C166: Putting Initialized Variables in XDATA

Information in this article applies to:

• C166 Version 3.12 and later

SYMPTOMS

I have a very large program with many large, initialized variables. When I build my project, I receive one of the following error messages:

*** ERROR 172 IN LINE 9 OF test.c: 'HDATA0': length exceeded: act=172032, max=65536

Error 106: Section Overflow
Section: ?C_INITSEC

CAUSE

This error occurs because the section used to initialize global variables is overflowing. The following example program demonstrates this error.

int big_array1 [0x7000] = { 1, 2, 3, 4, };
int big_array2 [0x7000] = { 1, 2, 3, 4, };
int big_array3 [0x7000] = { 1, 2, 3, 4, };

void main (void)
{
}

RESOLUTION

The best solution is to place some of your variables in XDATA by using the XHUGE memory type when you declare the variable. For example:

int xhuge big_array1 [0x7000] = { 1, 2, 3, 4, };
int xhuge big_array2 [0x7000] = { 1, 2, 3, 4, };
int xhuge big_array3 [0x7000] = { 1, 2, 3, 4, };

void main (void)
{
}

MORE INFORMATION

• Refer to xhuge in the C166 User's Guide.

SEE ALSO

• C166: Purpose of 'volatile' and 'const' Keywords

Last Reviewed: Thursday, February 25, 2021