[jamming] Pre-parsing source files before building

[Chris]

Maybe I should have been more specific. :)

srcfile1.c and genfile1.c are not related. genfile1.c etc are output by a design tool that we use.

Here is another example of something I tried. 


rule PreParse
{
Depends $(1) : $(2) ;
}

actions PreParse 
{
#just a place holder for the script I need to run
echo "Preparsing!"
}

rule AuxSrc
{
   Depends $(1) : $(2) ;
   PreParse $(1) : $(2) ;
   Objects $(2) ;
}

rule BuildLib
{
   Depends $(1) : $(2:S=.OBJ) ;
}

actions BuildLib
{
$(AR) r $(AUXLIB) $(AUXOBJ)
}

AuxSrc $(AUXLIB) : $(AUXSRC) ; 
BuildLib $(AUXLIB) : $(AUXSRC) ;
Main  $(LINKTARGET) : $(SRC) ;
Convert $(FINALTARGET) : $(LINKTARGET) ;


This didn't work, because the source files were being compiled before the PreParse rule was being invoked. No matter what I did, I couldn't get the PreParse action to run before the Objects was invoked.

I think the problem is that when the source files are generated, they're newer than the target, so the tool assumes they need to built - which is true, except that I need to do this other step to them first.

I feel like I'm close, but there is some fundamental idea I'm missing. Any more ideas?

Thanks
Chris


Craig Allsop <cjamallsop at gmail.com> wrote: Hi Chris,

I'm assuming srcfile1.c is converted to genfile1.c and then linked in
the final program? So to make it easier to write in jam, can we just
add a gen prefix for the generated files so that srcfile1.c is
converted to gensrcfile1.c? Therefore you would do this...

LINKTARGET = flash.hex
FINALTARGET = app.bin
MAINSRC = srcfile1.c srcfile2.c ;
for i in $(MAINSRC)
{
  # this will run: yourpreparsetoolhere outfile infile
  GenFile gen$(i) : yourpreparsetoolhere $(i) ;
}
Main $(LINKTARGET) : gen$(MAINSRC) ;
Convert $(FINALTARGET) : $(LINKTARGET) ;
Depends all : $(FINALTARGET) ;

Only pass the generated sources to Main, gen$(MAINSRC) will be
expanded to prefix all source with "gen". If you have others you don't
then just list with as extras.

Hope that helps.

Craig.

On 8/21/07, Chris  wrote:
> We have a tool which generates some of our source files. Unfortunately, the
> files need to be touched up a bit before our cranky compiler can use them. I
> am trying to make this pre-parsing an automated part of the jam build
> process, but I'm having some trouble finding the right magic words to make
> it work. The problem seems to be that the files may already exist and need
> not be parsed again if they have not changed from the previous build. I'm
> having a hard time coming up with a rule/dependencies that can detect if
> generated source files are newer than the final target and run the
> pre-parsing script on them before compiling them. The script we have
> automatically fixes all of the generated files, so it only needs to run
> once.
>
> Here's what I have so far, which seems to work except for the pre-parsing
> step. AUXSRC are the sources generated by the tool. There are custom actions
> for Cc and Link to deal with our stupid compiler. I can detail those if
> someone thinks it necessary, but for brevity they are omitted here. The
> "Convert" rule/action handles converting the linker output to our download
> format.
>
> LINKTARGET = flash.hex
> FINALTARGET = app.bin
> MAINSRC = srcfile1.c srcfile2.c ;
> AUXSRC = genfile1.c genfile2.c ;
> SRC = $(MAINSRC) $(AUXSRC) ;
>
> Main $(LINKTARGET) : $(SRC) ;
> Convert $(FINALTARGET) : $(LINKTARGET) ;
> Depends all : $(FINALTARGET) ;
>
>
> Thanks,
> Chris
>
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