How to use precompiled header?

Hei Chan <structurechart@xxxxxxxxx> · Wed, 23 Jun 2010 00:19:12 -0700 (PDT)

Hi,

I am new to the precompiled header.

I have read about 
it online.

But I still don't fully understand how I can use a 
precompiled header in a 3rd party library.

For example, I have:
- /opt/3rdPartyLib/src/A/B.h
- /opt/3rdPartyLib/src/A/B.h.gch

Then, I tried to compile my code with:
g++ -I/opt/3rdPartyLib/src -H 
-include A/B.h -o myApp.o myApp.cpp

But I got:
x 
/opt/3rdPartyLib/src/A/B.h.gch

So it seems like for some reasons, /opt/3rdPartyLib/src/A/B.h.gch isn't used.

My user doesn't have 
read-write permission to /opt/, but it does have read permission to 
/opt/3rdPartyLib/src/A/B.h.gch tho...so I think that the permission is 
fine.

Any suggestion?

Thanks in advance.

Cheers,
Hei