llvm dev - Oct 2015 - LNT + test-suite configure script problem

Hi all,

I was wondering whether LNT intentionally uses the host compiler for configuring
the LLVM test-suite. For example, running the following command:

lnt runtest nt --sandbox x86-sandbox --cc /home/vk/build/llvm/debug/bin/clang
--test-suite /home/vk/repos/test-suite

I would expect the configure script (in test-suite) to use the clang from the
specified --cc option. However, from the attached configure.log, it seems that
we use gcc/g++ for configuring the tests.

I discovered this problem (if there's no esoteric option I'm not aware
of) while I was trying to fix a few tests in the LLVM test-suite in order to
make them compatible with Musl. The Musl C library does not support the old
re_comp(), re_exec() functions. The configure script tests for the existence of
these functions. However, by using gcc instead of clang, it tests for them by
using Glibc instead of Musl.

On a related note, I noticed that even if we somehow use the specified clang
compiler for non-native targets, we will not be able to run the configure script
because it doesn't respect the RUNUNDER mechanism when it executes the
intermediate programs it generates.

Thanks,
Vasileios
-------------- next part --------------
A non-text attachment was scrubbed...
Name: configure.log
Type: text/x-log
Size: 12389 bytes
Desc: configure.log
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20151026/37810d2d/attachment.bin>