[llvm-bugs] [Bug 36885] New: Clang++ generates unaligned stub symbol holding a pointer

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36885

            Bug ID: 36885
           Summary: Clang++ generates unaligned stub symbol holding a
                    pointer
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rahulchaudhry at chromium.org
                CC: llvm-bugs at lists.llvm.org

Reduced testcase:

---------------- test.cpp ----------------
char str[]= "..";

int foo(void) {
        return 0;
}

class bar {
};

int main(void) {
        try {
                return foo();
        } catch(bar &e) {
                return 1;
        }
}
------------------------------------------

$ clang++ -fPIE -S test.cpp
# relevant sections from test.s:
        .type   str, at object             # @str
        .data
        .globl  str
str:
        .asciz  ".."
        .size   str, 3

        .type   _ZTS3bar, at object        # @_ZTS3bar
        .section        .rodata._ZTS3bar,"aG", at progbits,_ZTS3bar,comdat
        .weak   _ZTS3bar
_ZTS3bar:
        .asciz  "3bar"
        .size   _ZTS3bar, 5

        .type   _ZTI3bar, at object        # @_ZTI3bar
        .section        .data.rel.ro._ZTI3bar,"aGw", at progbits,_ZTI3bar,comdat
        .weak   _ZTI3bar
        .p2align        3
_ZTI3bar:
        .quad   _ZTVN10__cxxabiv117__class_type_infoE+16
        .quad   _ZTS3bar
        .size   _ZTI3bar, 16

        .data
.L_ZTI3bar.DW.stub:
        .quad   _ZTI3bar

This last symbol, '.L_ZTI3bar.DW.stub' ends up directly following 'str' in
.data section (at offset 3).
Note that there is no '.p2align' directive for this symbol.
This is a stub symbol used in <main> for indirect reference to the typeinfo for
class bar.

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