ESP32 Forum

Hello other developers.
ESP32 takes minutes to compile. How do you guys live with the long compiling time?
Every change takes minutes to verify.

I guess at the later stage in the development it is probably fine.
But at beginning it is really slowing things done!

Thanks

Paul

The initial build takes a bit. On my system it takes 15 seconds. Once you make a change it will recompile just that file. So it sounds like you possibly got something messed up in your setup install.

Make sure you add the -jx option to make. I.E. make -jx. where x is how many cores your PC has.

I think -jx is x = 2 x cores because each core supports two threads. Also if you are running win10 you should disable defender from scanning your development directory.

John A

I think -jx is x = 2 x cores because each core supports two threads.

Correct. My current system is a 8 core. so that would be: make -j16. I should have been more clear, just assumed people knew.

Yes, after the initial build only changed source files should be compiled.

The only exception is if you edit the menuconfig. In this case all files need re-compilation with the new config settings.

If you're not seeing this, it may be a bug - please provide some more details so we can help you figure it out.

As others have said, running "make -jN" and (on Windows) disabling Defender or adding Defender exceptions for IDF paths & tools will improve performance a lot.

You can also get better Windows performance by moving to the new CMake build system, but Eclipse support for this is still pending. https://docs.espressif.com/projects/esp ... ted-cmake/

I am running it on Windows 7.
This is the build output when I start build:
23:08:25 **** Incremental Build of configuration Default for project blink ****
make -j8 all

Output.txt attached.
I didn't change any code. Just compile, it always takes almost a minute to finish.

I compiled the project in mingw32 command line.
It only compiles the changes. and much faster.
I attached the output.

So there much be some setting in Eclipse messed up the build?

Thanks

Paul

Hi Paul,

There's more console output in the Eclipse log, but you'll probably get the same console output in MINGW with "make V=1" - verbose output.

48 seconds is a long time, as the Eclipse build log shows that nothing was actually compiled (it just looks at each component and says "nothing needs compiling here").

What ESP-IDF version do you have?

My ESP-IDF version:

Paul@W510 MINGW32 ~/esp/esp-idf
# git describe
v4.0-dev-311-g70eda3d22


Thanks

Paul