llvm dev - Sep 2013 - [LLVMdev] LLVM ERROR: expected relocatable expression

This example generates the following error:
.Ltmp3:
.Ltmp5:
.Ltmp13:
	.word	(.Ltmp5-.Ltmp3)-.Ltmp13

./llvm-mc ex.s -filetype=obj
LLVM ERROR: expected relocatable expression when using:

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On Fri, Sep 20, 2013 at 2:50 PM, Sid Manning <sidneym at codeaurora.org>
wrote:
>
> This example generates the following error:
> .Ltmp3:
> .Ltmp5:
> .Ltmp13:
>         .word   (.Ltmp5-.Ltmp3)-.Ltmp13
>
> ./llvm-mc ex.s -filetype=obj
> LLVM ERROR: expected relocatable expression when using:
>
>
Umm, isn't this equivalent to the following?  What do you expect LLVM to do
with it?

.Ltmp13:
    .word -.Ltmp13

-Eli
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On 09/20/2013 06:00 PM, Eli Friedman wrote:
> On Fri, Sep 20, 2013 at 2:50 PM, Sid Manning <sidneym at codeaurora.org
> <mailto:sidneym at codeaurora.org>> wrote:
>
>
>     This example generates the following error:
>     .Ltmp3:
>     .Ltmp5:
>     .Ltmp13:
>              .word   (.Ltmp5-.Ltmp3)-.Ltmp13
>
>     ./llvm-mc ex.s -filetype=obj
>     LLVM ERROR: expected relocatable expression when using:
>
>
> Umm, isn't this equivalent to the following?  What do you expect LLVM
to
> do with it?
>
> .Ltmp13:
>      .word -.Ltmp13
I removed the target specific assembly to produce a simple generic 
example.  It was derived from eh_frame code the compiler was emitting.

(.Ltmp5-.Ltmp3)+.Ltmp13 does not generate the error.
>
> -Eli

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