Small Arduino code consumes high ram usage in VSCode compilation

[joneschung]

As the image shown that a small Arduino test code (board config: Mega2560) consumes a large flash (10%) and ram (51%) usage after compilation, is there anything I missed? Thanks in advance for any hints.

Here is the code
testRotary.ino:

#include <a.h>

void setup()
{
    int a = 0;
}

void loop()
{
    int b = 1;
}

and a.h is just an empty file existed in somewhere that the path Arduino can include as libraries.

Here is the reply of compilation:

[Starting] Verifying sketch 'sketches\testRotaryText\testRotary.ino'

Please see the build logs in output path: d:\OneDrive\Projects\TrainDetectAlarm\build

Loading configuration...

Initializing packages...

Preparing boards...

Verifying...

Sketch uses 26984 bytes (10%) of program storage space. Maximum is 253952 bytes.

Global variables use 4208 bytes (51%) of dynamic memory, leaving 3984 bytes for local variables. Maximum is 8192 bytes.

IntelliSense auto-configuration disabled.

[Done] Verifying sketch 'sketches\testRotaryText\testRotary.ino'

---

[J-M-L]

What happens if you don’t include a.h ? What’s in there ?

Side note:
Please never post a picture of text again. Just post text using code tags (for the code and compiler message ). please read How to get the best out of this forum

[joneschung]

the reply is normal if no include a.h:

Sketch uses 662 bytes (0%) of program storage space. Maximum is 253952 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 8183 bytes for local variables. Maximum is 8192 bytes.

[Coding_Badly]

What else is in that TdaUI directory?

[J-M-L]

@joneschung

the reply is normal if no include a.h:

Well then the answer is in what you did not share… may be you have other ino files, may be some code that loads anyway or whatever…. Share details

[build_1971]

Is a a true library or is it in the same directory as your .ino file?
You could try
#include "a.h"
There might be somewhere in the search path another a.h....
Maybe such a short name is not a good idea...

[b707]

@joneschung
Why did you decide that the code is small? Everything that is in the file included by the #include directive is also a part of the code. Maybe you have 10 thousand lines of code there - that's how the size of the firmware turns out