Regarding installation of proposal

I am using 'pip install proposal' to install it. The installation is not showing any error. I have installed proposal-7.6.2. But when I am trying to import it, it is giving error. In jupyter notebook, the kernel is getting dead. In terminal, it's showing 'zsh: segmentation fault python'. Can you please direct me what I am doing wrong in the installation process?

Thanks,
Writasree

Could you please run and show the output of

$ pip uninstall proposal
$ pip install -vv proposal

And also provide details about your operating system and python installation?

This is the output I got-

Using pip 25.2 from /Users/writasree/anaconda3/lib/python3.11/site-packages/pip (python 3.11)
Non-user install because site-packages writeable
Created temporary directory: /private/var/folders/r1/q3xk6pb52z34lk6g_3zqg2000000gn/T/pip-build-tracker-4fbi5wt3
Initialized build tracking at /private/var/folders/r1/q3xk6pb52z34lk6g_3zqg2000000gn/T/pip-build-tracker-4fbi5wt3
Created build tracker: /private/var/folders/r1/q3xk6pb52z34lk6g_3zqg2000000gn/T/pip-build-tracker-4fbi5wt3
Entered build tracker: /private/var/folders/r1/q3xk6pb52z34lk6g_3zqg2000000gn/T/pip-build-tracker-4fbi5wt3
Created temporary directory: /private/var/folders/r1/q3xk6pb52z34lk6g_3zqg2000000gn/T/pip-install-6b4e17id
Created temporary directory: /private/var/folders/r1/q3xk6pb52z34lk6g_3zqg2000000gn/T/pip-ephem-wheel-cache-pm1eor6o
1 location(s) to search for versions of proposal:
* https://pypi.org/simple/proposal/
Fetching project page and analyzing links: https://pypi.org/simple/proposal/
Getting page https://pypi.org/simple/proposal/
Found index url https://pypi.org/simple/
Looking up "https://pypi.org/simple/proposal/" in the cache
Request header has "max_age" as 0, cache bypassed
Starting new HTTPS connection (1): pypi.org:443
https://pypi.org:443 "GET /simple/proposal/ HTTP/1.1" 304 0
Fetched page https://pypi.org/simple/proposal/ as application/vnd.pypi.simple.v1+json
  Found link https://files.pythonhosted.org/packages/ad/ae/4b8f7cb90df04a6e2e605187f1bbd990005bb8dd70b4f925e938b61a35ec/proposal-6.1.0.tar.gz (from https://pypi.org/simple/proposal/), version: 6.1.0
  Found link https://files.pythonhosted.org/packages/6e/c4/eb003e318caab8d8b5d8f9f29e5c28fffbcf0fdf3e401326c39b01b7df7a/proposal-6.1.1.tar.gz (from https://pypi.org/simple/proposal/), version: 6.1.1
  Found link https://files.pythonhosted.org/packages/e7/ed/0ae173fffe5ea30004e185a92d0801d8c413072d03d3f6983658be4f7062/proposal-6.1.2.tar.gz (from https://pypi.org/simple/proposal/), version: 6.1.2
  Found link https://files.pythonhosted.org/packages/f1/1e/4fdc7b0ecbadf441f149962011a0c50f33d7f9645113ad64de91d38dc124/proposal-6.1.3.tar.gz (from https://pypi.org/simple/proposal/), version: 6.1.3
  Found link https://files.pythonhosted.org/packages/bf/f7/77902b3b91ca525c87739c605c9dd8881fb210237b7227d66d12380fcfe2/proposal-6.1.4.tar.gz (from https://pypi.org/simple/proposal/), version: 6.1.4
  Found link https://files.pythonhosted.org/packages/11/db/e93db4653da3f5863288addb512e4a830fe39e6c18b5d673ac2376fe1001/proposal-6.1.5.tar.gz (from https://pypi.org/simple/proposal/), version: 6.1.5
  Found link https://files.pythonhosted.org/packages/64/a6/5e05aa3356e89a1873f52a13505a8cc7b1de822f832047faff31fe3093bc/proposal-6.1.6.tar.gz (from https://pypi.org/simple/proposal/), version: 6.1.6
  Found link https://files.pythonhosted.org/packages/64/f8/9375c8dcaf88b0d22012196a23366d421bf3b24c7f30f01db0df0fa6c07b/proposal-6.1.7.tar.gz (from https://pypi.org/simple/proposal/), version: 6.1.7
  Found link https://files.pythonhosted.org/packages/db/ae/4b498c2d6bb81ff65614d94fbd4ccea307d480d779998cc2fdca29e325fd/proposal-6.1.8.tar.gz (from https://pypi.org/simple/proposal/), version: 6.1.8
  Found link https://files.pythonhosted.org/packages/0c/d8/a16fa724f894adf8280e34db0d1e4a12d64d8f6b8705542c009d09078501/proposal-7.0.1.tar.gz (from https://pypi.org/simple/proposal/), version: 7.0.1
  Found link https://files.pythonhosted.org/packages/29/93/9b14917d517962a9f77790efaf09da8bb61e131b6851be8349d2088564dc/proposal-7.0.3.tar.gz (from https://pypi.org/simple/proposal/), version: 7.0.3
