[LLVMdev] Build failure with libcxx

[Nico Weber]

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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