http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57242
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2013-05-13
Ever confirmed|0 |1
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to etherice from comment #4)
> (In reply to Andrew Pinski from comment #1)
> > This is by design as -g changes the information produced by the front-end
> > and maybe even predefines too.
>
> I created a simpler test to demonstrate the bug. Two files:
>
> ----------
> pch.hpp
> ----------
> #ifndef __PCH_HPP__
> #define __PCH_HPP__
> #pragma message "[ not using pre-compiled headers ]"
> #include <iostream>
> #endif
>
> ----------
> test.cpp
> ----------
> #include <pch.hpp>
> int main() {
> std::cout << "hello world" << std::endl;
> return 0;
> }
>
> ----------
>
> If you run commands [1] and [2] below, you will notice that pch is ignored.
>
> [1] g++ -I. pch.hpp -o pch.hpp.gch
> [2] g++ -I. -c test.cpp -o test.o
> [3] g++ -I. -c test.cpp -o test.o -include pch.hpp
How? I see
rguenther@murzim:/tmp> g++-4.7 -I. pch.hpp -o pch.hpp.gch
pch.hpp:3:19: note: #pragma message: [ not using pre-compiled headers ]
rguenther@murzim:/tmp> g++-4.7 -I. -c test.cpp -o test.o
rguenther@murzim:/tmp> g++-4.7 -I. -c test.cpp -o test.o -include pch.hpp
rguenther@murzim:/tmp> g++-4.8 -I. pch.hpp -o pch.hpp.gch
pch.hpp:3:19: note: #pragma message: [ not using pre-compiled headers ]
#pragma message "[ not using pre-compiled headers ]"
^
rguenther@murzim:/tmp> g++-4.8 -I. -c test.cpp -o test.o
rguenther@murzim:/tmp> g++-4.8 -I. -c test.cpp -o test.o -include pch.hpp
the issue is probably that there are pre-installed precompiled headers
for libstdc++ which use certain flags. Maybe in your case this confuses
things? (disclaimer: I always install gcc built with --disable-libstdcxx-pch)
Try removing them.
