[LLVMdev] -stats prints nothing, though something is expected

[Rob Stewart]

Hi Philip,

On Wed Feb 18 2015 at 10:11:32 PM Philip Reames <listmail at philipreames.com>
wrote:

>  You are mostly likely using a Release build.  -stats only does anything
> with Assertions enabled.
>

So to use the -stats flag, I must compile LLVM and clang from source, with
--enable-assertions ? That seems quite drastic just to see the printout of
statistics for each pass applied on my IR.

--
Rob


>
> On 02/18/2015 08:58 AM, Rob Stewart wrote:
>
> Given the program:
>
>  int sum(int i,int j)
> { return i+j; }
>
>  int main()
> { sum(3,2); }
>
>  $ clang -S -emit-llvm foo.c
>
>  Now I'd like to print all statistics. Unfortunately, the following
> prints nothing:
>
>  $ opt -S -O3 -stats < foo.ll > /dev/null
>
>  However, running the following prints an IR that is different to the
> contents of foo.ll:
>
>  $ opt -S -O3 foo.ll
>
>  I'm using LLVM 3.5. I'm doing something very obviously wrong. What is it?
>
>  --
> Rob
>
>
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>
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