  Found link https://files.pythonhosted.org/packages/a4/fc/02d64d419e1e958aa3d828755e1829ad97b34c8c8c39bd46756c647c208b/proposal-7.0.4.tar.gz (from https://pypi.org/simple/proposal/), version: 7.0.4
  Found link https://files.pythonhosted.org/packages/65/01/408f9b1861a4efe7f133e2697b05f009d25fbf9ce645dbfd5d424ccb0cf8/proposal-7.0.5.tar.gz (from https://pypi.org/simple/proposal/), version: 7.0.5
  Found link https://files.pythonhosted.org/packages/85/88/3749d1d45fb25d73e13f161e58b4cb03d6289cb1dcf362bf4e26bc0ed2c7/proposal-7.0.6.tar.gz (from https://pypi.org/simple/proposal/), version: 7.0.6
  Found link https://files.pythonhosted.org/packages/34/bb/9a23c61db9145c261ee0ea018a5061096188a0498f8dc3d9b06ed556ec63/proposal-7.0.7.tar.gz (from https://pypi.org/simple/proposal/), version: 7.0.7
  Found link https://files.pythonhosted.org/packages/42/e0/769e9e2e6a678aface36b4b84e81d3cd984d5759aa03b0c09e69c14adc59/proposal-7.1.0.tar.gz (from https://pypi.org/simple/proposal/), version: 7.1.0
  Found link https://files.pythonhosted.org/packages/69/55/7f9481a0243b525577daf8e1e120d2811e5cc8ffdbff43816a08c1c476f2/proposal-7.1.1.tar.gz (from https://pypi.org/simple/proposal/), version: 7.1.1
  Found link https://files.pythonhosted.org/packages/ee/8c/6ec809cc8745e5f4a71a1638411bf5566fb5247372ae5ce97c841e9aaddb/proposal-7.2.0.tar.gz (from https://pypi.org/simple/proposal/), version: 7.2.0
  Found link https://files.pythonhosted.org/packages/02/6e/aae132343214977754d9c14580f9bb4a4fcaac1527b9dadc31e9f032d702/proposal-7.2.1.tar.gz (from https://pypi.org/simple/proposal/), version: 7.2.1
  Found link https://files.pythonhosted.org/packages/6c/04/75694b54a7586f3be9d87a7d62e70a01a8252905e149e5684a986d2fc90a/proposal-7.3.0.tar.gz (from https://pypi.org/simple/proposal/), version: 7.3.0
  Found link https://files.pythonhosted.org/packages/5d/3e/16a8514b6482e605704db11d03bfb91868ad90d1cdb0291adc0ac5082179/proposal-7.3.1.tar.gz (from https://pypi.org/simple/proposal/), version: 7.3.1
  Found link https://files.pythonhosted.org/packages/4d/a7/07d6f25f8422dff763a7f92e773fd0c9fb07e36601eb797a6dea8aac7593/proposal-7.4.0.tar.gz (from https://pypi.org/simple/proposal/), version: 7.4.0
  Found link https://files.pythonhosted.org/packages/77/f2/9bb950b4ce35bd006283076fb437e40dbacb22c1abc5c30f28a5bfde3f60/proposal-7.4.1.tar.gz (from https://pypi.org/simple/proposal/), version: 7.4.1
  Found link https://files.pythonhosted.org/packages/62/04/2ccb6c329c842fae33e30ac9213660be069d77c717b0c4bcd7d811e62bf7/proposal-7.4.2.tar.gz (from https://pypi.org/simple/proposal/), version: 7.4.2
  Found link https://files.pythonhosted.org/packages/98/58/290c3e708bf2d6a893ceb6ab49f7d295df3dfb2f64fb5b68e17a4a76ef37/proposal-7.5.0.tar.gz (from https://pypi.org/simple/proposal/), version: 7.5.0
  Found link https://files.pythonhosted.org/packages/00/82/bf8772f15eea535e5c18948080114e5caf77ee6060a84615fc98d16effb5/proposal-7.5.1.tar.gz (from https://pypi.org/simple/proposal/), version: 7.5.1
  Found link https://files.pythonhosted.org/packages/c3/b8/928c6643ce3aaacf0313c7c2fc295c5c8e9ac5728d91d5361b9fbdd2e947/proposal-7.6.0.tar.gz (from https://pypi.org/simple/proposal/), version: 7.6.0
  Found link https://files.pythonhosted.org/packages/65/58/0c91344c254150c0e6d5e479360111f71aa06640b7116d347ab48cd25edc/proposal-7.6.1.tar.gz (from https://pypi.org/simple/proposal/), version: 7.6.1
  Found link https://files.pythonhosted.org/packages/4e/36/6b3ac6de2a4fac5a37d31f43a01fc0cba2e54736f616638f83c21fc94a6a/proposal-7.6.2.tar.gz (from https://pypi.org/simple/proposal/), version: 7.6.2
Skipping link: not a file: https://pypi.org/simple/proposal/
Given no hashes to check 29 links for project 'proposal': discarding no candidates
Using cached wheel link: file:///Users/writasree/Library/Caches/pip/wheels/bd/01/63/2168aaa48c07c747e9c8bc9770f0355e4273fe46a6ea32d93c/proposal-7.6.2-cp311-cp311-macosx_14_0_arm64.whl
Collecting proposal
  Using cached proposal-7.6.2-cp311-cp311-macosx_14_0_arm64.whl
Created temporary directory: /private/var/folders/r1/q3xk6pb52z34lk6g_3zqg2000000gn/T/pip-unpack-4pto_wjw
Installing collected packages: proposal

