[LLVMbugs] [Bug 4723] New: invalid relocation for PIC emitted in libstdc++ build

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4723

           Summary: invalid relocation for PIC emitted in libstdc++ build
           Product: tools
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: llvm-g++
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: gohman at apple.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=3313)
 --> (http://llvm.org/bugs/attachment.cgi?id=3313)
preprocessed C++ source

The llvm-gcc build fails on x86_64-unknown-linux-gnu with this message:

/usr/bin/ld: .libs/bitmap_allocator.o: relocation R_X86_64_PC32 against symbol
`__gxx_personality_v0' can not be used when making a shared object; recompile
with -fPIC

It appears that llvm-g++ is emitting a non-PIC relocation in PIC mode,
in the .eh_frame section.  Attached is the preprocessed source for 
bitmap_allocator.o. Compiling it with both g++-4.2 and llvm-g++ shows
the difference:

g++-4.2 -fpic -c bitmap_allocator.i && readelf -r bitmap_allocator.o |grep
personality
Relocation section '.rela.data.DW.ref.__gxx_personality_v0' at offset 0x1b998
contains 1 entries:
000000000000  018500000001 R_X86_64_64       0000000000000000
__gxx_personality_v0 + 0

llvm-g++ -fpic -c bitmap_allocator.i && readelf -r bitmap_allocator.o |grep
personality
00000000002b  01b800000002 R_X86_64_PC32     0000000000000000
__gxx_personality_v0 + 0


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