[issue45157] DTrace on RHEL7, generated Include/pydtrace_probes.h fails to build: error: impossible constraint in ‘asm’

[STINNER Victor]

New submission from STINNER Victor <vstinner at python.org>:

I modified RHEL7 configuration to build Python using --with-dtrace:

 argv: [b'./configure', b'--prefix', b'$(PWD)/target', b'--with-pydebug', b'--with-platlibdir=lib64', b'--enable-ipv6', b'--enable-shared', b'--with-computed-gotos=yes', b'--with-dbmliborder=gdbm:ndbm:bdb', b'--enable-loadable-sqlite-extensions', b'--with-dtrace', b'--with-lto', b'--with-ssl-default-suites=openssl', b'--without-static-libpython', b'--with-valgrind']

Problem: the generated Include/pydtrace_probes.h failed to build :-(

---
/usr/bin/dtrace  -o Include/pydtrace_probes.h -h -s Include/pydtrace.d
sed 's/PYTHON_/PyDTrace_/' Include/pydtrace_probes.h > Include/pydtrace_probes.h.tmp
mv Include/pydtrace_probes.h.tmp Include/pydtrace_probes.h
(...)
In file included from ./Include/pydtrace_probes.h:10:0,
                 from ./Include/pydtrace.h:11,
                 from Modules/gcmodule.c:33:
Modules/gcmodule.c: In function ‘gc_collect_main’:
./Include/pydtrace_probes.h:98:1: error: impossible constraint in ‘asm’
 DTRACE_PROBE1 (python, gc__start, arg1)
 ^
./Include/pydtrace_probes.h:109:1: error: impossible constraint in ‘asm’
 DTRACE_PROBE1 (python, gc__done, arg1)
 ^
---

Full logs of AMD64 RHEL7 3.x:
https://buildbot.python.org/all/#/builders/15/builds/761

In the meantime, I disabled --with-dtrace since other buildbot workers failed when dtrace was no installed. See:
https://github.com/python/buildmaster-config/pull/264

Maybe it's a problem on RHEL7. Maybe the problem is that Python is built with LTO?

----------
components: Build
messages: 401526
nosy: cstratak, hroncok, vstinner
priority: normal
severity: normal
status: open
title: DTrace on RHEL7, generated Include/pydtrace_probes.h fails to build: error: impossible constraint in ‘asm’
versions: Python 3.10, Python 3.11

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45157>
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