[cfe-dev] PTH questions

[Mike Stump]

On Apr 4, 2009, at 2:04 AM, Robert Purves wrote:
> 1. What does 'T' in PTH stand for? Tokenized, toasted...?

Tokenized.

> 2. The command  clang test.h  produces the expected file test.h.gch.
> Is this file recognised and used automatically in subsequent
> compilations containing #include "test.h" (as gcc does),

The design of gcc is to have that work.  I don't think clang does that  
yet, but in time it may.

> or is it  necessary to add the option -include-pth=test.h.gch?

My take, please don't do that.  -include test.h is the correct spelling.

> 3. -include-pth hates to have the '=' omitted:
> $ clang -c test.c -o test.o -include-pth=test.h.gch
> $ clang -c test.c -o test.o -include-pth test.h.gch
> clang: warning: test.h.gch: 'linker' input file unused when '-c' is
> present
> error: PTH file -o could not be read
>
> Is this inscrutable error a bug

Yes, my take, there should not be an -include-pth option to clang.