[jamming] BJam's command/shell execution

[Diane Holt]

Unless bjam has changed the way a var is referenced, try:

Echo REV is $(REV) ;

(Note the parens ... I added the "REV is" so you can see the line, even if
REV doesn't have a value.)

Diane

On 3/23/07, Josh Pollak <jpollak at kivasystems.com> wrote:
>
> On Fri, 2007-03-23 at 08:57 -0700, Diane Holt wrote:
> > I haven't used bjam myself, but have you tried:
> >
> > REV = [ Shell "svnversion" ] ;
>
> That doesn't seem to work:
>
> # Begin Jamfile
> REV = [ Shell "svnversion" ] ;
>
> echo $REV ;
> # End Jamfile
>
> -------------------------------------
>
> jpollak at moya:~/src/myproj$ jam
> $REV
> ...found 8 targets...
> ...updating 1 target...
> Shell svnversion
> /bin/sh: Syntax error: redirection unexpected
>
> awk  '
> NR == 1 { print "#!/bin/sh"  }
> NR == 1 && /^[#:]/ { next }
> /^##/ { next }
> { print }
> ' <  > svnversion
>
> ...failed Shell svnversion...
> ...failed updating 1 target...
>
> Oh well, I'm sure I'm doing something wrong.
>
> -Josh
>
> > 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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