[LLVMdev] Build failure with libcxx

[İsmail Dönmez]

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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