problems with sage starting after adding a file

[Martin R]

I guess that this is related to the recent change to meson.  My sage tries to start since several minutes.  I did the following:

* add a file src/sage/combinat/posets/chute_move.py

* start sage

this fails with an error that sage cannot be rebuild

* add `chute_move.py` to the list in src/sage/combinat/posets/meson.build

* export MESONPY_EDITABLE_VERBOSE=1

* start sage

this works, but took about 5 minutes.

I am afraid of having such a situation at a presentation.

Here is the output:

meson-python: building sagemath: /usr/bin/ninja
[0/1] Regenerating build files
The Meson build system
Version: 1.8.3
Source dir: /home/martin/sage
Build dir: /home/martin/sage/build/sage-distro
Build type: native build
Project name: SageMath
Project version: 10.8.beta8
C compiler for the host machine: gcc (gcc 13.3.0 "gcc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0")
C linker for the host machine: gcc ld.bfd 2.42
C++ compiler for the host machine: g++ -std=gnu++11 (gcc 13.3.0 "g++ (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0")
C++ linker for the host machine: g++ -std=gnu++11 ld.bfd 2.42
Cython compiler for the host machine: cython (cython 3.1.3)
Host machine cpu family: x86_64
Host machine cpu: x86_64
Program python found: YES (/home/martin/sage/local/var/lib/sage/venv-python3.12/bin/python3)
Program python (pytest) found: YES (/home/martin/sage/local/var/lib/sage/venv-python3.12/bin/python3) modules: pytest
Dependency numpy found: YES 2.3.2 (cached)
Dependency gmp found: YES 6.3.0 (cached)
Library pari found: YES
Dependency mpfr found: YES 4.2.1 (cached)
Dependency flint found: YES 3.0.1 (cached)
Library flint found: YES
Dependency mkl found: YES 0.3.26 (cached)
Dependency gsl found: YES 2.7.1 (cached)
Dependency gdlib found: YES 2.3.3 (cached)
Library m found: YES
Dependency m4ri found: YES 20250128 (cached)
Dependency m4rie found: YES 20250128 (cached)
Found pkg-config: YES (/usr/bin/pkg-config) 1.8.1
Found CMake: /usr/bin/cmake (3.28.3)
Run-time dependency libmtx found: NO (tried pkgconfig and cmake)
Has header "meataxe.h" : NO (cached)
Dependency libpng found: YES 1.6.43 (cached)
Dependency zlib found: YES 1.3 (cached)
Dependency eclib found: YES 20250627 (cached)
Library ecm found: YES
Dependency gmpxx found: YES 6.3.0 (cached)
Dependency fflas-ffpack found: YES 2.5.0 (cached)
Dependency givaro found: YES 4.2.1 (cached)
Dependency linbox found: YES 1.7.0 (cached)
Library mpc found: YES
Library mpfi found: YES
Dependency libgap found: YES 4.14.0 (cached)
Dependency Singular found: YES 4.4.1 (cached)
Library ntl found: YES
Run-time dependency Boost (missing: graph) found: NO (tried system)
Run-time dependency Boost (missing: graph) found: NO (tried system)
Message: Warning: The specified datadir does not contain the necessary Cremona database. Either specify a different datadir or specify a correct the correct path via the environment variable SAGE_SHARE during runtime.
Program ecl-config found: YES (/usr/bin/ecl-config)
Dependency openmp found: YES 4.5 (cached)
Program gap found: YES (/home/martin/sage/local/bin/gap)
Program ecm found: YES (/usr/bin/ecm)
Program directg found: NO
Program nauty-directg found: YES (/usr/bin/nauty-directg)
Program gentourng found: NO
Program nauty-gentourng found: YES (/usr/bin/nauty-gentourng)
Program geng found: NO
Program nauty-geng found: YES (/usr/bin/nauty-geng)
Program genbg found: NO
Program nauty-genbg found: YES (/usr/bin/nauty-genbg)
Program gentreeg found: NO
Program nauty-gentreeg found: YES (/usr/bin/nauty-gentreeg)
Program genktreeg found: NO
Program nauty-genktreeg found: YES (/usr/bin/nauty-genktreeg)
Program genposetg found: NO
Program nauty-genposetg found: YES (/usr/bin/nauty-genposetg)
Run-time dependency libsirocco found: NO (tried pkgconfig and cmake)
Library sirocco found: NO
Library ecl found: YES
Program ecl found: YES (/usr/bin/ecl)
Program maxima found: YES (/home/martin/sage/local/bin/maxima)
Dependency libbraiding found: YES 1.3.1 (cached)
Dependency bdw-gc-threaded found: YES 8.2.6 (cached)
Run-time dependency libhomfly found: NO (tried pkgconfig and cmake)
Has header "homfly.h" : YES (cached)
Library homfly found: YES
Library coxeter3 found: NO
Dependency lcalc found: YES 2.1.0 (cached)
Run-time dependency symmetrica found: NO (tried pkgconfig and cmake)
Library symmetrica found: YES
Library bliss found: NO
Has header "mcqd.h" : NO (cached)
Run-time dependency libcliquer found: NO (tried pkgconfig and cmake)
Library cliquer found: YES
Dependency libplanarity found: YES 4.0.0.0 (cached)
Has header "treedec/combinations.hpp" : NO (cached)
Library rw found: YES
Library iml found: YES
Library glpk found: YES
Dependency brial found: YES 1.2.14 (cached)
Library brial_groebner found: YES
Configuring kernel.json using configuration
Configuring config.py using configuration
../../src/sage/meson.build:178: WARNING: The variable(s) 'FOURTITWO_CIRCUITS', 'FOURTITWO_GRAVER', 'FOURTITWO_GROEBNER', 'FOURTITWO_HILBERT', 'FOURTITWO_MARKOV', 'FOURTITWO_PPI', 'FOURTITWO_QSOLVE', 'FOURTITWO_RAYS', 'FOURTITWO_ZSOLVE',
'SAGE_MATHJAX_DIR', 'SAGE_ROOT', 'SAGE_VENV', 'configure_input' in the input file 'src/sage/config.py.in' are not present in the given configuration data.
Program python (sphinx) found: YES (/home/martin/sage/local/var/lib/sage/venv-python3.12/bin/python3) modules: sphinx
Build targets in project: 1678