Successfully installed proposal-7.6.2
Remote version of pip: 25.2
Local version of pip:  25.2
Was pip installed by pip? True
Removed build tracker: '/private/var/folders/r1/q3xk6pb52z34lk6g_3zqg2000000gn/T/pip-build-tracker-4fbi5wt3'

I am using macOS Sonoma 14.1 and python 3.11.5

@WritasreeMaitra

@WritasreeMaitra Sorry, the install didn't show what I wanted to see as it was not rebuilding proposal but used the already locally cached build.

Can you try again with:

$ pip uninstall proposal
$ pip install -vv --no-cache proposal

I see you are on an arm64 based macos using anaconda.

I think the reason you are seeing this crash is that you are using a x86-64 anaconda, which works on its own because of rosetta, but you now are compiling proposal natively, which doesn't work together with the x86-64 python.

To confirm, please show the output of:

$ python3 -c 'import platform; print(platform.machine())'

if it shows x86_64, you have an anaconda using x86-64 running via rosetta, which is incompatible with the newly compiled, native extension module for proposal.

The best solution would be to install a native arm64 python, e.g. via miniforge3:

Latest release: https://github.com/conda-forge/miniforge/releases/tag/25.3.1-0
Native macos arm64 installer: https://github.com/conda-forge/miniforge/releases/download/25.3.1-0/Miniforge3-25.3.1-0-MacOSX-arm64.sh

The output of 'python3 -c 'import platform; print(platform.machine())' is showing arm64 actually.

