Re: [Boost-build] qcc toolset

From: Juergen Hunold (hunold_at_[hidden])
Date: 2006-02-19 07:38:08

Hi Jim !

On Friday 17 February 2006 17:00, Jim Douglas wrote:
> Vladimir Prus wrote:
>
> ******************
> 1. The "-ftemplate-depth-100" is incorrect because it is hard coded
> into the gcc action. It should be "-Wc,-ftemplate-depth-100"

Well, that one should really be configurable. And its value is 255 in 
the gcc toolset of V1, by the way...

> *****************
> 1. The "-Wc,-fPIC" option should be "-Wl,-fPIC". c = compiler, l =
> linker ****************

No. -fPIC is a valid gcc _compile_ option.
"man gcc" yields (gcc-4.0.2 debian unstable)

--- snip--
      -fPIC
 If supported for the target machine, emit position-independent code, 
suitable for dynamic linking and avoiding any limit on the size of the 
global offset table.  This option makes a difference on the m68k, 
PowerPC and SPARC.
Position-independent code requires special support, and therefore works 
only on certain machines.
--- snap ------

Those "certain machines" also contains AMD64. I encountered linking 
problems on this platform due to the fact that "-fPIC" was not set 
while doing compilation. I don't think this flag does anything harmful 
when set and having no effects, so we should set it when compiling code 
for shared linking...

Yours,

Jürgen

-- 
* Dipl.-Math. Jürgen Hunold  ! Ingenieurgesellschaft für 
* voice: ++49 511 262926 57  ! Verkehrs- und Eisenbahnwesen mbH  
* fax  : ++49 511 262926 99  ! Lister Straße 15
* hunold_at_[hidden]          ! www.ive-mbh.de