[Boost-build] Conditional foo

From: Mark Evans (evans_mark_at_[hidden])
Date: 2007-05-02 14:34:31

Hi guys,

I would like for a Jamfile to conditionally run a unit test only if the
toolset is gcc.  My naive attempt was the following.
-----
rule conditional-unittest ( targets * : sources * : properties * )
{
  if <toolset>gcc in $(properties)
  {
    run testing/foo.c libFOO ;
  }
}

make unittest : : conditional-unittest ;
-----

but this fails with:

/cygdrive/c/cygwin/usr/local/tools/boost-build/build/targets.jam:307: in
object(project-target)@66.add-alternative from module
object(project-target)@66
error: add-alternative called when main targets are already created.

Is there a way to test the toolset property in a Jamfile with something like

if [ get-toolkit ] = gcc
{
    run ...
}

Many thanks,
Mark