Compile All vs Compile in FB = different code

Hello.

Yesterday I found very weird thing.
On one old Siemens S7-315 I wanted to make changes. I have some source code, so I wanted to check, if it's the same version as online.
First I made PLC->Compile and download->Compile Only and compiled whole project. Then I made comparison offline vs online and e.g. FB192 was the same.

But when I opened the FB, made compilation without making any changes (with the Compile button) and then again made comparison to online, the block was pretty different (comparison say different code, in details it has different CRC and both lengths).

How is this possible?
I use Step7 v5.6 + SP2 + HF5

Thanks

Hello Benesd,

is the FB dependent of other FBs or FCs, example with CALL-instruction? It could be also a time stamp conflict. I recommend to check the block-consistency and compile and download again.

See also the FAQ:

How do you perform a block-consistency check following changes in the STEP 7 program?
https://support.industry.siemens.com/cs/ww/en/view/5416540

Otherwise I recommend also to update the firmware version of the CPU.

Hello.

From FB192 there are called procedures from block FB100, FC100 and FC102. If I choose partial compilation, there is only this block.

There is no consistency error in this block:

I don't see reason, why time-stemp should change code CRC and length.

Thank you

So after some trial and test we finally found, that problem is in Debug setting.

For some reason Compile all ignores the setting for Compiler in SCL editor:

EDIT: OK, it looks like the "Compile All" use some magic or I don't know.
Even if I check "Overwrite blocks" and whole compilation is executed fine and then I go to blocks, select them all and do Compile (so it made compilation block by block where I always choose overwrite All), I suddenly got errors in some blocks.

Siemens is so much pain for use...