• Kenneth Spencer <kas kaspencer.com> May 11 2007
• Walter Bright <newshound1 digitalmars.com> Jul 11 2007

Re.: Compiling C programs from previous Zortech/Symantec compilers

We have several programs written in previous versions of
Zortech/Symantec C (no C++), which we wish to convert to compile
with Digital Mars. (Zortech C/C++ and Symantec C/C++ are
predecessors of Digital Mars).

Most of the programs consist of several C modules compiled and
linked with a Large Memory module: we have used this approach
because the resultant executables have been found to run on all
versions of Windows from 3.1 through 9/98/2k/2k3/XP and now Vista.

We are trying to use the IIDE for these projects, which have
previously been compiled and linked at the command line. However,
when we try to compile the programs in DM, we encounter rather too
many errors and issues, and wondered whether anyone may be able to
help.

ISSUE 1
we do not seem to be able to change the Memory Model for
compilation: it is restricted to "Flat".

ISSUE 2
Issue two occurs early in the compilation of the first module and
results in the compiler ceasing to process code after the include
statement:
#include    <drivinit.h>

However the compiler continues to count lines (even thought the
count grossly exceeds the line count of our projects!) until it
fails and issues the report:
============ complier output report ===========================
sc Persw.c -p -mn -o+time -WA -3 -a8 -c -H -HO- -
IC:\SW_Tools\DigiMars\include -oPersw.obj
nbytes = 65520, ph_maxsize = 65520
Fatal Error: C:\SW_Tools\DigiMars\include\win32\drivinit.h(2):
internal error ph 1817
Lines Processed: 645805  Errors: 1  Warnings: 0
Build failed
================================================================

ISSUE 3
If we remove the Include line which generates ISSUE 1, the
compiler stops and reports many problems relating to a need to
introduce explicit casts into our code. This is code that compiles
and runs correctly under the previous versions.
Some examples of the code, and the errors generated are:
============= CODE SAMPLE A =====================================
BOOL InitApplication (hInstance)
HANDLE hInstance;

{
int count;
WNDCLASS wc;

wc.style         = NULL;
wc.lpfnWndProc   = MainWndProc;
wc.cbClsExtra    = 0;
wc.cbWndExtra    = 0;
wc.hInstance     = hInstance;
wc.hIcon         = LoadIcon       (hInst, "PERSWIcon");
wc.hCursor       = LoadCursor     (NULL, IDC_ARROW);
wc.hbrBackground = GetStockObject (LTGRAY_BRUSH);
wc.lpszMenuName  = "PERSWMenu";
wc.lpszClassName = "PERSWClass";

return (RegisterClass (&wc));
}
==================== COMPILER OUTPUT =========================
sc Persw.c -p -mn -o+time -WA -3 -a8 -c -H -HO- -
IC:\SW_Tools\DigiMars\include -oPersw.obj
Error: K:\PERS-SYS\DigiMarsTest\Persw.c(850): need explicit cast
to convert
K:\PERS-SYS\DigiMarsTest\Persw.c(850): from: void *
K:\PERS-SYS\DigiMarsTest\Persw.c(850): to  : unsigned
==============================================================
This error references the line:
wc.style         = NULL;
in the above code.

There are many errors of this type, for example:
================ CODE SAMPLE B ===============================
Referencing the line below from CODE SAMPLE A above:
wc.lpfnWndProc   = MainWndProc;
we have defined the function MainWindowProc as:
long FAR PASCAL  MainWndProc     (HWND, unsigned, WORD, LONG);
in our include file for the Project.
This generates the error:
Error: K:\PERS-SYS\DigiMarsTest\Persw.c(851): need explicit cast
to convert
K:\PERS-SYS\DigiMarsTest\Persw.c(851): from: long (*std func)(void
*,unsigned ,unsigned short ,long )
K:\PERS-SYS\DigiMarsTest\Persw.c(851): to  : long (*std func)(void
*,unsigned ,unsigned ,long )

So can anyone advise us on any of these issues, or do we have to
go back to our old compiler and forget about tryoing to use the
later versions of Digital Mars ?

Regards and thanks in advance,

Kenneth Spencer

Kenneth Spencer wrote:
 Re.: Compiling C programs from previous Zortech/Symantec compilers
 
 We have several programs written in previous versions of
 Zortech/Symantec C (no C++), which we wish to convert to compile
 with Digital Mars. (Zortech C/C++ and Symantec C/C++ are
 predecessors of Digital Mars).
 
