Q60648: C 6.00 STARTUP.DOC: Placing the Stack Outside of DGROUP

Article: Q60648
Product(s): See article
Version(s): 6.00   | 6.00
Operating System(s): MS-DOS | OS/2
Keyword(s): ENDUSER | readme readme.doc start-up | mspl13_c
Last Modified: 19-APR-1990

The following information is taken from the C Version 6.00 STARTUP.DOC
file.

Placing the Stack Outside of DGROUP
-----------------------------------

If your program requires a large amount of stack space, the run-time
library can be configured to place the stack in a separate segment
outside of DGROUP. By doing this, the stack can be up to 64K in size
without reducing the amount of storage available in DGROUP for near
data. In order to do this your program must be either compact, large,
or huge model. You must also direct the compiler to assume that that
SS != DS. Thus, your memory model specification should be -ACw, -ALw,
or -AHw. See the compiler documentation for more information about
these options.

To use a far stack, you must assemble the startup sources provided
with C 6.0. In the startup sources directory is a file called
"makefile" which controls the startup module build process for the run
time library. To enable a far stack, you need to edit the makefile.
Near the top of the file are two lines which begin "CFLAGS=" and
"ASMFLAGS=". You should add the text " -DFARSTACK" to the end of these
two lines. Then build the startup modules according to instructions
given previously in this file. You should then use the LIB utility to
replace the startup modules in your library with the new modules you
have built. When linking, the size of the stack can be controlled with
the /STACK command line option.

If you are creating DOS programs, the size of your .EXE file will be
increased by the size of your stack. This is a consequence of the DOS
.EXE format. To reduce the size of your .EXE file, link with the
/EXEPACK option.

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