<html>
    <head>
      <base href="http://llvm.org/bugs/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Second stage bootstrap failure after r207606"
   href="http://llvm.org/bugs/show_bug.cgi?id=19723">19723</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Second stage bootstrap failure after r207606
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>-New Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>ismail@donmez.ws
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>r207606 has broken stage2 bootstrap on openSUSE 13.1 i586/x86-64 with
libcxx/libcxxabi enabled:

[  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.

The difference between non-working and working preprocessed file is:

@@ -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)));
 }

Reverting r207606 fixes the problem.</pre>
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