llvm dev - May 2009 - [LLVMdev] Using non-system compiler to build llvm and llvm-gcc front end

On Wed, May 6, 2009 at 12:51 PM, Anton Korobeynikov
<anton at korobeynikov.info> wrote:
> Even if you'll succeed, most probably LLVM will be miscompiled. gcc
> 4.1.2 is known buggy: http://llvm.org/docs/GettingStarted.html#brokengcc
>
Yes, so I have read -- which is why I initially installed gcc-4.2.4.
My original post was looking for help on how to use gcc-4.2.4. Some
suggestions were made, but I was not able to get everything built. It
seems that despite attempting to configure with everything pointing to
gcc-4.2.4 (and not the system gcc 4.1.2), at some point in the build,
something would look for a file or use a file from the system gcc
4.1.2.

I would love to get this built using gcc-4.2.4, but I think I could
use some help. If someone could point me to the relevant config
variables, I might be able to debug this.

Hello, Scott
> Yes, so I have read -- which is why I initially installed gcc-4.2.4.
> My original post was looking for help on how to use gcc-4.2.4. Some
> suggestions were made, but I was not able to get everything built. It
> seems that despite attempting to configure with everything pointing to
> gcc-4.2.4 (and not the system gcc 4.1.2), at some point in the build,
> something would look for a file or use a file from the system gcc
> 4.1.2.
That's correct. Since you have everything linked as shared libraries
system dynamic linker will pick the shared library installed in the
default library location. Most probably you will need to edit
/etc/ld.so.conf and put the gcc 4.2.4 library path there *before*
system compiler one and rerun "ldconfig" (from root)....

-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University

Unfortunately I still have yet to successfully install llvm.

On Wed, May 6, 2009 at 2:32 PM, Anton Korobeynikov
<anton at korobeynikov.info> wrote:
> That's correct. Since you have everything linked as shared libraries
> system dynamic linker will pick the shared library installed in the
> default library location. Most probably you will need to edit
> /etc/ld.so.conf and put the gcc 4.2.4 library path there *before*
> system compiler one and rerun "ldconfig" (from root)....
I added the gcc 4.2.4 library paths to /etc/ld.so.conf, then ran
ldconfig. Then I:

configured llvm:

$ ../llvm/configure --prefix=/pkg/bin/llvm

built llvm:

$ make -j15

configured llvm-gcc:

$ ../llvm-gcc/configure --prefix=/pkg/build/llvm/install
--program-prefix=llvm- --enable-llvm=/pkg/build/llvm/llvm-obj
--enable-languages=c,c++

attempted to build llvm-gcc:

$ make -j15
...
cc1: /pkg/build/llvm/llvm/lib/Analysis/ScalarEvolution.cpp:511:
bool<unnamed>::SCEVComplexityCompare::operator()(const llvm::SCEV*,
const llvm::SCEV*) const: Assertion `0 && "Unknown SCEV
kind!"'
failed.
../../llvm-gcc/libdecnumber/decNumber.c:5591: internal compiler error: Aborted

This is all with llvm and llvm-gcc source from svn. I have tried
gcc-4.2.4 and gcc-4.3.2. ENABLE_OPTIMIZED=1 only seems to work with
gcc-4.3.2.

Here is the error when I try to build llvm with gcc-4.2.4 with
ENABLE_OPTIMIZED=1:

`.gnu.linkonce.t._ZNK4llvm16DAGTypeLegalizer13getTypeActionENS_3MVTE'
referenced in section
`.gnu.linkonce.r._ZNK4llvm16DAGTypeLegalizer13getTypeActionENS_3MVTE'
of
/pkg/build/llvm/llvm-obj/Release/lib/libLLVMSelectionDAG.a(LegalizeVectorTypes.o):
defined in discarded section
`.gnu.linkonce.t._ZNK4llvm16DAGTypeLegalizer13getTypeActionENS_3MVTE'
of
/pkg/build/llvm/llvm-obj/Release/lib/libLLVMSelectionDAG.a(LegalizeVectorTypes.o)
collect2: ld returned 1 exit status
make[2]: *** [/pkg/build/llvm/llvm-obj/Release/lib/libLTO.so] Error 1
make[2]: Leaving directory `/pkg/build/llvm/llvm-obj/tools/lto'

I have also tried installing with the llvm-gcc binary for RHEL4 (even
though I am running Centos 5). However, "make check" returned a bunch
of unexpected failures.

Any suggestions?

Thanks,
Scott