[LLVMdev] Build failure with libcxx

[İsmail Dönmez]

Filed PR19723


On Mon, May 12, 2014 at 2:06 PM, İsmail Dönmez <ismail at donmez.ws> wrote:

> Not yet, will file one and CC you. Thanks!
>
>
> On Mon, May 12, 2014 at 2:02 PM, Nico Weber <thakis at chromium.org> wrote:
>
>> I'm afk for a few more hours (traveling), will look once I'm at a
>> keyboard. Is there a PR for this?
>>  On May 12, 2014 11:47 AM, "İsmail Dönmez" <ismail at donmez.ws> wrote:
>>
>>> Ok looks like r207606 regressed this. CC'ing Niko.
>>>
>>> Niko, please see the messages below. This is on openSUSE 13.1 both on
>>> i586 and x86-64. Reverting r207606 fixes the second stage bootstrap.
>>>
>>>
>>>
>>> On Sun, May 11, 2014 at 10:19 PM, İsmail Dönmez <ismail at donmez.ws>wrote:
>>>
>>>> I did a diff -u broken.ii working.ii and the difference explains the
>>>> problem:
>>>>
>>>> @@ -36617,7 +36628,7 @@
>>>>      } x;
>>>>    };
>>>>    return Allocator.Allocate(
>>>> -      Size, std::min((size_t)llvm::NextPowerOf2(Size), offsetof(S,
>>>> x)));
>>>> +      Size, std::min((size_t)llvm::NextPowerOf2(Size),
>>>> __builtin_offsetof(S, x)));
>>>>  }
>>>>
>>>>
>>>> Looks like non-working clang is using offsetof where-as the working one
>>>> uses __builtin_offsetof
>>>>
>>>>
>>>>
>>>> On Fri, May 9, 2014 at 11:38 AM, İsmail Dönmez <ismail at donmez.ws>wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> Recently my libcxx enabled llvm/clang builds has started to fail in
>>>>> stage2. I must admit I am stomped because I cannot make sense of the error:
>>>>>
>>>>> [  723s] FAILED: /home/abuild/rpmbuild/BUILD/llvm/stage1/bin/clang++
>>>>> -DLLVMSupport_EXPORTS -DNDEBUG -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS
>>>>> -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -stdlib=libc++ -fPIC
>>>>> -fvisibility-inlines-hidden -Wall -W -Wno-unused-parameter -Wwrite-strings
>>>>> -Wmissing-field-initializers -pedantic -Wno-long-long
>>>>> -Wcovered-switch-default -Wnon-virtual-dtor -std=c++11 -fcolor-diagnostics
>>>>> -ffunction-sections -fdata-sections -O2 -g -DNDEBUG -fPIC -Ilib/Support
>>>>> -I../lib/Support -Iinclude -I../include    -fno-exceptions -MMD -MT
>>>>> lib/Support/CMakeFiles/LLVMSupport.dir/Allocator.cpp.o -MF
>>>>> lib/Support/CMakeFiles/LLVMSupport.dir/Allocator.cpp.o.d -o
>>>>> lib/Support/CMakeFiles/LLVMSupport.dir/Allocator.cpp.o -c
>>>>> ../lib/Support/Allocator.cpp
>>>>> [  723s] In file included from ../lib/Support/Allocator.cpp:14:
>>>>> [  723s] ../include/llvm/Support/Allocator.h:421:65: error: 'S' does
>>>>> not refer to a value
>>>>> [  723s]       Size, std::min((size_t)llvm::NextPowerOf2(Size),
>>>>> offsetof(S, x)));
>>>>> [  723s]
>>>>>   ^
>>>>> [  723s] ../include/llvm/Support/Allocator.h:411:10: note: declared
>>>>> here
>>>>> [  723s]   struct S {
>>>>> [  723s]          ^
>>>>> [  723s] 1 error generated.
>>>>>
>>>>> clang r207403 is OK but trunk fails. Any ideas for debugging this
>>>>> would be appreciated.
>>>>>
>>>>> Thanks!
>>>>>
>>>>>
>>>>
>>>
>
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