[LLVMbugs] [Bug 14291] New: Issues found by building clang with -fsanitize=undefined

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14291

             Bug #: 14291
           Summary: Issues found by building clang with
                    -fsanitize=undefined
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: markus at trippelsdorf.de
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Building clang with:
CC="clang
-fsanitize=alignment,divide-by-zero,float-cast-overflow,null,object-size,return,shift,signed-integer-overflow,unreachable,vla-bound
-w" CXX="clang++
-fsanitize=alignment,divide-by-zero,float-cast-overflow,null,object-size,return,shift,signed-integer-overflow,unreachable,vla-bound
-w" ../llvm/llvm/configure --enable-keep-symbols --enable-optimized
--enable-targets=host
--with-binutils-include=/usr/lib/binutils/x86_64-pc-linux-gnu/git/include
--with-cxx-include-arch=/x86_64-pc-linux-gnu --disable-assertions
--with-extra-options="-march=native"
--with-extra-ld-options="-Wl,-O1,--hash-style=gnu,--as-needed,--gc-sections,--icf=all,--icf-iterations=3"
make

leads to the following two issues:

llvm/lib/Analysis/ValueTracking.cpp:436:19: fatal error: member call on null
pointer of type 'llvm::DataLayout' 

llvm/tools/clang/lib/Sema/../../include/clang/AST/TypeLoc.h:1525:27: fatal
error: member access within misaligned address 0x4c149b4 for type
'clang::Elabor
atedLocInfo', which requires 8 byte alignment

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