(), getgrent_r(), getgrgid_r(), getgrnam_r(),
            getloadavg(), getmntinfo(), getnetgrent(),
            getpwent_r(), getpwnam_r(), getpwuid_r(), getrlimit(),
            getusershell(), innetgr(), lchown(), link(), mknod(),
            readlink(), setgrent(), setgroupent(), setgroups(),
            setnetgrent(), setpassent(), setrlimit(),
            setusershell(), sl_add(), sl_find(), sl_free(),
            sl_init(), statfs(), statvfs(), strmode(), strtok_r(),
            symlink() and sync().


    Bug fixes:

        o setlocale() have been rewritten. The code page is now
          taken from the locale rather than OS/2. Old behaviour
          is used if environment variable LIBC_SETLOCALE_OLDSTYLE
          is defined.

        o Buggy strspn() replaced by BSD implementation.

        o Thread backend have been reworked fixing certain
          problems when LIBC was loaded and initialized in threads
          other than the primary one. A LIBC specific TLS api
          was created during this effort.

        o Fixed a missing export from GCCxyz.dll which was causing
          incorrect behaviour of C++ exceptions in all previous
          releases.

        o Fixed a buffer overrun in iconv_open() which caused a
          corruption of the FS selector register, thus crashing
          the processing.

        o ...


    Known limitations and bugs:

        o mktime() works incorrectly for exterme values causing
          configure test to fail.

        o NSS probably doesn't work.

        o Trailing slashes of a path specification are not
          handled correctly after the rewrite of the path
          handling.

        o New path handling is not DBCS ready.

        o Socket handle duplication have not been implemented yet.

        o The __<syscall> function are in the process of being
          removed.

        o Not tested with mozilla.



v3.2.2 Beta 4 CSD 1:
--------------------

    Bug fixes:

        o Fixed crash in file stream allocation code.

        o Fixed incorrect time on machines which had DATETIME::timezone
          set. This fix changes the time granularity from hundredths of
          a second to milliseconds.

        o Added the SPBCDATA struct, the defines FCF_CLOSEBUTTON and
          BS_NOTEBOOKBUTTON and infosegment structs to os2emx.h

        o Fixed bug in sys/locale.h where it hid the lconv struct.

        o Fixed missing error number translations in getsockopt() and
          setsockopt().

        o Fixed potential conflict caused by sys/types.h not defining
          _KEY_T with the key_t typedef.

        o Fixed missing 64bit I/O support in ftell(), fstat() and stat().

        o Fixed UCS-2 codepage mappings.

        o Fixed problem with emxbind not recognizing option -e and
          a problem with case sensitivity in the export checking.


v3.2.2 Beta 4:
--------------

    (The changelog is removed, thus the release notes are more detailed.)

    New features and fixes:

        o Filehandle rewrite. Files, pipes and sockets now share the same
          handle space.

        o Updated binutils from v2.11.2 to v2.14 adding as-elf.exe and
          ld-elf.exe as goodies for the adventurous.

        o GCC defines __INNOTEK_LIBC__=0x005.
          The value reflects the LIBC version, form: 0xGMM
          Where G=major version and MM=middle version numbers.

        o Changed library search algorithms for the linkers (emxomfld
          and ld). Three variations, static, shared and shared+dll.
          (The options indicated corresponds to what binutils 2.12.x
          documents.)
          static: (-Bstatic, -non_shared, -dn, -static)
            1. libfoo_s.a
            2. foo_s.a
            3. libfoo.a
            4. foo.a
          shared: (default, -Bshared, -call_shared, -dy)
            1. libfoo_dll.a
            2. foo_dll.a
            3. libfoo.a
            4. foo.a
            5. libfoo_s.a
            6. foo_s.a
          shared+dll: (-Zdll-search with -Bshared, -call_shared, -dy)
            1. libfoo_dll.a
            2. foo_dll.a
            3. libfoo.a
            4. foo.a
            5. foo.dll
            6. libfoo_s.a
            7. foo_s.a

        o Added some deadlock checking/termination checks to semphores.

        o Added macros to os2emx.h for preserving FPU control word and
          applied these to certain read and write operations in LIBC.

        o Added feature to emxomfld to automatically convert a.out
          libraries and objects to OMF (using temporary files). Enabled
          by default but can be disabled by the option -Zno-autoconv.

