[CMake] How to guarntee the sequence of build if no target can be used

[Dong Tiger]

Thanks. It works.

2009/6/1 Alexander Neundorf <a.neundorf-work at gmx.net>

> On Monday 01 June 2009, Dong Tiger wrote:
> > 2009/5/29 Alexander Neundorf <a.neundorf-work at gmx.net>
> >
> > > On Thursday 28 May 2009, idlecat511 at gmail.com wrote:
> > > > Hi,
> > > >
> > > > This situation is:
> > > >
> > > > foo.h is generated from foo.x. And foo.h is included by bar.h. And
> then
> > > > bar.h is included by a lot of c files. So actually every c files
> > >
> > > including
> > >
> > > > bar.h depends on foo.h.
> > > > But the file number is so big that I don't want to add dependency for
> > >
> > > each
> > >
> > > > one.
> > > >
> > > > How can I specify foo.x is generated before all the c files being
> > >
> > > compiled?
> > >
> > > > It seems add_custom_target works but it will regenerate foo.h every
> > > > time even the foo.x is not modified.
> > >
> > > You should use
> > > add_custom_command(OUTPUT <fullpath>/foo.h
> > >                   ... )
> > >
> > > and then list that generated file as a source file for your target:
> > >
> > > add_library(blub <fullpath>/foo.h foo.c bar.c ...)
> >
> > I know by this way, if foo.h is changed, blub will be rebuilt. But what I
> > need is foo.h is guaranteed to be up to date before foo.o is built.  I am
> > not sure if this command is relevant to this. Will cmake try to make sure
> > all the src files are up to date before compiling any .c files?
>
> Yes.
>
> > > This should make sure that everything is up to date.
> > >
> > > The header-file dependency scanning does in general not work for
> > > generated files, you need to list the generated file as source file for
> > > the targets which need it.
> >
> > Another problem is that I am trying to avoid adding dependencies for
> these
> > generated files manually because in my project, there are many generated
> > head files and quite a few .c files including them. I just want to make
> > sure the head files are generated before any .c compilation.
> > ADD_CUSTOM_TARGET can do this but it will regenerate the head files even
> > they are up-to-date.
>
> There should be no need to do this if you use add_custom_command()
>
> Alex
>
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