[jamming] BJam's command/shell execution

[Diane Holt]

I haven't used bjam myself, but have you tried:

REV = [ Shell "svnversion" ] ;

Diane

On 3/23/07, Joshua ChaitinPollak <jpollak at kivasystems.com> wrote:
>
> I saw that, but I can't figure out how to make it work...
> I thought the syntax would be something like:
>
> Shell "svnversion" : $REV ;
>
> But that doesn't work.
>
> Also, and this may be because of the way I'm using bjam, but it seems to
> be conflicting with Jam's Shell command (Which seems to check the file is a
> shell script, and then chmod's it?).
>
> -Josh
>
> On Mar 23, 2007, at 11:46 AM, Diane Holt wrote:
>
> Boost Jam has this (it's what I patterned the Command built-in after):
>
> The SHELL Rule
>
> rule SHELL ( command )
>
> SHELL executes *command*, and then returns the standard output of *command
> *. SHELL only works on platforms with a popen() function in the C library.
> On platforms without a working popen() function, SHELL is implemented as a
> no-op. SHELL works on Unix, MacOS X, and most Windows compilers. SHELL is a
> no-op on Metrowerks compilers under Windows.
>
>
> On 3/22/07, Joshua ChaitinPollak <jpollak at kivasystems.com> wrote:
> >
> > Hi,
> >
> > I'm using BJam, and I can't figure out how to get the shell script
> > execution working. I know there was a recent thread about a COMMAND
> > patch for Jam, and I'm looking forward to that, but for now I'm using
> > BJam and I don't have the time to apply patches and compile, etc.
> >
> > I've ported most of my project to Jam, but I have one Makefile I
> > can't figure out how to ditch. I have this Makefile code:
> >
> > REVISION := $(shell svnversion)
> > OLD_REVISION := $(shell cat revision.cpp 2> /dev/null)
> >
> > revision.cpp:
> > ifeq (,$(findstring \"{REVISION}\", ${OLD_REVISION}))
> >    @echo "void config::getRevision(std::string& rev) { rev = \"$
> > {REVISION}\"; } >> revision.cpp
> > endif
> >
> > This (should) effectively (re)builds revision.cpp if the revision has
> > changed. My program depends in revision.cpp, so if revision has
> > changed, the file gets rebuild and the program gets rebuilt.
> >
> > How would I do this in a Jam way? I guess I could call a shell script
> > to build the revision.cpp file all the time, but I'd rather not
> > unless its out of date.
> >
> > -Josh
> >
> > --
> > Joshua ChaitinPollak
> > Software Engineer
> > Kiva Systems
> >
> > _______________________________________________
> > jamming mailing list  -  jamming at perforce.com
> > http://maillist.perforce.com/mailman/listinfo/jamming
> >
>
>
> --
> Joshua ChaitinPollak
> Software Engineer
> Kiva Systems
>
>
>
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