Q65329: QC 2.0x Incorrectly Stores Uninitialized Global Data in DGROUP

Article: Q65329
Product(s): See article
Version(s): 2.00 2.01
Operating System(s): MS-DOS
Keyword(s): ENDUSER | buglist2.00 fixlist2.50 | mspl13_c
Last Modified: 31-AUG-1990

Microsoft QuickC version 2.00 and Microsoft QuickAssembler version
2.01 both store uninitialized global data in the default data segment
for the program (DGROUP). This is an error for compact and large model
programs according to standard Microsoft segment-ordering conventions.
In versions 2.50 and 2.51, this was corrected and uninitialized global
data is now stored in FAR_BSS for compact and large models.

Sample Code
-----------

int global;

void main()
{}

To see this concept demonstrated, compile the above program under
QuickC versions 2.0x and 2.5x. If the .MAP file from each is examined,
the results will be obvious.

Microsoft has confirmed this to be a problem with QuickC version 2.00.
This problem was corrected with QuickC versions 2.50 and 2.51.

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