        o Added support to emximp for dlls.

        o Added support for automatic conversion of dlls to temporary
          import libraries emxomfld and ld.

        o Added getopt_long() and changed getopt() to FreeBSD
          implementations.

        o Added a few more code page aliases.

        o Added optional breakpoint in abort. The presense of the env.var.
          LIBC_BREAKPOINT_ABORT triggers the breakpoint instruction.

        o Added syslog interfaces (contrib from Yuri Dario).

        o Added to libc and updated BSD db code to FreeBSD 5.1 level.

        o Added to libc and updated regex code to FreeBSD 5.1 level.

        o Ported the posix spawn api from GLIBC v2.3.2.

        o Updated with os2emx.h flags for DosQueryMemState().

        o Changed size_t to unsigned int (from unsigned long int) and
          ptrdiff_t to signed int (from signed long int) to comply with
          most of the other i386 environments.

        o Changed abort and default signal termination messages to say
          which process it's printed from.

        o Changed the glob() and globfree() implemenation with a port of
          the FreeBSD 5.1 implemenation.

        o Changed so_ioctl() to os2_ioctl() to better match the toolkit.

        o Changed time_t to be signed as in BSD & linux.
          (Negative values means date/time before epoc.)

        o Changed to FreeBSD implementation of difftime().

        o Increased default stream buffer size to 2 pages.

        o Workaround for DosSetFileLocksL() on non JFS volumes.

        o Workaround for bad FIL_STANDARDL buffer handling in os2krnl.

        o Fixed waitpid() to respect the WNOHANG flag.

        o Fixed strerror() to set errno if an invalid error number is
          specified.

        o Fixed problem with emxexp emitting ordinal without being told.

        o Fixed broken setenv().

        o Fixed errno value for read() and write() when the handle isn't
          opened for that operation.

        o Fixed a bad record length problem in emxomf.

        o Fixed type_tag too long issue in emxomf.

        o Fixed repetition of main source file in HLL debuginfo (emxomf).

        o Fixed weakld problem with selfrefering aliases.

        o Fixed weakld problem with PUBLIC and COMM clash.

        o Fixed problem with streams not being flushed on termination.

        o Fixed define clash in float.h when in C99 mode.

        o Fixed abend in GCC if TMPDIR or TMP was ending with a slash.

        o Fixed crash in ld when having fixups to weak symbols.

        o Fixed bad conversion of dll0*.o to OMF, the OMF version got an
          unwanted stack object.

        o New functions:
            isblank(), ishexnumber(), isnumber(), mempcpy(), realpath(),
            strnlen(), asctime_r(), ctime_r(), gmtime_r(), localtime_r(),
            strerror_r(), usleep().

        o New functions & globals (from FreeBSD 5.1):
            imaxabs(), imaxdiv(), strtoimax(), strtoumax(), hcreate(),
            hdestroy(), hsearch(), insque(), lfind(), lsearch(),
            remque(), tdelete(), tfind(), tsearch(), twalk(), reallocf(),
            strsignal(), sys_signame, sys_siglist, sys_nsig, regcomp(),
            regerror(), regexec(), regfree(), + bsd db functions.

        o New functions (from GLIBC 2.3.2):
            error(), error_at_line(), strndup(), argz_add(),
            argz_add_sep(), argz_append(), argz_count(), argz_create(),
            argz_create_sep(), argz_delete(), argz_extract(),
            argz_insert(), argz_next(), argz_replace(), argz_stringify(),
            posix_spawnp() posix_spawn(), posix_spawnattr_destroy(),
            posix_spawnattr_getflags(), posix_spawnattr_getpgroup(),
            posix_spawnattr_getschedparam(),
            posix_spawnattr_getschedpolicy(),
            posix_spawnattr_getsigdefault(),
            posix_spawnattr_getsigmask(), posix_spawnattr_init(),
            posix_spawnattr_setflags(), posix_spawnattr_setpgroup(),
            posix_spawnattr_setschedparam(),
            posix_spawnattr_setschedpolicy(),
            posix_spawnattr_setsigdefault(),
            posix_spawnattr_setsigmask(),
            posix_spawn_file_actions_addclose(),
            posix_spawn_file_actions_adddup2(),
            posix_spawn_file_actions_addopen(),
            posix_spawn_file_actions_destroy(),
            posix_spawn_file_actions_init()

        o New headers:
            nerrno.h (toolkit compatability).

