gdb/head build, --with-python=<path to working python> FAILs @ "no usable python found " ?

Christian Biesinger cbiesinger@chromium.org
Wed Mar 25 21:57:02 GMT 2020


Yes, Python 3 is known to work, though Python 2.7 is also supported.

Questions:
- What does gdb/config.log say?
- Do you also have the headers and libraries installed?
- Just to confirm,  /usr/local/pyenv/versions/3.8-dev/bin/python3.8 is the
binary and not a directory, right?

Christian

On Wed, Mar 25, 2020 at 4:51 PM PGNet Dev via Gdb <gdb@sourceware.org>
wrote:

> with a local/non-distro python 3.8 installed, via pyenv,
>
>         pyenv global
>                 3.8-dev
>         pyenv which python3.8
>                 /usr/local/pyenv/versions/3.8-dev/bin/python3.8
>         python3.8 -V
>                 Python 3.8.2+
>         python3.8 -c "import sys; print('\n'.join(sys.path))"
>                 /usr/local/pyenv/versions/3.8-dev/lib/python38.zip
>                 /usr/local/pyenv/versions/3.8-dev/lib/python3.8
>                 /usr/local/pyenv/versions/3.8-dev/lib/python3.8/lib-dynload
>
> /usr/local/pyenv/versions/3.8-dev/lib/python3.8/site-packages
>
> building GDB head
>
>         git clone git://sourceware.org/git/binutils-gdb.git
>         cd binutils-gdb
>         git log | head
>                 commit 33aa3c10f663b834c9573ede439b2df3c92f0cfe
>                 Author: Tom Tromey <tom@tromey.com>
>                 Date:   Wed Mar 25 10:26:38 2020 -0600
>
>             Fix error message in compile-object-load.c
>                 ...
>
>         ./configure \
>          --prefix=/usr/local/gdb \
>          --with-python=/usr/local/pyenv/versions/3.8-dev/bin/python3.8
>
>                 ...
>                 configure: creating ./config.status
>                 config.status: creating Makefile
>
> fails @ make, "no usable python found",
>
>         make V=1
>
>                 ...
>                 checking whether to use MPFR... auto
>                 checking for libmpfr... yes
>                 checking how to link with libmpfr... -lmpfr -lgmp
>                 checking whether to use python...
> /usr/local/pyenv/versions/3.8-dev/bin/python3.8
>                 checking for python... no
>                 configure: error: no usable python found at
> /usr/local/pyenv/versions/3.8-dev/bin/python3.8
>                 make[1]: *** [Makefile:11664: configure-gdb] Error 1
>                 make[1]: Leaving directory '/usr/local/src/binutils-gdb'
>                 make: *** [Makefile:854: all] Error 2
>
> In gdb src, the find-python code's a bit challenging to wade through, and
> possibly (?) outdated -- as I still see multiple references to EOL'd python
> 2.7x .
>
>
> IS gdb/head from upstream known to work with python3?
>
> what is the correct config for sufficiently spec'ing a local python
> install?
>


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