Python: pkg-config metadata files are missing

[pmenzel]

MarIuX:

$ pkg-config --cflags python3
Package python3 was not found in the pkg-config search path.
Perhaps you should add the directory containing `python3.pc'
to the PKG_CONFIG_PATH environment variable
No package 'python3' found

$ PKG_CONFIG_PATH=/package/pkg/python-3.8.8-0/lib/pkgconfig pkg-config --cflags python3
-I/pkg/python-3.8.8-0/include/python3.8

Debian sid/unstable:

$ pkg-config --cflags python3
-I/usr/include/python3.9 -I/usr/include/x86_64-linux-gnu/python3.9

[pmenzel]

The default environment needs to be adapted somehow, so that Python development files are found out of the box.

$ . /pkg/python-3.8.8-0/profile
$ pkg-config --cflags python3
-I/pkg/python-3.8.8-0/include/python3.8

$ prun python3 pkg-config --cflags python3
-I/pkg/python-3.8.8-0/include/python3.8

[donald]

I'm not not sure, if it wouldn't be a red herring to make that available by default.

If you rely on this pkg-config output during compile time (without explicitly using prun), would the output work on runtime (without using prun) ? Does it find the python runtime with --rpath or something?

What software is asking for these flags? Where would it be installed?

[pmenzel]

Building ONIE fails, as their toolchain (SDK) fails to build (crosstool-ng), as it can’t find the Python development files.

[INFO ]  =================================================================
[INFO ]  Installing cross-gdb
[EXTRA]    Configuring cross gdb
[EXTRA]    Building cross gdb
[ERROR]    configure: error: no usable python found at /usr/bin/python3
[ERROR]    make[2]: *** [Makefile:9199: configure-gdb] Error 1
[ERROR]    make[1]: *** [Makefile:851: all] Error 2
[ERROR]
[ERROR]  >>
[ERROR]  >>  Build failed in step 'Installing cross-gdb'
[ERROR]  >>        called in step '(top-level)'
[ERROR]  >>
[ERROR]  >>  Error happened in: CT_DoExecLog[scripts/functions@376]
[ERROR]  >>        called from: do_gdb_backend[scripts/build/debug/300-gdb.sh@282]
[ERROR]  >>        called from: do_debug_gdb_build[scripts/build/debug/300-gdb.sh@59]
[ERROR]  >>        called from: do_debug[scripts/build/debug.sh@35]
[ERROR]  >>        called from: main[scripts/crosstool-NG.sh@695]
[ERROR]  >>
[ERROR]  >>  For more info on this error, look at the file: 'build.log'
[ERROR]  >>  There is a list of known issues, some with workarounds, in:
[ERROR]  >>      https://crosstool-ng.github.io/docs/known-issues/
[ERROR]  >>
[ERROR]  >>  If you feel this is a bug in crosstool-NG, report it at:
[ERROR]  >>      https://github.com/crosstool-ng/crosstool-ng/issues/
[ERROR]  >>
[ERROR]  >>  Make sure your report includes all the information pertinent to this issue.
[ERROR]  >>  Read the bug reporting guidelines here:
[ERROR]  >>      http://crosstool-ng.github.io/support/
[ERROR]
[ERROR]  (elapsed: 11:33.50)
[11:34] / make: *** [bin/ct-ng:261: build] Error 2

[pmenzel]

The paste is from building crosstool-ng directly with GDB selected.

[pmenzel]

With sourcing the profile.

$ . /pkg/python-3.8.8-0/profile
$ ./bin/ct-ng build
[INFO ]  Performing some trivial sanity checks
[ERROR]  Don't set LD_LIBRARY_PATH. It screws up the build.
[ERROR]   
[ERROR]  >>
[ERROR]  >>  Build failed in step '(top-level)'
[ERROR]  >>
[ERROR]  >>  Error happened in: CT_Abort[scripts/functions@487]
[ERROR]  >>        called from: CT_TestAndAbort[scripts/functions@507]
[ERROR]  >>        called from: main[scripts/crosstool-NG.sh@58]
[ERROR]  >>
[ERROR]  >>  For more info on this error, look at the file: 'build.log'
[ERROR]  >>  There is a list of known issues, some with workarounds, in:
[ERROR]  >>      https://crosstool-ng.github.io/docs/known-issues/
[ERROR]  >>
[ERROR]  >>  If you feel this is a bug in crosstool-NG, report it at:
[ERROR]  >>      https://github.com/crosstool-ng/crosstool-ng/issues/
[ERROR]  >>
[ERROR]  >>  Make sure your report includes all the information pertinent to this issue.
[ERROR]  >>  Read the bug reporting guidelines here:
[ERROR]  >>      http://crosstool-ng.github.io/support/
[ERROR]   
[ERROR]  (elapsed: 26954507:38.31)
[00:00] / make: *** [bin/ct-ng:261: build] Error 1

[pmenzel]

(Updated comment.)

[donald]

"Don't set LD_LIBRARY_PATH. It screws up the build."

Why?

[pmenzel]

No idea why.