[LLVMdev] cross compiling with the C backend

[Kevin André]

On Feb 19, 2008 5:24 PM, Anton Korobeynikov <asl at math.spbu.ru> wrote:

> > Could you give an example?
> Different alignment issues, for example. LLVM handles alignment
> explicitely by inserting dummy padding fields. Surely, the stuff can be
> different for build platform and for target one.
>
> Also, many platform-dependent stuff in POSIX-aware code (see example later).

I see.

> > I didn't wrote the program :)  No, I just recompile a program that was
> > already written for (or ported to) the PSP. It seems that "setjmp" is
> > used in libpng. The program and the libraries it uses (libpng and
> > zlib) should be correct
> Unfortunately, this cannot be true in your case :( For example,
> longjmp/setjmp accepts struct jmp_buf as an argument, but the contents
> of such struct is highly target dependent (since it used to save current
> context, etc).
>
> There are some places in POSIX standards containing wording of form
> "struct 'foo' should contain field 'bar'" without specifying the precise
> position of this field.
>
> In general, you will need to configure a crosscompiler, or, at least,
> hack llvm-gcc to use correct system headers for your target plaform (not
> for the build!).

Well, I already use custom includes with these options: "-nostdlib
-nostdinc -Ipsptoolchain/psp/include
-Ipsptoolchain/lib/gcc/psp/4.1.0/include". But that seems not enough.
GCC has some target-specific behaviour compiled in?