Stop using precompiled headers for Linux?

[Magnus Ihse Bursie]

On 2018-11-02 15:00, Magnus Ihse Bursie wrote:
> So obviously this is a nice improvement even here. I could probably 
> try around a bit and see if there is an even better fit with a 
> different selections of header files, but even without that, I'd say 
> this patch is by itself as good for clang as it is for gcc. 

I could not improve matters much. There was very small differences 
between setting the limit at 110, 130 (BKM), 150 or 200:

real    3m6,322s
user    19m3,000s
sys    1m41,252s
hotspot new pch BKM (on and above 130)

real    3m6,309s
user    19m2,764s
sys    1m41,488s
hotspot new pch on and above 110

real    3m7,515s
user    19m6,470s
sys    1m42,345s
hotspot new pch on and above 150

real    3m8,497s
user    19m15,851s
sys    1m42,494s
hotspot new pch on and above 200

/Magnus