AMD64 Fedora Rawhide Clang 3.x: C compiler cannot create executables

[vstinner]

BPO	39398
Nosy	@vstinner

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-01-24.10:27:17.018>
created_at = <Date 2020-01-20.17:14:25.636>
labels = ['tests', '3.9']
title = 'AMD64 Fedora Rawhide Clang 3.x: C compiler cannot create executables'
updated_at = <Date 2020-01-24.10:27:17.017>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-01-24.10:27:17.017>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-01-24.10:27:17.018>
closer = 'vstinner'
components = ['Tests']
creation = <Date 2020-01-20.17:14:25.636>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 39398
keywords = ['buildbot']
message_count = 2.0
messages = ['360324', '360604']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue39398'
versions = ['Python 3.9']

[vstinner]

"AMD64 Fedora Rawhide Clang 3.x" buildbot worker is currently broken:
https://buildbot.python.org/all/#/builders/169/builds/168

clang cannot build (statically linked) binary using UBSan:

$ ./configure --prefix '$(PWD)/target' CC=clang LD=clang CFLAGS=-fsanitize=undefined LDFLAGS=-fsanitize=undefined
...
checking for gcc... clang
checking whether the C compiler works... no
configure: error: in `/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64.clang-ubsan/build':
configure: error: C compiler cannot create executables
See `config.log' for more details

I reproduced the issue on the worker. The issue comes from a version conflict between clang and compiler-rt packages:

compiler-rt-9.0.0-1.fc32.x86_64 uses /usr/lib64/clang/9.0.0/...

vs

clang-9.0.1-2.fc32.x86_64 uses /usr/lib64/clang/9.0.1/...

Charalampos created https://src.fedoraproject.org/rpms/compiler-rt/pull-request/10 to propose to update compiler-rt.

[vstinner]

Charalampos downgraded clang to 10.0.0 to workaround the issue. The buildbot worker compiles the code succesfully again:
https://buildbot.python.org/all/#/builders/169

I close the issue. The issue is now tracked in Fedora Rawhide anyway:
https://src.fedoraproject.org/rpms/compiler-rt/pull-request/10