[Mesa-dev] configure fails to find llvm since recent llvm commit.

[Andy Furniss]

Emil Velikov wrote:
> On 3 July 2017 at 16:31, Andy Furniss <adf.lists at gmail.com> wrote:
>> Rafael Avila de Espindola wrote:
>>>
>>> What check is configure doing?
>>
>>
>> Not sure just a user.
>>
>>> Is the llvm build a clean one? What is the value of LLVM_APPEND_VC_REV?
>>
>>
>> It is a clean build.
>> A reply to the list advised to start using
>>
>> -DLLVM_APPEND_VC_REV=OFF
>>
>> With this it is OK.
>>
> Skimming through the LLVM it's not obvious what is the before/after
> output of `llvm-config --version'. Can anyone share some examples?

On current git head, well it was when I started the build from clean, 
probably not by now :-)

Without -DLLVM_APPEND_VC_REV=OFF the output is

5.0.0git-5a8feb7

With it, it's

5.0.0svn

> It sounds like one decided to omit the "svn" (or equivalent) from the
> string returned, while the DSO still has it.
> 
> Speaking of breakage - 3.9.1 has broken llvm-config
> --libnames/libfiles [1] ... sigh.
> If there's a for 3.9.2 we might want to nominate it ;-)
> 
> -Emil
>