[LLVMbugs] [Bug 5060] New: clang ignores attribute aligned on some variables

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=5060

           Summary: clang ignores attribute aligned on some variables
           Product: clang
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: gohman at apple.com
                CC: llvmbugs at cs.uiuc.edu


For this C source:

char *foo(void) {
  static char p __attribute__((aligned(32)));
  return &p;
}

void frob(char *);
void bar(long n) {
  char p[n] __attribute__((aligned(32)));
  frob(p);
}


clang emits LLVM IR containing these two constructs, missing the alignment
information.

@foo.p = internal global i8 0                     ; <i8*> [#uses=1]

  %vla = alloca i8, i32 %n3, align 1              ; <i8*> [#uses=1]


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