        o New headers (from FreeBSD 5.1):
            search.h, sys/queue.h, net/if_types.h.

        o New headers (from GLIBC 2.3.2):
            features.h (somewhat crippled),
            sys/gnu/cdefs.h (included from BSD styled sys/cdefs.h).

        o Updated headers:
            stddef.h (FreeBSD, sys/stddef.h (FreeBSD),
            ulsitem.h (missing defines), os2emx.h, ...

        o What I forgot...


v3.2.2 Beta 3 Fix 1 (private build):
------------------------------------

    Fixes to LIBC:

        o Crash if calloc was called before main().

        o TZ parsing of timezones such as PST8EDT.

        o sigsetjmp() and siglongjmp() visibility.


v3.2.2 Beta 3:
--------------

    A few new features and fixes.

        o Fixed a bunch of debug info problems.

        o Added large file support.

        o Enabled high memory support for LIBC. Two new options to GCC:
          -Zhigh-mem and -Zhigh-low. If the program is to be enabled for
          high memory use, specify -Zhigh-mem when linking.

          Note that socket is not high memory enabled yet.

        o Made LIBC preserve the FS selector.

        o Added random() and *rand48() from BSD.

        o Fixed crash with link386 and unresolved symbols.


v3.2.2 Beta 2:
--------------

    A few bugfixes and a some new features (as usual).

        o Added file locking support to LIBC.

        o Fixed _System and _Optlink bugs and made _Optlink support
          floating point argument passing in registers.

        o Header updates related to limits and file locking primarily.

        o Timezone fixes.

        o Fixed some CRT init trouble in regards to getenv and putenv.

        o And some other minor stuff..


v3.2.2 Beta 1:
--------------

    A few bugfixes and a some new features.

        o Locale support in libc.

        o Implemented a different approach to OMF and weak symbols. This
          new hack performs pre-linking before invoking the OMF linker
          generating new .def files if needed and an extra object file with
          aliases to resolve the weak symbols correctly.
          The old approach will be used used when GCC_WEAKSYMS is present in
          the environment.

          Please note that due to a bug in BFD, weak symbols don't work
          100% correctly. This will be addressed as soon as we have
          performed the switch to a more recent version of binutils.

        o A couple of new functions in libc, and a few corrections to
          existing in respect to namespaces.

        o Addressed issues with calling conventions. We now detect
          incompatible calling conventions, emitting warnings and errors
          where appropriate.

        o _Optlink is much better, but there are still some issues
          left. Passing prototyped floating point parameters to
          _Optlink doesn't work. Mixing of parameters which go into
          registers (eax, edx, ecx) and parameters which
          don't - void foo(int eax, struct sss s, int edx) - doesn't
          work. All these issues are being addressed and are expected
          to be fixed in the next build.

        o Changed GCC to link with shared libc by default. This means
          that in order to link with the static libc one has to specify
          -static. It also means that -Zmtd or -Zcrtdll are no longer
          required for linking with shared libc and can be removed from
          all makescripts.

        o Changed EMXOMFLD defaults to ilink from Visual Age for C++
          v3.6.5 or later (preferably later). The emxomfld usage output
          will instruct you on how to use older linkers. For VAC308 and
          VAC365 linkers /dbgpack is specified if debuginfo is to be
          generated. Emxomf checks for EMXOMFLD_TYPE=link386 when choosing
          debug info level.

        o Shipping three extra libc dlls:
            libc02.dbg:     Unstripped version of libc02.dll. This is
                            identical except from the presense of debug
                            info.
            libc02.prf:     Linked together from profiled enabled
                            libraries using kProfiler.
            libc02.elh:     Standard libc but linked with an external
                            electrical fence heap from kLibDbg.
          These libc02.* dlls can be used instead of libc02.dll. kLibDbg
          and kProfiler is available in separate zip files at same
          location as the rest of the InnoTek GCC suite. However these
          external tools are provided as is. (I might actually not find
          time to put them out yet.)

        o Distribution is splitted into several zips:
            -core.zip:  All you really need.
            -dbg.zip:   Map files, unstripped tools and libs, and
                        libc02.elh.
            -prf.zip:   Profiling libraries and libc02.prf.
            libc.zip:   The runtime libraries. (included in core.)
          The big zip is everything.

