I'm running sdcc V2.9.2 on Windows XP from build
sdcc-20090817-5492-setup.exe.
When I define a bit variable in a function, compile functions separately,
then link together I get a linker warning that the global variable
referenced by the module is undefined.
?ASlink-Warning-Undefined Global '_FOO_VARIABLENAME_1_1' referenced by
module 'FOO'
I have a main application. mainApp.c, along with a subordinate
application myFoo.c compiled in DOS using;
sdcc -mmcs51 --model-small --iram-size 256 -I C:\SDCC\Include -c mainApp.c
sdcc -mmcs51 --model-small --iram-size 256 -I C:\SDCC\Include -c myFoo.c
then link using:
sdcc -mmcs51 --model-small --iram-size 256 ^
--code-loc 0x0500 --stack-loc 0x0080 --xram-loc 0x3000 ^
-L C:\SDCC\MyCode\EZ-USB_Lib -l EZUSB -I C:\SDCC\Include ^
mainApp.rel myFoo.rel
myFoo.rel will contain a function such as:
bit myFunction( void)
{
bit myFlag;
myFlag = TRUE;
return(myFlag);
}
unfortunately the above code worked and didn't exhibit the same issue. The
main failed though.
// Function prototype.
bit myFunction( void);
void main(void)
{
bit myFlag;
unsigned char tempByte;
myFlag = myFunction();
}
gives me a linker error ?ASlink-Warning-Undefined Global
'_main_myFlag_1_1' referenced by module 'fw' Here my main is in fw.c.
I suppose I could stop using bit variables as flags in functions. Or make
them all globals. But the sdccman appears to support local bit functions
too.
I also question if its a bseg size issue? I'm using the Cypress CY7C68013
with 16 8-bit bit addressable registers. Will the linker support that or
think that I've only got 16 bits available? That might explain why some
of the time it may work depending upon when it assigns the bit address.
Any help is appreciated.
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