Jenkins build is still unstable: FreeBSD_HEAD #564

[Ngie Cooper (yaneurabeya)]

> On Aug 29, 2016, at 11:04, Ngie Cooper (yaneurabeya) <yaneurabeya at gmail.com> wrote:
> 
>> 
>> On Aug 29, 2016, at 11:02, Ngie Cooper (yaneurabeya) <yaneurabeya at gmail.com> wrote:
>> 
>>> 
>>> On Aug 29, 2016, at 11:00, Bryan Drewery <bdrewery at FreeBSD.org> wrote:
>>> 
>>> On 8/29/2016 10:58 AM, Ngie Cooper (yaneurabeya) wrote:
>>>> (-bdrewery)
>>>> 
>>>>> On Aug 29, 2016, at 10:52, Li-Wen Hsu <lwhsu at FreeBSD.org> wrote:
>>>>> 
>>>>> I guess the quickest way is boot that VM, cd to
>>>>> /usr/tests/lib/atf/libatf-c++ and run `kyua test atf_c++_test`
>>>>> However I am not sure this provides enough information because stuff
>>>>> under /usr/tests/lib/atf/libatf-c++ are all binary files.
>>>>> 
>>>>> FWIW, I would like to know, should these -target, --sysroot and -B flages be
>>>>> given when compiling a normal program in a normal time?  In this test
>>>>> case, kyua just wanted to compile test.cpp which includes sstream, it's
>>>>> not during buildworld/buildkernel time, so files under /usr/obj
>>>>> should not be used.
>>>> 
>>>> I’m actively working on this right now. If I can’t resolve it soon, I’ll file a bug, mark it as an expected failure, and we can work on fixing the issue with a bit more leisure.
>>>> 
>>>> It’s not a cross-compiler problem — something changed recently (likely in clang/libc++) that’s causing this problem, and it might just be an existing bug that was triggered by that change..
>>>> 
>>> 
>>> What changed recently is that buildworld now always uses --sysroot for
>>> Clang, and --sysroot,-isystem,-B,-L for GCC.
>> 
>> Ok. I’m not fully convinced that that’s the problem yet. Will drill down into the issue in the next half hour and will post a bug with my findings.
> 
> Oh wait. Damn… I see the --sysroot line in the compilation output from the test. Crap… that’s not going to work.

	Ok, found a likely culprit: lib/clang/include/clang/Config/config.h. DEFAULT_SYSROOT’s probably being stored in the compiler, somehow…
Cheers,
-Ngie

24 /* Default <path> to all compiler invocations for --sysroot=<path>. */
25 /* #undef DEFAULT_SYSROOT */

$ grep -r DEFAULT_SYSROOT lib/clang/
lib/clang/include/clang/Config/config.h:/* #undef DEFAULT_SYSROOT */
lib/clang/clang.build.mk:               -DDEFAULT_SYSROOT=\"${TOOLS_PREFIX}\”
$ cc -print-search-dirs
programs: =/usr/bin
libraries: =/usr/bin/../lib/clang/3.8.0:/usr/lib
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 842 bytes
Desc: Message signed with OpenPGP using GPGMail
URL: <http://lists.freebsd.org/pipermail/freebsd-testing/attachments/20160829/d90459e2/attachment.sig>