Hello, Koen.
So my question is: How should I build llvm and llvm-gcc4 to have it cross-compile from x86
to ARM/EABI?
Well, just supply appropriate --host/--target options to configure.
I haven't tried ARM, but this definitely works for crosscompiling from
linux to mingw32. Please also note, that you'll need native (=arm) tools
(binutils, libcheaders, etc) during gcc build process.
Anton Korobeynikov schreef:
Hello, Koen.
So my question is: How should I build llvm and llvm-gcc4 to have it cross-compile from x86
to ARM/EABI?Well, just supply appropriate --host/--target options to configure.
To llvm or llvm-gcc4?
I haven't tried ARM, but this definitely works for crosscompiling from
linux to mingw32. Please also note, that you'll need native (=arm) tools
(binutils, libcheaders, etc)
You mean binutils-cross, right?
during gcc build process.
Building gcc as a crosscompiler is fully automized in OpenEmbedded, I'm trying to add
llvm-gcc4 into that framework.
regards,
Koen
Hi Koen,
The process to build llvm-gcc as a crosscompiler is basically the same
as build a normal gcc as crosscompiler. The differences: you need a
LLVM installed (compiled for the host). You must configure llvm-gcc
with --enable-llvm.
Problems:
- Today LLVM supports ARM/EABI, but llvm-gcc don't. You must apply the patch:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20070319/046070.html
(Please someone commit this patch!)
- If your host system libraries are newer then gcc 4.0, you must
configure llvm-gcc with "--disable-shared" (this is a workaround for a
bug)
It would be great to have llvm-gcc inside OpenEmbedded. The Mamona
project could be the first Linux distribution totally compiled by
llvm-gcc!
Lauro
Lauro Ramos Venancio schreef:
It would be great to have llvm-gcc inside OpenEmbedded. The Mamona
project could be the first Linux distribution totally compiled by
llvm-gcc!
llvm-native 1.9 is in OE[1], I'm now working on getting the cvs version added and when
that works llvm-gcc4 + EABI patch. I'll have to finish a project at the university first,
but a llvm-gcc4 recipe should be ready for testing somewhere between easter and ELC2007.
Any recommended testsuites I could run?
regards,
Koen
[1] http://www.openembedded.org/filebrowser/org.openembedded.dev/packages/llvm
Lauro Ramos Venancio schreef:
Hi Koen,
The process to build llvm-gcc as a crosscompiler is basically the same
as build a normal gcc as crosscompiler. The differences: you need a
LLVM installed (compiled for the host). You must configure llvm-gcc
with --enable-llvm.Problems:
- Today LLVM supports ARM/EABI, but llvm-gcc don't. You must apply the
patch:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20070319/046070.html
That doesn't apply anymore 
regards,
Koen
> - Today LLVM supports ARM/EABI, but llvm-gcc don't. You must apply the
> patch:
> http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20070319/046070.htmlThat doesn't apply anymore
You must use the llvm-gcc4 from the svn. It has some bug fixes that
are important to ARM EABI and the patch should apply cleanly.
Lauro
This patch doesn't break anything on powerpc-apple-darwin8, so I've checked it in
(note that configuration doesn't use the libstdc++ bits, though). Lauro, please keep
an eye open for regressions.
Lauro Ramos Venancio schreef:
Hi Koen,
The process to build llvm-gcc as a crosscompiler is basically the same
as build a normal gcc as crosscompiler. The differences: you need a
LLVM installed (compiled for the host). You must configure llvm-gcc
with --enable-llvm.
grep llvm configure* doesn't return anything in trunk/, did I checkout[1] the wrong svn?
regards,
Koen
[1] svn://anonsvn.opensource.apple.com/svn/llvm/trunk
Hello
grep llvm configure* doesn't return anything in trunk/, did I
checkout[1] the wrong svn?
No. It's ok 
It's just complicated nature of gcc's build system. In
fact, try "grep llvm gcc/configure"