[Buildroot] Embedding Python Interpreter with pybind11

[Buildroot] Embedding Python Interpreter with pybind11

[Ryan Smith]

I am attempting to write a program that embeds the Python interpreter
in C++ code using pybind11. When I attempt to compile the package in
Buildroot, I get the following error message.

/src/output-internal/host/include/python3.11/pyport.h:601:2: error:
#error "LONG_BIT definition appears wrong for platform (bad gcc/glibc
config?)."
 #error "LONG_BIT definition appears wrong for platform (bad gcc/glibc
config?)."
  ^~~~~
In file included from
/src/output-internal/host/include/python3.11/Python.h:38:0,
                 from
/src/output-internal/host/arm-buildroot-linux-gnueabihf/sysroot/usr/include/pybind11/detail/common.h:266,
                 from
/src/output-internal/host/arm-buildroot-linux-gnueabihf/sysroot/usr/include/pybind11/attr.h:13,
                 from
/src/output-internal/host/arm-buildroot-linux-gnueabihf/sysroot/usr/include/pybind11/detail/class.h:12,
                 from
/src/output-internal/host/arm-buildroot-linux-gnueabihf/sysroot/usr/include/pybind11/pybind11.h:13,
                 from
/src/output-internal/host/arm-buildroot-linux-gnueabihf/sysroot/usr/include/pybind11/embed.h:12,
                 from
/src/output-internal/build/mmwave-eventd-custom/src/event_detector.h:4,
                 from
/src/output-internal/build/mmwave-eventd-custom/src/event_detector.cpp:4:

Am I missing something, or is this way of using pybind11 in Buildroot
not supported? TIA for any pointers or suggestions.

-- 
Ryan Smith
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Re: [Buildroot] Embedding Python Interpreter with pybind11

[Thomas Petazzoni via buildroot]

Hello Ryan,

On Tue, 22 Aug 2023 22:26:10 -0600
Ryan Smith <ryan.smith@density.io> wrote:

> I am attempting to write a program that embeds the Python interpreter
> in C++ code using pybind11. When I attempt to compile the package in
> Buildroot, I get the following error message.
> 
> /src/output-internal/host/include/python3.11/pyport.h:601:2: error:
> #error "LONG_BIT definition appears wrong for platform (bad gcc/glibc
> config?)."
>  #error "LONG_BIT definition appears wrong for platform (bad gcc/glibc
> config?)."
>   ^~~~~
> In file included from
> /src/output-internal/host/include/python3.11/Python.h:38:0,
>                  from

                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

This is the problem: it's including the host python headers while
building code for the target. That's why it says "LONG_BIT definition
appears wrong for platform".

This is typically addressed by passing the right sysconfigdata, using
the _PYTHON_SYSCONFIGDATA_NAME variable. This is done automatically by
our python-package infrastructure.

Do you have a reproducer for this issue? People on this mailing list
are more likely to provide some help/support if they can reproduce the
issue.

Best regards,

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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