Precompiling disabled in qt-copy/configure

[Simon Hausmann]

On Saturday 17 July 2004 15:55, ismail dönmez wrote:
> Hi all,
>
> I noticed precompiling on unix is disabled with r1.62 of configure see
> http://webcvs.kde.org/cgi-bin/cvsweb.cgi/qt-copy/configure.diff?r1=1.61&r2=
>1.62&f=h . Is there any reason for this change? It seems to work.

The configure test that upon success enables pch support is disabled because 
even though that test might succeed, pch may still fail later on. gcc's pch 
functionality currently relies on mmap() mapping the file at the same 
location as it was when saving, which unfortunately does not work all the 
time, especially not in security enhanced systems with for example mmap 
deliberately trying to use random mappings.

Plus certain gcc releases abort with ICEs when compiling the C code in 
src/3rdparty/ in combination with pch.

The next Qt 3.3.x bugfix release will have a configure switch for pch that 
allows you to enable that configure test. (which then upon success enables 
pch)

Simon