Mbed build vs clean build

[JohnnyK (Jan Kamidra)]

Hello,

for speed up you can try this

How to shorten compilation time up to six times

Hello folks, I saw several posts on the forum advising to use the .mbedignore configuration file to reduce the compilation time and binary size. However, I haven’t seen specific examples. Here, I’d like share a .mbedignore file I use in my projects. It tries to group Mbed main features enabling to add them one by one as needed. If one adds this file to the root directory of a project it can significantly shorten the compilation time. For example, in case of building a simple blinky project for …

My basic understanding…

• When you first time press build then all .cpp files are precompiled and that take long time.
• When you you press it second time then it will be compiled only changed files, if the changes are not huge like a configuration and so on. That compilation is much faster because most of content is precompiled from first compilation.
• The Clean Build will “delete” all precompiled sources and it is re- builded again from start like with first compilation, and of course it take long time. Anyway it is useful. Sometimes happens, it occurs to some error during changing a configuration or something similar. And then you need to use clean build.

BR, Jan