undefined reference to '__ctype_b'

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originally posted by shachris23@Jan 14 2006, 03:37 AM

it does work when i link to a dummy application. however, is there a way to increase the size though for global pointer though? because we tried compiling and linking the same project under fedora core 4 with the gcc version 3.4.1, and it linked in just fine.

thus, we suspect this is a nios-ii-specific problem?

what does everybody think?

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Yes, because the Nios compiler uses a register to speedup data access. In general you cannot increase the amount of GP-relative memory, but there are two ways:

You can either

- compile using the -G0 option

or,

- put your small data (global ints, global chars, ...) inside a struct, or allocate them in another section...

you can try something like

int foo __attribute__ ((section (".data"))) = 57;
int bar __attribute__ ((section (".bss"))); // initialized to 0

the section attribute must stay both in the declaration and on the definition of the variables.

There is also a section about that in the ERIKA Enterprise manual, section 4.8.4, available for free at the evidence literature page (http://www.evidence.eu.com/nios2/literature.asp)

bye

Paolo