Re: [Boost-build] newlines added to output of SHELL commands

From: Andrej van der Zee (mavdzee_at_[hidden])
Date: 2007-04-23 07:13:35

Thanks!

I found another way to do this by using the shell's
printf command (it chops off newlines). For example:

local dir = [ SHELL "printf \"%s\" `apxs2 -q
INCLUDEDIR`" ] ;

It works fine for this example, but somehow bjam
removes whitespaces int the result of printf, so it's
use is limited.

Greets,
Andrej
 

--- Jorge Suit Perez Ronda <josp.jorge_at_[hidden]>
wrote:

> There was a discussion about that in this forum, but
> I can not find de 
> thread. The work around is to remove the newline
> after getting the 
> output from the SHELL command:
> 
> rule trim-nl ( str )
> {
>   return [ MATCH "([^
> ]*)" : $(str) ] ;
> }
> 
> local incldir = [ trim-nl [ SHELL "apxs2 -q
> INCLUDEDIR" ] ] ;
> 
> note that MATCH receive a regular expression with
> the newline inside it, 
> you should not write "([^\n]*)"
> 
> hope it helps,
> 
> 
> Andrej van der Zee wrote:
> > Hi,
> >
> > I was wondering why the shell-command adds
> newlines to
> > the output. This makes this feature rather
> useless.
> > For example:
> >
> > local incldir = [ SHELL "apxs2 -q INCLUDEDIR" ] ;
> >
> > lib name
> >         : [ glob *.cpp ]
> >         : <include>$(incldir)
> >         ;
> >
> > Produces the following two (!) commands:
> >
> >  "g++"  -ftemplate-depth-128 -O0 -fno-inline -Wall
> -g
> > -fPIC   -I"../../src/cgi" -I"/usr/include/apache2
> > " -I"/usr/local/ss50/include" -c -o
> > "bin/gcc/debug/mod_authen.o" "mod_authen.cpp"
> >
> > If you look closely there is a newline in the
> include
> > for apache2.
> >
> > I cannot think of any reason why the newline is
> added.
> > Moreover, how can I make this to work?
> >
> > Thanks,
> >
> > Andrej
> >
> >
> >
> >
> >
> >      
>
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