macro '__OPTIMIZE__' and PCH

Clang Frontend
#1

Hi,

if I build a pch with let's say -O3 and then later use it for a compilation without any -O option, then clang stops with the error

error: the macro '__OPTIMIZE__' was defined in the PCH file but is currently undefined

I thought that clang pch were, contrary to gcc's ones, only pre-tokenised headers. I must be wrong obviously. Could somebody elaborate on this issue?

Luc Bourhis

#2

Clang has pretokenized headers (PTH), but nowadays it also has precompiled headers.

Sebastian

#3

Clang has pretokenized headers (PTH), but nowadays it also has precompiled headers.

My misunderstanding then. Could you point me to the user's documentation for PTH then? Unless I missed something, the user's manual discusses only PCH (http://clang.llvm.org/docs/UsersManual.html#precompiledheaders).

Thanks,

Luc