Re: [Mingw-users] dependencies and resource files

[Manu <ma...@wa...>]

Greg Chicares wrote:


> > manubee wrote:
> >
> > To generate dependencies from a resource file,
> > the following works as expected:
> >
> > cpp -E -MM rsrc.rc -MT
../objdebug/rsrc.o -MP -I../include -I../winui/include -DDEBUG -DDEBUGF -D_WIN32_IE=0x0400 >
> > ../src/_deps/rsrc.Po
> > But using $(CC) -E or $(CPP) doesn't:
>
> I usually set $(CPP) explicitly in my makefiles, like
>   CPP = cpp
> but if you rely on make's builtin rules I think you get
>   CPP = $(CC) -E
> which will give the problem you observe.

That's correct.
CPP = cpp doesn't work under Wine.
CPP = $(CC) -E doesn't work with rc files. (Under Windows)

> > gcc -E -MM rsrc.rc -MT
../objdebug/rsrc.o -MP -I../include -I../winui/include -DDEBUG -DDEBUGF -D_WIN32_IE=0x0400 >
> > ../src/_deps/rsrc.Po
> > gcc: rsrc.rc: linker input file unused because linking not done
>
> gcc does not recognize the '.rc' suffix, so it sees the .rc file as
>   "An object file to be fed straight into linking."

Ok, I see.
Well, I tend to think that rc files should be recognized under Windows,
particularly if we stop after the preprocessing stage.

>   http://gcc.gnu.org/onlinedocs/gcc-3.3.1/gcc/Overall-Options.html
> Try telling it to treat the source as though it were C:
>
>  gcc -x c -E -MM rsrc.rc [...]

:) It works fine. That's a very good trick.

But there's another problem. Such $(MAKEDEPEND) macro works
only for C files. For example:

gcc -x c -E -MM main.cpp -MT
../objdebug/main.o -MP -I../include -I../winui/include -DDEBUG -DDEBUGF -D_WIN32_IE=0x0400 >
../src/_deps/main.Po
main.cpp:35:47: warning: new: No such file or directory

In main.cpp, line 35:
#include <new>


> > The problem with "cpp -E" is that makefiles are not portable.
> > For example, it is required to patch the
> > makefiles to build under Wine.
>
> Does wine not have a C preprocessor called 'cpp'?

I don't think so, it is more likely 'winecpp'.
For example, my makefiles use the following to build
under Wine: (submitted by Wine friends :)

ifndef WINE
CC = gcc
CXX = g++
RC = windres
else
CC = winegcc
CXX = wineg++
RC = wrc
endif

I never built the sources myself under Wine, but maybe
overwriting $(CPP) the same way would work.

Thanks for the good information,

Manu.