Re: Pre-parsing source files before building

Hi Chris,

The GenFile rule is designed to run a tool that can process
a source
into another source. You just have to make sure that the
output target
is your input target for the Main. Order isn't important
because Jam
creates an in-memory dependency tree before it determines
what to
update, thus your dependencies must be correct. Try just
this:

GenFile out_genfile1.c : tool genfile1.c ;
Main target : out_genfile1.c ;

Here, out_genfile1.c is preprocessed by "tool"
from genfile1.c - on
windows it will expect to find tool.exe - so you can replace
the name
with your custom tool. Put your tool in the same directory
for now and
try the above. Once you have that working, you can move on
and process
your list of genfile's by calling GenFile for each one.

Craig.


On 8/23/07, Chris <syndicate_dragonyahoo.com> wrote:
> 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 <cjamallsopgmail.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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