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Re: [Xen-devel] tools/tests/x86_emulator causes build failures with older but supported compilers



On 25.11.2019 14:52, Doug Goldstein wrote:
> On 11/25/19 4:44 AM, Jan Beulich wrote:
> 
>> On 23.11.2019 19:00, Doug Goldstein wrote:
>>> Per README, GCC 4.1.2 should lead to a successful default "make install"
>>> per INSTALL. Currently this is failing due to tools/tests/x86_emulator
>>> being in the default path and requiring a compiler with AVX. GCC 4.4.7
>>> on CentOS 6 does not have this leading to a failure to build.
>>>
>>> 1265 make[5]: Entering directory `/builds/xen-project/xen/tools/tests'
>>> 1266 make -C x86_emulator install
>>> 1267 cc1: error: unrecognized command line option "-mavx2"
>>> 1268 cc1: error: unrecognized command line option "-mavx512f"
>>> 1269 cc1: error: unrecognized command line option "-mavx512bw"
>>> 1270 cc1: error: unrecognized command line option "-mavx512dq"
>>> 1271 cc1: error: unrecognized command line option "-mavx512er"
>>> 1272 cc1: error: unrecognized command line option "-mavx512vbmi"
>>> 1273 /tmp/ccMkLpTV.s: Assembler messages:
>>> 1274 /tmp/ccMkLpTV.s:3: Error: junk at end of line, first unrecognized
>>> character is `{'
>> These are errors, yes, but ...
>>
>>> 1275 make[6]: Entering directory
>>> `/builds/xen-project/xen/tools/tests/x86_emulator'
>>> 1276 Makefile:116: Test harness not built, use newer compiler than "gcc"
>>> (version 4.4.7) and an "{evex}" capable assembler
>>> 1277 make[6]: Nothing to be done for `install'.
>> ... there's no build failure here afaics, and this is the intended
>> way of how things are to work.
> 
> The tree is intended to build with a default "make install" with a 
> supported set of tools from README. This is part of the conversations 
> we've had in the past about what should be treated as proper and it was 
> universally agreed.

You still didn't clarify where the build failure is in here. Osstest
for example hits the above errors all the time, without the build
failing. Same for apparently everyone else.

And no, I don't think it was agreed that the _tests_ need to be
buildable with random old tool chains.

Jan

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