[LLVMbugs] [Bug 9177] New: clang gets confused with alias and asm labels

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9177

           Summary: clang gets confused with alias and asm labels
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu


Given

-------------------
int __attribute__((visibility("hidden"))) foo (void);
extern __typeof (foo) foo __asm__ ("INT_foo")
__attribute__((__visibility__("hidden"))) ;
int foo (void) {
}
extern __typeof (foo) EXT_foo __asm__("foo")
__attribute__((__alias__("INT_foo")));
--------------------

Clang will produce

---------------------------
@"\01foo" = alias i32 ()* @INT_foo
define hidden i32 @"\01INT_foo"() nounwind {
entry:
  %retval = alloca i32, align 4
  %0 = load i32* %retval
  ret i32 %0
}
declare i32 @INT_foo()
--------------------------

Note how we have a declaration for INT_foo and a definition for "\01INT_foo".
This gets resolved by LLVM's codegen, but causes problems to LTO because the
alias foo is pointing to a declaration.

Producing
---------------------------
@"\01foo" = alias i32 ()* @"\01INT_foo"
define hidden i32 @"\01INT_foo"() nounwind {
entry:
  %retval = alloca i32, align 4
  %0 = load i32* %retval
  ret i32 %0
}
--------------------------
would fix the problem.

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