[llvm-dev] HEAD compilation causes gcc internal error

Welson Sun via llvm-dev
Fri, 22 Jul 2016 21:18:31 -0000

After worked around the problem in SimplifyCFG.cpp (calling isCast()
instead of comparing opcode), I hit another gcc crash for
FunctionImport.cpp line 480, which I have no idea what's wrong with the
code. "Luckily", I found gcc4.8.2 and gave it a try, both crashes are
gone.

*New problem though:*
/llvm-clang-trunk/src/tools/clang/lib/CodeGen/CGBuiltin.cpp: In member
function ?llvm::Value*
clang::CodeGen::CodeGenFunction::EmitAMDGPUBuiltinExpr(unsigned int, const
clang::CallExpr*)?:
/llvm-clang-trunk/src/tools/clang/lib/CodeGen/CGBuiltin.cpp:7283:39:
error: *?r600_rsq?
is not a member of ?llvm::Intrinsic?*
     return emitUnaryBuiltin(*this, E, Intrinsic::r600_rsq);
                                       ^
/llvm-clang-trunk/src/tools/clang/lib/CodeGen/CGBuiltin.cpp:7289:39:
error: *?AMDGPU_ldexp?
is not a member of ?llvm::Intrinsic?*
     return emitFPIntBuiltin(*this, E, Intrinsic::AMDGPU_ldexp);
                                       ^

Actually, if I didn't configure to target AMDGPU, why bothering compiling
these code?

On Fri, Jul 22, 2016 at 11:52 AM, Reid Kleckner <rnk at google.com> wrote:

> We can definitely accept a non-invasive patch to work around the issue.
> GCC 4.8 is definitely inside our toolchain support window.
>
> On Fri, Jul 22, 2016 at 2:51 PM, Welson Sun via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Sure this is more likely a gcc bug. However, same toolchain compiled
>> without any problems a week ago. Also, in some organizations, upgrading
gcc
>> is very hard if not impossible.
>>
>> On Fri, Jul 22, 2016 at 11:11 AM, Paulo Matos via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>>>
>>>
>>> On 22/07/16 20:08, Welson Sun via llvm-dev wrote:
>>> > This is gcc4.8.0 compiling HEAD synced on July 22:
>>> >
>>>
>>> My guess is that you're better off posting this to the GCC
mailing list.
>>> It's not LLVM's fault GCC crashed on this. On the other
hand, you might
>>> want to try reproducing this with a more recent compiler before
>>> announcing the issue on the GCC side.
>>>
>>> --
>>> Paulo Matos
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> llvm-dev at lists.llvm.org
>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>>
>>
>>
>>
>> --
>> - Welson
>>
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>>
>


--
- Welson
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