[lldb-dev] Bot failure with new "in tree compiler" changes (r316728) in llvm.org bot

Pavel Labath via lldb-dev lldb-dev at lists.llvm.org
Tue Nov 7 10:28:38 PST 2017

You probably just need to nuke the build folder.

The reason for that is that before the patch the LLDB_TEST_C_COMPILER
variable was used for a different purpose (and usually empty), where
as now it's set by default to the in-tree clang. However, cmake will
not overwrite the cached value by design. (I could have worked around
that in cmake, but I only noticed that issue after landing the

Erasing the build folder should let the new and correct default kick
in. If you run the check-lldb target then it will now use the in-tree
clang instead of the system compiler for using tests.

sorry about the trouble,

On 7 November 2017 at 18:21, Jim Ingham via lldb-dev
<lldb-dev at lists.llvm.org> wrote:
> The lldb_cmake GreenDragon bot is now failing, e.g.:
> http://lab.llvm.org:8080/green/view/LLDB/job/lldb_cmake/1703/consoleFull#589016626e9a0fee5-ebcc-4238-a641-c5aa112c323e
> This looks related to Pavel's change:
>> r316728 | labath | 2017-10-26 19:24:04 -0700 (Thu, 26 Oct 2017) | 18 lines
>> Default to using in-tree clang for building test executables
>> Summary:
>> Using the in-tree clang should be the default test configuration as that
>> is the one compiler that we can be sure everyone has (better
>> reproducibility of test results). Also, it should hopefully reduce the
>> impact of pr35040.
>> This also reduces the number of settings which control the compiler
>> used. LLDB_TEST_C_COMPILER is used for C files and
>> LLDB_TEST_CXX_COMPILER for C++ files. Both of the settings default to
>> the in-tree clang.
>> Reviewers: zturner
>> Subscribers: mgorny, davide, lldb-commits
>> Differential Revision: https://reviews.llvm.org/D39215
> The error is:
> CMake Error at tools/lldb/CMakeLists.txt:78 (message):
>   LLDB test compilers not specified.  Tests will not run
> Does the bot need to be reconfigured for these changes?
> Jim
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