[LLVMbugs] [Bug 19723] New: Second stage bootstrap failure after r207606

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19723

            Bug ID: 19723
           Summary: Second stage bootstrap failure after r207606
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ismail at donmez.ws
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

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.

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