Third Party library

[Hardik02]

Hello, 

I am trying to compare a third party libraries size on my STM32 project. 

Methodology 

• Firstly, i build a project without including a third party library and build it. 
• Secondly i build a project after including a third party library and compare memory usage with build analyzer and surprisingly i get the same result.

How i can know the exact memory size used by library? 

i used below libraries.

 

No.
1	Micro CBOR	JavaScript
2	NanoCBOR	C
3	QCBOR	C
4	TinyCBOR	C
5	libCBOR	C

 

Without Library build project.

 

 

[mƎALLEm]

You have to check the map file (.map in \STM32CubeIDE\Debug): so are you really calling the library APIs?

Example:

Also when you say you add a library, you mean a pre-build library or in source files? Because in the first case you need to add the library and its path here:

 

[Hardik02]

I just include the library at main.C file. i didn't use any function of the library. 

[mƎALLEm]

If you just included the .h file without any call from the library, as you you didn't add anything. So you must call something from the library.

[Andrew Neil]

If parts of a library are not used, it's possible (likely?) that the unused code is not added to the final image - so you'd need a test case which actually used all the library's features.

 

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@Hardik02 wrote:

How i can know the exact memory size used by library? 

---

Analyse the Map file (aka the Linker listing).

nm is a tool to do that: https://en.wikipedia.org/wiki/Nm_(Unix)

Part of GCC binutils: https://ftp.gnu.org/old-gnu/Manuals/binutils-2.12/html_node/binutils_4.html

Some articles:

https://www.embeddedrelated.com/showarticle/900.php

https://interrupt.memfault.com/blog/get-the-most-out-of-the-linker-map-file