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Re: [Bug-gsl] SV decomp failure

From: Steve Brosnan
Subject: Re: [Bug-gsl] SV decomp failure
Date: Thu, 25 Oct 2012 19:02:02 -0700

Hi Alexey,

Thanks for your comments.

Actually we have tried to narrow down the optimization problem by progressively 
adding in optimization options, but the results were confusing. See this link:
Please shed some light on this if possible.

Also, by extracting the SV-decomp tests and adding in any files needed to 
compile I did use Xcode to do the test with the Apple LLVM compiler 4.1 (which 
I think uses clang and is now the default Xcode compiler). The tests succeed 
for all optimization options, including -O2. See prior link.

What I don't know is how to tell the gsl build mechanism to use that compiler. 
The Mac compilation tools have gcc being symbolically linked to the 
llvm-gcc-4.2 compiler. But I have not been able to locate the Apple LLVM 
compiler 4.1 in the file system. And I do not know if that compiler uses the 
gcc syntax. Any help is appreciated.

Best regards,

Steve Brosnan

On Oct 25, 2012, at 5:00 PM, "Alexey A. Illarionov" <address@hidden> wrote:

> Hi,
> Steve Brosnan wrote:
> I think so, since problem can be removed with a different optimization
> flag choice. I'm not a Mac user so can't really help, but you can try
> the following
> - Try building GSL with clang, and see if this the problem is gone.
> - In the gcc manual (man gcc) there is a detailed explanation what -Os
> and -O2 mean. You can bisect the difference of these two sets and see
> what option exactly causing this bug.
> Best regards,
> Alexey A. Illarionov

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