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From: Jan Beich <jbeich@FreeBSD.org>
To: Tijl Coosemans <tijl@FreeBSD.org>
Cc: Alexey Dokuchaev <danfe@FreeBSD.org>, Yuri <yuri@freebsd.org>,
 svn-ports-head@freebsd.org, svn-ports-all@freebsd.org,
 ports-committers@freebsd.org
Subject: Re: svn commit: r457438 - head/devel/ispc
References: <201712280506.vBS56ZSj011894@repo.freebsd.org>
 <20171228071400.GA42910@FreeBSD.org>
 <a5b19d77-4a12-b11f-98aa-ffc94a6037e6@freebsd.org>
 <20171228133631.GB61460@FreeBSD.org>
 <20171228164809.GA33755@FreeBSD.org>
 <20171228175548.1cce8ada@kalimero.tijl.coosemans.org>
Date: Thu, 28 Dec 2017 18:22:58 +0100
In-Reply-To: <20171228175548.1cce8ada@kalimero.tijl.coosemans.org> (Tijl
 Coosemans's message of "Thu, 28 Dec 2017 17:55:48 +0100")
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Tijl Coosemans <tijl@FreeBSD.org> writes:

> On Thu, 28 Dec 2017 16:48:09 +0000 Alexey Dokuchaev <danfe@FreeBSD.org> wrote:
>
>> On Thu, Dec 28, 2017 at 01:36:31PM +0000, Alexey Dokuchaev wrote:
>>> On Thu, Dec 28, 2017 at 01:29:20AM -0800, Yuri wrote:  
>>>> On 12/27/17 23:14, Alexey Dokuchaev wrote:  
>>>>> But just couple of days ago X.org/Mesa had switched to 5.0, and
>>>>> I'm not sure what to do about this yet.  
>>>> 
>>>> Please feel free to further update ISPC's clang dependency if you feel
>>>> this is needed for embree.  
>>> 
>>> Yes, that's probably the most straight way forward.  I'm now (re)building
>>> all the ports involved (that might take some time on my slow hardware) to
>>> verify that CLANG_VERSION=50 does not cause regressions (vs. 40).  
>> 
>> We have a problem building `devel/ispc' againt LLVM 5.0:
>>   ...
>>   /usr/local/llvm50/lib/libLLVMSupport.a(Signals.cpp.o): In function
>> `llvm::sys::PrintStackTrace(llvm::raw_ostream&)':
>>   /work/a/ports/devel/llvm50/work/llvm-5.0.0.src/lib/Support/Signals.cpp:(.text+0x20e0):
>> undefined reference to `backtrace'
>>   clang-5.0: error: linker command failed with exit code 1 (use -v to seeinvocation)
>> 
>> It builds fine against LLVM 4.0.  Anyone got ideas (I'm too drunk to debug
>> this myself now) how do we proceed from here?
>
> "backtrace" is provided by libexecinfo.

Maybe related to https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223191#c3
llvm-config50 is broken in more ways than one. ;(