Dear SCO Customer,

Support Level Supplement (SLS) PTF7123A, the UnixWare/OpenServer 
Development Kit Supplement, corrects known problems with running 
the UnixWare/OpenServer Development Kit (UDK) 7.0.0 on SCO operating 
systems.

SLS PTF7123A contains modified versions of these files on 
UnixWare 7 systems:

        /usr/ccs/lib/acomp
        /usr/ccs/lib/c++be
        /usr/ccs/lib/c++fe
        /usr/ccs/lib/fe.so
        /usr/ccs/lib/optim

SLS PTF7123A contains modified versions of these files on
SCO UnixWare 2.1.x and SCO OpenServer Release 5 systems:

        /udk/usr/ccs/lib/acomp
        /udk/usr/ccs/lib/c++be
        /udk/usr/ccs/lib/c++fe
        /udk/usr/ccs/lib/fe.so
        /udk/usr/ccs/lib/optim


Problem Specifics:
------------------

1. Optimizer may use one register for 2 arguments when "unsafe" ASM
   functions are called, causing bad code to be generated.
   NOTE: This problem does not exist in UnixWare 7.0.1. 
   Tracking numbers: ul98-03604, 500626

2. A "for" loop with a known range at compile time (constant initial
   and final values) that contains a sparsely populated "switch"
   statement with the majority of the "case" blocks ending with a
   "return" may be incorrectly optimized.  Symptoms may appear as
   early termination of the loop, corruption of a local variable, or
   incorrect indexing into an array.
   NOTE: This problem does not exist in UnixWare 7.0.1. 
   Tracking numbers: ul98-03902, 500631

3. Incorrect optimization of a "for" loop containing a NULL pointer 
   check may result in the NULL pointer check getting moved outside
   the loop, but with subsequent dereference of that NULL pointer 
   remaining inside the loop, causing an application to dump core.
   NOTE: This problem does not exist in UnixWare 7.0.1. 
   Tracking numbers: ul98-04007, 500627

4. Yacc(1) generated source code contains #line preprocessor directives
   with the file name of the yacc source file.  If the first occurrence
   of such a #line directive is within a function, it is possible that
   the file name will be corrupted and possibly result in the corruption 
   of the compiler stack, causing the compiler to core dump.
   Tracking numbers: ul98-27207, 710645

5. Degenerate unsigned comparisons with zero in a "?:" construct can 
   cause the compiler to core dump in some situations.
   Tracking numbers: ul98-30722, 500891

6. Intermittent C++ compiler core dumps when compiling the SGI STL.
   Tracking numbers: ul98-29212, 500874

7. Using the "-Zp1" flag to the C++ compiler with bit fields may create
   a structure layout with a bit field that straddles the base type
   container boundary.  This may result in incorrect code to access
   or modify that bit field.  A symptom of this problem is an assembler
   error stating that a "literal value does not fit" in the assembly
   instruction coding.
   Tracking numbers: ul98-23911, 500819


The release notes displayed prior to installation can be found in

     /var/sadm/pkg/ptf7123/install/ptf7123.txt

Software Notes and Recommendations
----------------------------------

SLS PTF7123A should only be installed on these SCO products running the 
UnixWare/OpenServer Development Kit 7.0.0:

     UnixWare 7.0.0 with the UnixWare 7 Release Supplement (uw7rs)
     UnixWare 7.0.1 
     SCO UnixWare Application Server Release 2.1.2, 2.1.3
     SCO UnixWare Personal Edition Release 2.1.2, 2.1.3
     SCO OpenServer Enterprise System Release 5.0.4, 5.0.5
     SCO OpenServer Host System Release 5.0.4, 5.0.5
     SCO OpenServer Desktop System Release 5.0.4, 5.0.5


Testing of the modified software contained in this SLS has been
conducted only to the extent necessary to confirm that it resolves
the problems stated above.  Such testing consists of re-creating
the problem conditions (typically in an SCO test laboratory) and
verifying that the problems no longer occur.  No other testing of
this software has been done.


Installation Instructions
-------------------------

1. Download the ptf7123a.Z file to the /tmp directory on your machine.

2. As root, uncompress the file and add the SLS package to your system
   using these commands:

        $ su
        Password: <type your root password>
        # uncompress /tmp/ptf7123a.Z
        # pkgadd -d /tmp/ptf7123a
        # rm /tmp/ptf7123a

3. There is no need to reboot the system after installing this SLS.


Removal Instructions
--------------------

1. As root, remove the SLS package using these commands:

        $ su
        Password: <type your root password>
        # pkgrm ptf7123

2. There is no need to reboot the system after removing this SLS.


If you have questions regarding this SLS, or the product on which 
it is installed, please contact your software supplier.

We appreciate your business.

SCO Support Services