Cross compile error question: i686 to powerpc--linux-gnu
William A. Gatliff
Wed Oct 17 10:54:00 GMT 2001
Oh, one other thing. See my article on running Linux on the
Dreamcast, at http://www.billgatliff.com/articles/index.html . There
is a rudimentary build process described in there for glibc.
On Wed, Oct 17, 2001 at 12:44:44PM -0500, William A. Gatliff wrote:
> Gcc is a "frontend" that invokes the compiler proper, assembler,
> linker and other utilities as needed. That way, you can just do:
> $ gcc hello.c
> And get the expected results, at least after everything is set up.
> > Why does GCC need all of these libraries recompiled to output
> > standard C code? I can understand that the linker and assembler
> > might need to know more about the hardware, but why is it so hard to
> > get GCC to just spit out the right code to binutils? The binutils
> > has (seemingly) been the most painless up to this point.
> It doesn't. It just looks that way because gcc comes with some
> pre-configured stuff in its "specs" file, the file that controls what
> gcc does and when.
> To see all of what gcc is doing, use the -v option. To just translate
> a file to asm, use -S. To compile to an object file, use -c.
> > Anyway...long story short...if we want to provide our own library
> > support, do I NEED to go any further than making the bootstrap
> > compiler? I'm not going to use Linux, I'm not going to use GNU
> > (most likely)...so, am I going too far in something I don't need to
> > do?
> I'm not sure. There are little "helper functions" inside gcc that
> deal with some of the functionality that gcc assumes microprocessors
> don't have, like support for arbitrary bit shifts on some targets.
> Some of these helper functions are written in C, and need header files
> in order to build properly. So you *may* need to build glibc/newlib,
> just to get the header files that gcc needs to build its internal
> The main offender here is libiberty, although I don't know if you need
> what's in there or not (I don't recall exactly *what's* in libiberty
> myself). There are other libraries as well, whose identities will be
> exposed by the -v option during compilation and linking.
> I know libiberty isn't built until after the all-gcc target, which
> means you don't get it in a bootstrap compiler, and if you don't need
> it then you don't need to go beyond the bootstrap stage. I don't
> recall when the other libraries are built, but if they come after
> all-gcc then you'll probably have to build the complete toolchain to
> get them.
> > Is there some integration with binutils that's going on here I don't
> > understand?
> Yes. Your gcc is acting on the contents of the default "specs" file,
> which includes things like "link in these runtime libraries, and pass
> these options to as and ld". That's where the confusion is coming
> With -c or -S, gcc is *just* a compiler. Well, it invokes *just* the
> compiler, that is. But you get the idea.
> Bill Gatliff
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