 Most of the programs consist of several C modules compiled and
 linked with a Large Memory module: we have used this approach
 because the resultant executables have been found to run on all
 versions of Windows from 3.1 through 9/98/2k/2k3/XP and now Vista.
 
 We are trying to use the IIDE for these projects, which have
 previously been compiled and linked at the command line. However,
 when we try to compile the programs in DM, we encounter rather too
 many errors and issues, and wondered whether anyone may be able to
 help.
 
 ISSUE 1
 we do not seem to be able to change the Memory Model for
 compilation: it is restricted to "Flat".


There is only one memory model for Win32 programming, and that's 'flat'. 
For 16 bit Windows, use the other IDDE scw.exe, not scw32.exe.

 
 ISSUE 2
 Issue two occurs early in the compilation of the first module and
 results in the compiler ceasing to process code after the include
 statement:
 #include    <drivinit.h>
 
 However the compiler continues to count lines (even thought the
 count grossly exceeds the line count of our projects!) until it
 fails and issues the report:
 ============ complier output report ===========================
 sc Persw.c -p -mn -o+time -WA -3 -a8 -c -H -HO- -
 IC:\SW_Tools\DigiMars\include -oPersw.obj
 nbytes = 65520, ph_maxsize = 65520
 Fatal Error: C:\SW_Tools\DigiMars\include\win32\drivinit.h(2):
 internal error ph 1817
 Lines Processed: 645805  Errors: 1  Warnings: 0
 Build failed
 ================================================================


I can't figure this out without a reproducible sample.

 
 ISSUE 3
 If we remove the Include line which generates ISSUE 1, the
 compiler stops and reports many problems relating to a need to
 introduce explicit casts into our code. This is code that compiles
 and runs correctly under the previous versions.
 Some examples of the code, and the errors generated are:
 ============= CODE SAMPLE A =====================================
 BOOL InitApplication (hInstance)
 HANDLE hInstance;
 
 {
 int count;
 WNDCLASS wc;
 
 wc.style         = NULL;
 wc.lpfnWndProc   = MainWndProc;
 wc.cbClsExtra    = 0;
 wc.cbWndExtra    = 0;
 wc.hInstance     = hInstance;
 wc.hIcon         = LoadIcon       (hInst, "PERSWIcon");
 wc.hCursor       = LoadCursor     (NULL, IDC_ARROW);
 wc.hbrBackground = GetStockObject (LTGRAY_BRUSH);
 wc.lpszMenuName  = "PERSWMenu";
 wc.lpszClassName = "PERSWClass";
 
 return (RegisterClass (&wc));
 }
 ==================== COMPILER OUTPUT =========================
 sc Persw.c -p -mn -o+time -WA -3 -a8 -c -H -HO- -
 IC:\SW_Tools\DigiMars\include -oPersw.obj
 Error: K:\PERS-SYS\DigiMarsTest\Persw.c(850): need explicit cast
 to convert
 K:\PERS-SYS\DigiMarsTest\Persw.c(850): from: void *
 K:\PERS-SYS\DigiMarsTest\Persw.c(850): to  : unsigned


Implicit casting of void* to unsigned is not valid C code, so an 
explicit cast is needed.

 ==============================================================
 This error references the line:
 wc.style         = NULL;
 in the above code.
 
 There are many errors of this type, for example:
 ================ CODE SAMPLE B ===============================
 Referencing the line below from CODE SAMPLE A above:
 wc.lpfnWndProc   = MainWndProc;
 we have defined the function MainWindowProc as:
 long FAR PASCAL  MainWndProc     (HWND, unsigned, WORD, LONG);
 in our include file for the Project.
 This generates the error:
 Error: K:\PERS-SYS\DigiMarsTest\Persw.c(851): need explicit cast
 to convert
 K:\PERS-SYS\DigiMarsTest\Persw.c(851): from: long (*std func)(void
 *,unsigned ,unsigned short ,long )
 K:\PERS-SYS\DigiMarsTest\Persw.c(851): to  : long (*std func)(void
 *,unsigned ,unsigned ,long )


The functions have different parameter types, so issuing an error is 
correct. I suggest determining which function declaration is the correct 
one, and change the other to match.

 
 So can anyone advise us on any of these issues, or do we have to
 go back to our old compiler and forget about tryoing to use the
 later versions of Digital Mars ?


If the older compilers are working fine for you, and you do not wish to 
change any of the legacy source code, there is no reason to upgrade. But 
if you're writing any new code, I'd use the newer compiler as it is more 
standard compliant.

 
 Regards and thanks in advance,
 
 Kenneth Spencer