PRB: Error L2028: Automatic Data Segment Plus Heap Exceed 64K (43177)
The information in this article applies to:
- Microsoft Windows Software Development Kit (SDK) 3.0
- Microsoft Windows Software Development Kit (SDK) 3.1
This article was previously published under Q43177 SYMPTOMS
The following error is received during linking:
L2028: Automatic data segment plus heap exceeds 64K
CAUSE
The LINK error L2028 is caused when the data segment required by the
application exceeds 64K. This can be calculated by adding the HEAPSIZE
and STACKSIZE portions of the .DEF file, plus the global data and
static data. These two numbers of the .DEF file plus the size of the
global and static data need to be under 65536 bytes. The global data
refers to global variables in an application, not the global heap.
RESOLUTION
The solution is to reduce the amount of the HEAPSIZE, STACKSIZE,
global data, or static data. If the application utilizes large amounts
of global data, some of this data should be moved into the memory
covered by Windows [e.g. utilizing GlobalAlloc()]. If the data
consists of constants, such as string tables, these can be moved into
Windows resources using the RC compiler.
This problem may also be resolved by using the /Gt compile option which is
available beginning with the Microsoft C/C++ 7.0 compiler. Using the /Gt
switch, you can specify the size a static object and allocate the static
object its own data segment. If need be the threshold value can be adjusted
to ensure some of the data objects are allocated in an additional data
segment, outside of the default data segment. The default threshold value
when the /Gt option is not specified will be 32767 bytes.
| Modification Type: | Major | Last Reviewed: | 3/16/2004 |
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| Keywords: | kb16bitonly KB43177 |
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