v3.2.2 Alpha 3:
---------------

    Primarily bugfixes.

        o Changed code generator for floating point truncations (double
          to int casts and such) so PM can freely mess up the fpu status.

        o We were using the wrong float.h in two sense. We're now using
          the correct one which includes all the PC defines and
           prototypes.

        o Fixed a few issues with error defines and tcpip.
          Note that some of the error defines have changed value in the
          process so we could become compatible with the tcpip stack
          and FreeBSD.

        o Corrected bugs in a number of headers.

        o Added more OS/2 prototypes and imports. There is still work
          left on the header part,

        o Optimized emxomf debug info conversion.

        o Wrapped bsdselect for BSD 4.4 header mode to implement
          bsdselect().

        o .... what did we forget...


v3.2.2 Alpha 2:
---------------

    A few bugfixes and a couple of new features.

        o The TCP/IP headers and libraries scheme have been changed.
          The default is the current OS/2 tcpip toolkit (BSD 4.4 based).
          To target the older OS/2 tcpip stack (BSD 4.3 based) you must
          define TCPV40HDRS before including any TCP/IP headers and make
          sure usr/lib/tcpipv4 is searched before usr/lib (this is to
          get the right libsocket). It is recommended to use the -D
          compiler option for the define and either the LIBRARY_PATH or
          the -L compiler/linker option for the library.

        o There are a couple of new and updated based on FreeBSD 5.1.
          sys\stdint.h and inttypes.h (and a few internal once) are new.
          sys\types.h and unistd.h are the ones most heavily updated.
          We're working on getting the headers and libc in a better
          shape standardwise to easy compatability and portability.

        o A infinite loop in emxomf has been fixed.

        o Linker error on sopen() has been corrected.

        o .... what did we forget...


v3.2.2 Alpha 1:
---------------

    This is the first release from InnoTek, and it contains the InnoTek LIBC.
    In addition to the new LIBC there is a number of other major changes:

        o Name mangling in OMF mode have changed.
          Until this release emxomf used to pretty much strip one leading '_'
          from symbols when converting them to omf. This is now longer done
          chiefly in order to correctly support mangling calling conventions
          like __stdcall and __cdecl. This change have the following side
          effects:
            - _System and __cdecl no longer produces the same names and hence
              all OS/2 API which are _System must be declared as _System in
              order to link.
            - Assembly code might need an extra underscore to work, or
              perhaps change the prototypes to _System.
            - Global variables are prepended and underscore, so mixing VAC and
              GCC, or accessing globals from asm, take care.
              (MSC v6.0 does this too, so it's not any uncommon practise.)

          The OS/2 headers which are included are all updated to use _System.

        o TCPIP headers are updated a quite a bit to match the toolkit ones
          and to reflect the fact that the new libc does not a having common
          handle space for files and sockets. These changes aren't 100%
          completed yet, and usage probably will uncover some issues left in
          there. Also for the programmer there is the following changes in
          the apis provided:
            - TCPV40HDRS are supported and should work like with the toolkit
              headers. It will alias all functions to tcpip40_ editions
              (using #defines) so we get the right imports thru -llibsocket.
            - There is no support for sockets in select(). To do select on
              sockets you will have to use bsdselect() or os2_select().
              bsdselect() is only available for TCPV40HDRS. For
              !defined(TCPV40HDRS) fd_set is in the emx/bsd format and not the
              OS/2 tcpip v5.0 format.
            - Socket IOCTLs are not supported by the ioctl() libc function
              because of the separate handle space for sockets. For sockets
              so_ioctl() and os2_ioctl() are used. os2_ioctl() is not available
              when TCPV40HDRS is defined. According to the tcpref in v5.0
              so_ioctl() only supports BSD ioctls.
            - writev() and readv() also clashes with libc. For socket handles
              use so_writev() and so_readv().

        o The prefered OMF linker is now ilink. link386 will fail with an odd
          error message if you tell gcc/g++ to make debug info. Set the
          EMXOMFLD_LINKER environment variable to value ilink in order to use
          ilink as OMF linker.
          It likely that we will change the default OMF linker to ilink in an
          later version of the GCC suite.

        o .... what did we forget...