Python 3.9.0a4 fails to build when configured with --with-dtrace

[Dormouse759]

BPO	39761
Nosy	@jcea, @encukou, @hroncok, @Dormouse759, @dcarlier-afilias, @devnexen
PRs	bpo-39761: dtrace build fix for Linux and non Linux systems. #18672 bpo-39761: Fix dtrace build with empty $DFLAGS #18766

^{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 2020-03-12.11:29:28.469>
created_at = <Date 2020-02-26.16:56:28.747>
labels = ['build', '3.9']
title = 'Python 3.9.0a4 fails to build when configured with --with-dtrace'
updated_at = <Date 2020-03-12.11:29:28.469>
user = 'https://github.com/Dormouse759'

bugs.python.org fields:

activity = <Date 2020-03-12.11:29:28.469>
actor = 'petr.viktorin'
assignee = 'none'
closed = True
closed_date = <Date 2020-03-12.11:29:28.469>
closer = 'petr.viktorin'
components = ['Build']
creation = <Date 2020-02-26.16:56:28.747>
creator = 'Dormouse759'
dependencies = []
files = []
hgrepos = []
issue_num = 39761
keywords = ['patch']
message_count = 13.0
messages = ['362700', '362701', '362703', '362704', '362712', '362720', '362721', '362723', '362733', '362735', '362737', '362739', '363915']
nosy_count = 6.0
nosy_names = ['jcea', 'petr.viktorin', 'hroncok', 'Dormouse759', 'David Carlier', 'devnexen']
pr_nums = ['18672', '18766']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue39761'
versions = ['Python 3.9']

[Dormouse759]

Steps to reproduce:

$ wget https://www.python.org/ftp/python/3.9.0/Python-3.9.0a4.tar.xz
$ tar xvf Python-3.9.0a4.tar.xz
$ cd Python-3.9.0a4
$ ./configure --with-dtrace
$ make -j12
/usr/bin/ld: libpython3.9.a(ceval.o): in function `_PyEval_EvalFrameDefault':
/home/mplch/Work/fedpkg/Python-3.9.0a4/Python/ceval.c:1117: undefined reference to `python_function__entry_semaphore'
/usr/bin/ld: /home/mplch/Work/fedpkg/Python-3.9.0a4/Python/ceval.c:1254: undefined reference to `python_line_semaphore'
/usr/bin/ld: /home/mplch/Work/fedpkg/Python-3.9.0a4/Python/ceval.c:3697: undefined reference to `python_function__return_semaphore'
/usr/bin/ld: /home/mplch/Work/fedpkg/Python-3.9.0a4/Python/ceval.c:1445: undefined reference to `python_line_semaphore'

...

/usr/bin/ld: libpython3.9.a(gcmodule.o):(.note.stapsdt+0x70): undefined reference to `python_gc__done_semaphore'
collect2: error: ld returned 1 exit status
make: *** [Makefile:709: Programs/_testembed] Error 1

Additional info:
$ gcc --version
gcc (GCC) 9.2.1 20190827 (Red Hat 9.2.1-1)
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[hroncok]

I can reproduce this from git and will try to bisect the introducer.

[hroncok]

aabdeb7 is the first new commit
commit aabdeb7
Author: David Carlier <dcarlier@afilias.info>
Date: Tue Jan 28 12:53:32 2020 +0000

bpo-38960: DTrace build fix for FreeBSD. (GH-17451)

DTrace build fix for FreeBSD.

- allowing passing an extra flag as it need to define the arch size.
- casting some probe's arguments.

.../next/Core and Builtins/2019-12-03-16-41-22.bpo-38960.kvoFM0.rst | 1 +
Python/ceval.c | 6 +++---
Python/import.c | 4 ++--
Python/sysmodule.c | 2 +-
configure | 3 +--
configure.ac | 3 +--
6 files changed, 9 insertions(+), 10 deletions(-)
create mode 100644 Misc/NEWS.d/next/Core and Builtins/2019-12-03-16-41-22.bpo-38960.kvoFM0.rst

[dcarlier-afilias]

Sorry for the inconveniences. I can reproduce on FreeBSD too if I do not set the DFLAGS env var (because FreeBSD needs architecture bits in addition). What happens when make distclean && export DFLAGS="" && ./configure --with-dtrace ?

[hroncok]

export DFLAGS="" does not seem to workaround this.

$ make distclean && export DFLAGS="" && ./configure --with-dtrace && make
...
undefined reference to `python_line_semaphore'
...

[dcarlier-afilias]

What about DFFLAGS=" " ?

[hroncok]

Nope.

[dcarlier-afilias]

Weird I just tried on ubuntu/systemtap...

[hroncok]

$ make clean && make distclean
$ git clean -x
$ export DFLAGS=""
$ export DFFLAGS=""
$ ./configure --with-dtrace && make
...
undefined reference to `python_audit_semaphore'
...

[dcarlier-afilias]

ah sorry I meant DFLAGS=" " (with a space).

[dcarlier-afilias]

If it works for you, it might mean making a specific case for Linux systems in configure.ac as a proper fix.

[hroncok]

Oh, my bad.

DFLAGS=" "

^ that indeed works.

[encukou]

New changeset 3c97e1e by Petr Viktorin in branch 'master':
bpo-39761: Fix dtrace build with empty $DFLAGS (GH-18766)
3c97e1e