Jenkins build is still unstable: FreeBSD_HEAD #564

Ngie Cooper (yaneurabeya) yaneurabeya at
Mon Aug 29 18:10:24 UTC 2016

> On Aug 29, 2016, at 11:04, Ngie Cooper (yaneurabeya) <yaneurabeya at> wrote:
>> On Aug 29, 2016, at 11:02, Ngie Cooper (yaneurabeya) <yaneurabeya at> wrote:
>>> On Aug 29, 2016, at 11:00, Bryan Drewery <bdrewery at> 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> 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…

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/               -DDEFAULT_SYSROOT=\"${TOOLS_PREFIX}\”
$ cc -print-search-dirs
programs: =/usr/bin
libraries: =/usr/bin/../lib/clang/3.8.0:/usr/lib
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