pragma directive causes build error: Symbol redefined

Amir El-Hussein

Other Parts Discussed in Thread: MSP430FR5959

Hi out there...

I'm trying to move an array of structs to FRAM using the #pragma PERSISTENT (xyz) directive inside an header file and not in Main.c

At compile time the compiler claims about Error: symbol "xyz" redefined: first defined in "./xxx.obj"; redefined in "./main.obj"

If i define this symbol in Main.c compilation works, but the symbol logically is not available to other moduls.

Does anybody know, how to get rid of this?

THX Amir

CCS Version: 6.1.3.00034

MSP430FR5959

over 9 years ago

0 Amir El-Hussein over 9 years ago

Prodigy 140 points

Update: The Symbol error is caused by predefining the struct in header file:

typedef struct ptv {
unsigned short cnt;
long val[4];
long avg;
} ptv;

ptv TES[200] = {0};

If i skip just note: ptv TES[200]; i get an compiler warning telling the variable should be initialized, and the array stays in RAM instead of FRAM...

??

0 Michael P over 9 years ago in reply to Amir El-Hussein

Expert 1810 points

If your header file includes the line "ptv TES[200] = {0};", then each "translation unit" (roughly, each *.c file) that #include's the header file will define the variable, and the linker will issue the error you see.

You can declare the variable in a shared header file by writing "extern ptv TES[200];", and then you should define and initialize it in exactly one *.c file, using the "ptv TES[200] = {0};" line you have now.