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

From: Jorge Suit Perez Ronda (josp.jorge_at_[hidden])
Date: 2007-04-23 05:37:58

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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