SageMath 10.8.beta8

 User defined options
   Native files   : /home/martin/sage/build/sage-distro/meson-python-native-file.ini
   SAGE_LOCAL     : /home/martin/sage/local
   b_ndebug       : if-release
   b_vscrt        : md
   buildtype      : release
   default_library: static

Found ninja-1.11.1 at /usr/bin/ninja
Cleaning... 0 files.
[1/25] Generating src/sage/ext/interpreters/sage.ext.interpreters with a custom command
Generating interpreters for fast_callable in src/sage/ext/interpreters
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 10.8.beta8, Release Date: 2025-10-27              │
│ Using Python 3.12.3. Type "help()" for help.                       │
└────────────────────────────────────────────────────────────────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Warning: this is a prerelease version, and it may be unstable.     ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
/home/martin/sage/local/var/lib/sage/venv-python3.12/lib/python3.12/site-packages/line_profiler/toml_config.py:111: DeprecationWarning: path is deprecated. Use files() instead. Refer to https://importlib-resources.readthedocs.io/en/late
st/using.html#migrating-from-legacy for migration advice.
 with importlib.resources.path(package + '.rc',
sage:                                                                                

[Dima Pasechnik]

As I suggested earlier, there are ways to make this more consistent, and faster.

The current slowdown is in meson's computing doc dependencies - something that needs to be looked at

by people who understand Sage's legacy non-standard use of sphinx (at least they should step forward and document

all these inventories, how these are built, what depends on what, etc). This should also allow to work on making quick doc updates,

on per document basis.

1) one can disable doc building (simply by commenting out the last line in src/meson.build - although it should be possible to properly 

wrap this into options - meson as well as ./configure's), then the delay

will go away - see https://github.com/sagemath/sage/issues/41160 

2) sage -b and -br should be fixed. https://github.com/sagemath/sage/issues/41161

(I only understand the default, editable, install) Should we/can we do anything for the editable case?

In particular, 1-2) should be enough to alleviate the fears about a sudden slow strartup 

Dima

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[Tobia...@gmx.de]

I started working on the docbuild issue in https://github.com/sagemath/sage/pull/41156. Preparation for this PR is https://github.com/sagemath/sage/pull/41162, which should be ready for review now.