Question

Suppose you have 2 files:

• A.h and
• A.cpp, where A.cpp includes A.h

You precompile your header to A.h.gch and delete A.h

Having 2 files:

• A.cpp and
• A.h.gch,

How do you compile a final product, using g++?

In my case, g++ is complaining that .h file is nowhere to be found.

Answer 1

I’m not expert, but from Wikipedia:

GCC can only use the precompiled version if the same compiler switches are set as when the header was compiled and it may use at most one.

I’ve tried:

g++ a.h
rm a.h
g++ -c a.cpp

you can see if g++ is using it with:

g++ -H -c a.cpp

! a.h.gch
a.cpp