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aoineko-fr / MSXgl

The MSX Game Library in C language
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Skipping already compiled files #1

Closed jbikker closed 2 years ago

jbikker commented 2 years ago

Hi,

I admire your great DOS batch file skills (seriously), but I managed to make an improvement, that makes SDCC skip files for which the compiled output is newer than the source file. This makes compiles instantaneous if only small changes were made, which helps me drink less coffee. Here is the relevant snippet:

rem ***************************************************************************
rem * COMPILE C SOURCE                                                        *
rem ***************************************************************************
if /I %FileExt%==.c (

    rem Find out if the source file changed:
    copy %File% %OutDir% /Y >NUL
    cd %OutDir%
    for /F %%i in ('dir /B /O:D %FileName%.c %FileName%.sym') do set Newest=%%i
    cd ..

    if /I !Newest! NEQ %FileName%.c ( 

        echo Skipping !FileName!.c: up-to-date.
        goto :SkipThisFile
    )

    set AddOpt=%CompileOpt%
    if /I %Optim%==Speed (set AddOpt=!AddOpt! --opt-code-speed)
    if /I %Optim%==Size (set AddOpt=!AddOpt! --opt-code-size)

    set SDCCParam=-c -mz80 --vc -DTARGET=TARGET_%Target% -DMSX_VERSION=MSX_%Machine% -I%ProjDir% -I%LibDir%\src -I%LibDir%\content !AddOpt! %File% -o %OutDir%\

    echo %BLUE%Compiling %1 using SDCC C compiler...%RESET%

    echo SDCC !SDCCParam!
    %Compiler% !SDCCParam!

        if errorlevel 1 ( goto :Error )

)

:SkipThisFile

Information from stackoverflow was used: https://stackoverflow.com/questions/1687014/how-do-i-compare-timestamps-of-files-in-a-batch-script https://stackoverflow.com/questions/14686330/how-do-i-make-a-windows-batch-script-completely-silent because I don't know much about batch files. ;)

Greets, Jacco.

aoineko-fr commented 2 years ago

Good tip. I thought about this kind of optimization, but I don't know if it's a good idea to try to recreate the Makefile system in batch. ^^ I hesitate a lot, but I'm more inclined to rewrite the Build tool in python to make it more easily modifiable and functional on all OS. In the meantime, I will integrate a date time check as you suggest.

aoineko-fr commented 2 years ago

I added an option in the Build Tool CompileSkip to skip compiling file if build data is newer than source https://github.com/aoineko-fr/MSXgl/commit/39194dc00398387ea626754c4331bd20c6fcd275

There are many things that would be so much easier to do in Python... I'll look into it.