pyscss2 has no binary wheel and fails w/o pcre dev package

[Radosław Piliszek]

Recently Horizon forked pyscss (thanks, e0one!) and switched to the fork - pyscss2 [1] after pyscss stopped working with new setuptools [2].

--- This applies to *source* builds only. ---

Yet now we get failures due to lack of pcre dev files:

INFO:kolla.common.utils.horizon: In file included from scss/src/_speedups.c:14:
INFO:kolla.common.utils.horizon: scss/src/scanner.h:17:10: fatal error: pcre.h: No such file or directory
INFO:kolla.common.utils.horizon: #include <pcre.h>
INFO:kolla.common.utils.horizon: ^~~~~~~~
INFO:kolla.common.utils.horizon: compilation terminated.
INFO:kolla.common.utils.horizon: ==========================================================================
INFO:kolla.common.utils.horizon: WARNING: The C extension could not be compiled, speedups are not enabled.
INFO:kolla.common.utils.horizon: Failure information, if any, is above.
INFO:kolla.common.utils.horizon: Retrying the build without the C extension now.
INFO:kolla.common.utils.horizon:
INFO:kolla.common.utils.horizon: running bdist_wheel
INFO:kolla.common.utils.horizon: running build
INFO:kolla.common.utils.horizon: running build_py
INFO:kolla.common.utils.horizon: running build_ext
INFO:kolla.common.utils.horizon: building 'scss.grammar._scanner' extension
INFO:kolla.common.utils.horizon: gcc -pthread -Wno-unused-result -Wsign-compare -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DNDEBUG -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv -fPIC -I/var/lib/kolla/venv/include -I/usr/include/python3.6m -c scss/src/_speedups.c -o build/temp.linux-x86_64-3.6/scss/src/_speedups.o
INFO:kolla.common.utils.horizon: In file included from scss/src/_speedups.c:14:
INFO:kolla.common.utils.horizon: scss/src/scanner.h:17:10: fatal error: pcre.h: No such file or directory
INFO:kolla.common.utils.horizon: #include <pcre.h>
INFO:kolla.common.utils.horizon: ^~~~~~~~
INFO:kolla.common.utils.horizon: compilation terminated.

Most notably it tries to build even in non-optimized mode.
Ubuntu is not affected as pcre3-dev is included as some transitive dependency of what we install in openstack-base.
OTOH, at least C8 and Debian are affected and break.

[1] http://lists.openstack.org/pipermail/openstack-discuss/2020-March/013322.html
[2] https://bugs.launchpad.net/kolla/+bug/1866961

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/713589

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/train
Review: https://review.opendev.org/713644

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/713589
Committed: https://git.openstack.org/cgit/openstack/kolla/commit/?id=3e4f3b18dd34543c9bc00a3e07a02a565c8ea536
Submitter: Zuul
Branch: master

commit 3e4f3b18dd34543c9bc00a3e07a02a565c8ea536
Author: Radosław Piliszek <email address hidden>
Date: Wed Mar 18 09:09:58 2020 +0100

    Fix Horizon build after switch to pyscss2 which lacks binary wheel

    It now requires pcre-dev package to finish building.

    Change-Id: I4e003c9aa32579d467c489a53741e20ced2f4b52
    Closes-bug: #1867888

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/713644
Committed: https://git.openstack.org/cgit/openstack/kolla/commit/?id=f7857f26af25543ee8d2e154d45dc159ee8d382e
Submitter: Zuul
Branch: stable/train

commit f7857f26af25543ee8d2e154d45dc159ee8d382e
Author: Radosław Piliszek <email address hidden>
Date: Wed Mar 18 09:09:58 2020 +0100

    Fix Horizon build after switch to pyscss2 which lacks binary wheel

    It now requires pcre-dev package to finish building.

    Change-Id: I4e003c9aa32579d467c489a53741e20ced2f4b52
    Closes-bug: #1867888