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: [email protected]
ReportedBy: [email protected]
CC: [email protected]
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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