Compiler Error During build when i used file concept (fopen and fprintf) to write into file

[shekharsulgiti]

Hi All,

Need one help.
When I try write to file using fopen / fwrite functions in debug mode I receive like
Error: L6200E: Symbol __stdout multiply defined (by stdio_streams.o and my_lib.a)

not enough information to list the image map
while building the code. and how I can solve it. 

[Andrew Neil]

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@shekharsulgiti wrote:

Error: L6200E: Symbol __stdout multiply defined (by stdio_streams.o and my_lib.a)

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You're using Keil, aren't you?

"multiply defined" is their clumsy way of saying that you have multiple definitions of __stdout

As this is specific to Keil - not really to do with STM32 - you'd be better asking them:

https://community.arm.com/support-forums/f/keil-forum

(BTW: it's not a Compiler error - it's a Linker error)

EDIT:

The message tells you where  the multiple definitions are:

1. in stdio_streams.o;
2. in my_lib.a

So you need to decide which one of them is the one you want, and get rid of the other one.

Presumably, a library with a name like "my_lib" is something you wrote yourself? If so, consider whether it should be defining __stdout ... ?

[nouirakh]

Hello @shekharsulgiti 

If you need both libraries and they must contain the definition of __stdout, you may need to modify the linker script to resolve the symbol conflict. This can be complex and depends on your specific toolchain and build system.

[Tesla DeLorean]

There's not file system here, are you attempting semi-hosting, or what exactly?

[Andrew Neil]

Is this how Keil does UART output from printf?