Subject: Re: [Boost-build] gcc visibility support
From: Jürgen Hunold (juergen.hunold_at_[hidden])
Date: 2010-08-23 14:35:54
On Monday, 23. August 2010 20:52:48 you wrote:
> I'm interested in adding support for -fvisibility=hidden to the gcc library
> I can include the following in the Jamfile.v2 of the build directory.
> which bjam seems to accept without complaint. Indeed the gcc command line
> includes -fvisibility=hidden.
> So, so good.
The best solution is direct Boost.Build support as described in issue #2114.
> any help appreciated.
Please find a patch with "works-for-me" status attached.
Invoking "bjam visibility=hidden" should then do the right thing.
> a) visibility is supported in version 4+ compilers. What syntax does one
> use to specify that that the above should only apply to these compilers.
I copied the "real-version" query from darwin.jam and used the version
reported by gcc.
> b) If one is building a static library, presuably the above shouldn't be
> included (though it probably does no harm). How does this modify the above
> c) The cygwin system I use to test has gcc-4.3.4 installed. BUT, the usage
> of -fvisibility=hidden evokes a compile time warning for file. The warning
> says that visibility is not supported on this build - which presumably is
> cygwin. So the above would also have to be conditioned upon the fact that
> cygwin is not being used.
Good question. The idea was to add this logic to "configure-version-specific" by
adding the current properties. I hope this would work somehow.
Hope this little helps.
-- * Dipl.-Math. Jürgen Hunold ! Ingenieurgesellschaft für * voice: ++49 511 262926 57 ! Verkehrs- und Eisenbahnwesen mbH * fax : ++49 511 262926 99 ! Lister Straße 15 * juergen.hunold_at_[hidden] ! www.ivembh.de * * Geschäftsführer: ! Sitz des Unternehmens: Hannover * Prof. Dr.-Ing. Thomas Siefer ! Amtsgericht Hannover, HRB 56965 * PD Dr.-Ing. Alfons Radtke !
Boost-Build list run by bdawes at acm.org, david.abrahams at rcn.com, gregod at cs.rpi.edu, cpdaniel at pacbell.net, john at johnmaddock.co.uk