[Development] Enabling -fPIE globally

[Thiago Macieira]

Hello

Olivier has just uploaded a change ( http://codereview.qt-project.org/14528 ) 
that enabled -fPIE in all application builds and I support him. He also added 
a static assertion check for ELF builds without position-independent code, so 
that people using other buildsystems are reminded to turn -fPIE on too.

If you have a problem with this, speak up. Linux distributors, especially, let 
us know what you think.

For more background, please read my blogs on the "sorry state of libraries on 
Linux". But the summary is: function pointer comparison is broken with current 
versions of gcc and the -Bsymbolic-functions option we've made the default.

See also:
http://macieira.org/blog/2012/01/sorry-state-of-dynamic-libraries-on-linux/
http://macieira.org/blog/2012/01/update-and-benchmark-on-the-dynamic-library-
proposals/
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19520
http://sourceware.org/bugzilla/show_bug.cgi?id=13600

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
     Intel Sweden AB - Registration Number: 556189-6027
     Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden
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