STINNER Victor <vstin...@redhat.com> added the comment:
Example of the bug:
---
$ git apply ~/Setup.patch
$ ./configure --with-pydebug --enable-shared
$ make
$ grep _contextvars Makefile
(...)
Modules/_contextvarsmodule.o: $(srcdir)/Modules/_contextvarsmodule.c; $(CC)
$(CCSHARED) $(PY_CFLAGS) $(PY_CPPFLAGS) -c
$(srcdir)/Modules/_contextvarsmodule.c -o Modules/_contextvarsmodule.o
Modules/_contextvars$(EXT_SUFFIX): Modules/_contextvarsmodule.o; $(BLDSHARED)
Modules/_contextvarsmodule.o -o Modules/_contextvars$(EXT_SUFFIX)
$ find -name "_contextvars.*so"
./Modules/_contextvars.cpython-38dm-x86_64-linux-gnu.so
$ ldd $(find -name "_contextvars.*so")
linux-vdso.so.1 (0x00007ffd27973000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fd081433000)
libc.so.6 => /lib64/libc.so.6 (0x00007fd081074000)
/lib64/ld-linux-x86-64.so.2 (0x00007fd081854000)
---
The _contextvars shared library is not linked to libpython. There is not
"-lpythonX.Y" in the Makefile rule.
Now with the patch:
---
$ git clean -fdx
$ git apply ~/Setup.patch
$ ./configure --with-pydebug --enable-shared
$ make
$ grep _contextvars Makefile
(...)
Modules/_contextvarsmodule.o: $(srcdir)/Modules/_contextvarsmodule.c; $(CC)
$(CCSHARED) $(PY_CFLAGS) $(PY_CPPFLAGS) -c
$(srcdir)/Modules/_contextvarsmodule.c -o Modules/_contextvarsmodule.o
Modules/_contextvars$(EXT_SUFFIX): Modules/_contextvarsmodule.o $(LDLIBRARY);
$(BLDSHARED) Modules/_contextvarsmodule.o $(BLDLIBRARY) -o
Modules/_contextvars$(EXT_SUFFIX)
$ find -name "_contextvars.*so"
./Modules/_contextvars.cpython-38dm-x86_64-linux-gnu.so
$ ldd $(find -name "_contextvars.*so")
linux-vdso.so.1 (0x00007ffd1e918000)
libpython3.8dm.so.1.0 => not found
(...)
---
With my patch, _contextvars.cpython-38dm-x86_64-linux-gnu.so is linked to
libpython3.8dm.so.1.0 as expected. The Makefile rule adds $(LDLIBRARY) to the
dependencies of the _contextvars(...).so rule and it adds $(BLDLIBRARY) to the
linker flags of this rule.
----------
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34814>
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