Re: [Boost-build] [Boost][build] Bjam ordering source $(>) list

Subject: Re: [Boost-build] [Boost][build] Bjam ordering source $(>) list
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2009-06-25 18:49:58

AMDG

K. Noel Belcourt wrote:
> In jam/src/make1.c, make1list(), I find this comment
>
> * make1list() - turn a list of targets into a LIST, for $(<) and $(>).
>
> which seems like the place where I could ensure that sources for, say 
> a link action $(>) are ordered so that objects occur before archives 
> or shared libraries.  Some background.
>
> We're bringing up support for linking Fortran programs and have 
> discovered that when linking C programs, the objects in $(>) always 
> precede the libraries, which is good since the main is often in an 
> object file.  This is an issue if, for example, your linker doesn't 
> support start / end group and the library precedes the object 
> containing main (you get linker errors).

I'm not quite sure that I follow.  Libraries ought to be in a separate 
variable from sources.

> In our case, it seems that our objects always precede any libraries 
> when linking with C, but when linking with Fortran, we find the 
> libraries precede the objects and, hence, we get linker errors.
>
> Back to make1list().  It seems like this is the place where the list 
> of sources and targets for an action are turned into a list for $(<) 
> and $(>).  Does anyone know (1) if bjam intentionally sorts objects 
> before libraries for $(>) and, if it does as it seems to, (2) where is 
> to code in bjam that does this?

The order of the targets ought to be controlled by Boost.Build in 
gcc.link for example.

In Christ,
Steven Watanabe