Whole Program Optimization

[Josh]

Hi

On following the page for Lazarus Project Optimization
https://wiki.freepascal.org/Whole_Program_Optimization
I am getting odd results, so either its me, or something is missing.

I have set up 2 xtra build modes for my project pass 1 and pass 2, according to the above document.
After I compile with Pass 1 then Pass 2, my project is 56MB where as my project with just O2 Smart Link etc, comes out at just 15MB.

I suspect I have missed something. I do note that the fpc example has an extra step...

Any thoughts...

EDIT Just Noticed 4 digit posts..

[BrunoK]

Debug info ?

[Josh]

Hi

Pass 1, Pass 2, MyRelease Build modes do not have any debug info included, the Pass 1 and Pass 2 are copies of MyRelease Build mode with the addition of

Pass 1

-FWtempwindows.wpo
-CX
-XX
-Xs-
-OWDEVIRTCALLS
-OWOPTVMTS

Pass2

-Fwtempwindows.wpo
-CX
-XX
-Xs-
-OwDEVIRTCALLS
-OwOPTVMTS

[marcov]

The collection phase should not have stripping enabled according to the wiki?

[Josh]

Hi

I unchecked the strip in both Pass 1 and Pass 2, The exe is still 56MB

I created a Third Mode Release WPO Final and put

-Fwtempwindows.wpo
-CX
-XX
-OwDEVIRTCALLS
-OwOPTVMTS

When I run this after Pass 1 and Pass 2 My Exe is 13.6MB

Observation note, if your active build is pass 2, and you build many with pass 1and pass 2 in that order, because pass 2 is active mode, this is compiled first...

[Fred vS]

Hello.

Did you try with and without -B ?

[Josh]

Hi Fred

I cannot compile for all Build Modes, as I have Build for Win32,Win64,Carbon,Cocoa, each has a debug and release mode.
I was having issues with crosscompiling, so I have a Lazarus 32 Installation and Seperate 64 Installation, and The Mac Build options are for Actual Mac Installation on an old snowleopard system, and MacMini M1 on Monterey,

[Fred vS]

Hello Josh.

OK, i do also cross-compilation but I noted that, sometime, if compiling without -B parameter (build all) there was strange result.

So now, to avoid problems, I always use -B (even if it will rebuild all the units and take more time).
That said, maybe it is not related to your problem but, in case of...

[Josh]

Hi Fred,

I agree, before doing any 'Final Build' I go to Run/Clean Up and Build, and just delete the files. Then I build

I have Done this with this, but Pass 1 and Pass 2 endup with large file.

[Fred vS]

Not sure about your parameter -Xs- ( the - at end ).
I use this to strip:

Code: [Select]

-XX -CX -Xs

[Josh]

Hi Fred vS

The options are put in using,  Project Option, Custom Option, AllOptions, then scrolling and enabling the relevent paramters to add
 

[Fred vS]

Hello Josh.

I just try with a demo console program in Linux 64 bit:

Code: Pascal  [Select][+][-]

1. fpc -XX -CX -Xs- test.pas

Result: 2.1 megas.

Then the same with -Xs (without - at end):

Code: Pascal  [Select][+][-]

1. fpc -XX -CX -Xs test.pas

Result: 0.9 mega.

[Fred vS]

Hi Fred vS

The options are put in using,  Project Option, Custom Option, AllOptions, then scrolling and enabling the relevent paramters to add

Here with Lazarus 2.2.4 when selecting -Xs, it does not add a "-" at end.

[Josh]

Hi Fred vS,

Confirmed if I remove the trailing - from the -Xs-, then it works correctly.

Looks like the Wiki Needs Checking/Changing.
Where I got my info from https://wiki.freepascal.org/Whole_Program_Optimization
for both FPC and Lazarus

[Fred vS]

Looks like the Wiki Needs Checking/Changing.
Where I got my info from https://wiki.freepascal.org/Whole_Program_Optimization
for both FPC and Lazarus

Hum, indeed that picture:
https://wiki.freepascal.org/File:02_Linux_WPO_Pass1.png

Needs some work with LazPaint.