[llvm-bugs] [Bug 35273] New: aligned attribute can not work well when compile with option -fpack-struct

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35273

            Bug ID: 35273
           Summary: aligned attribute can not work well when compile with
                    option -fpack-struct
           Product: clang
           Version: trunk
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: westion717 at gmail.com
                CC: llvm-bugs at lists.llvm.org

#include <stdio.h>
#include <stddef.h>
struct A {
    float a;
    vector short b __attribute__((packed));
    vector signed short c __attribute__((packed));
    vector unsigned char d __attribute__((aligned(16)));
    double e;
};


int main(){
    struct A a;
    printf("offset of a.d = %d\n",offsetof(struct A,d));
    printf("alignment of a.d = %d\n",__alignof__(a.d));
}

/gsa/tlbgsa/projects/x/xlcmpbld/run/clang/main_trunk/linux_leppc/daily/latest/bin/clang
a.c -fpack-struct
./a.out

unexpected output:
offset of a.d = 36
alignment of a.d = 1

gcc a.c -fpack-struct
./a.out

expected output:
offset of a.d = 48
alignment of a.d = 16

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