Ok, then, please, provide the full installation output with the --no-cache option

And, just to be sure, can you also check: python3 -c 'import platform; print(platform.processor()), please?

The output is quite big. I saved it as a pdf and it's 681 pages long. Can you tell me what specifically you are looking for in the output? I can then search that and attach the relevant part of the output.

The output of print(platform.processor()) is arm.

681 pages??? Maybe try with a single -v then. You can upload a txt file here.

pip install -v --no-cache proposal 2>&1 | tee build-log.txt

Ah, because it's "compiling the world" using conan.

build-log.txt

I see nothing suspicious there. However, I ran into a similar issue when now trying to install proposal into a fresh conda environment on linux (see #404).

Could you try if installing from the repo on this branch #405 works for you?

Hi Max,

I tried installing the code from #405. I am still having the same issue. When I am trying to import, it says segmentation fault in the terminal and jupyter notebook terminal is getting dead.

Hi, I had a similar issue on mac and it did not solve my problem. I had a seemingly endless conversion with gemini to try to solve this and eventually made a very ugly hack to get it to work. Below is an AI summary of this (sorry to post AI comments but this was a pain to summarise):

Description
When building PROPOSAL from source inside a Conda/Miniforge environment on macOS (ARM64), running import proposal triggers an immediate segmentation fault during the create_module initialization phase (take_gil crash).

Root Cause
During the CMake configuration phase, the build system discovers the active Python environment's dynamic library (libpython3.x.dylib) and explicitly bakes its absolute path into the final linking command for the python binding module (pyPROPOSAL).

Additionally, on macOS, the module is being compiled using the -dynamiclib flag instead of a loadable runtime -bundle.

When Python attempts to import the resulting .so file, the operating system tries to double-initialize a second, independent instance of the Python runtime/GIL within the hosting process. This triggers a hardware-level memory access violation (EXC_BAD_ACCESS / SIGSEGV at take_gil).

Crash Backtrace (via LLDB)
Plaintext

* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x28)
  * frame #0: 0x00000001018d15e4 libpython3.11.dylib`take_gil + 88
    frame #1: 0x00000001019344dc libpython3.11.dylib`PyGILState_Ensure + 128
    frame #2: 0x0000000100e8b4a8 proposal.cpython-311-darwin.so`___lldb_unnamed_symbol_113468 + 64
    frame #3: 0x0000000100febb2c proposal.cpython-311-darwin.so`PyInit_proposal + 140

The Broken Linker Command (Generated by CMake)
Bash

/usr/bin/c++ -O3 -DNDEBUG -arch arm64 -dynamiclib \
  -Wl,-headerpad_max_install_names -undefined dynamic_lookup -undefined dynamic_lookup -flto \
  -o proposal.cpython-311-darwin.so \
  -install_name @rpath/proposal.cpython-311-darwin.so \
  CMakeFiles/pyPROPOSAL.dir/detail/*.o \
  -Wl,-rpath,/path/to/conda/env/lib \
  ../PROPOSAL/libPROPOSAL.a \
  /path/to/conda/env/lib/libpython3.11.dylib \
  /path/to/conda/env/lib/libCubicInterpolation.a \
  /path/to/conda/env/lib/libboost_filesystem.dylib \
  /path/to/conda/env/lib/libboost_atomic.dylib \
  /path/to/conda/env/lib/libboost_serialization.dylib \
  /path/to/conda/env/lib/libspdlog.1.17.0.dylib \
  /path/to/conda/env/lib/libfmt.12.1.0.dylib

The Working Linker Command (Manual Bypass Fix)
By stripping out the physical path to libpython3.11.dylib, swapping -dynamiclib for -bundle, and relying entirely on -undefined dynamic_lookup, the module loads flawlessly:

Bash

/usr/bin/c++ -O3 -DNDEBUG -arch arm64 -bundle \
  -Wl,-headerpad_max_install_names -undefined dynamic_lookup -flto \
  -o proposal.cpython-311-darwin.so \
  CMakeFiles/pyPROPOSAL.dir/detail/*.o \
  -Wl,-rpath,/path/to/conda/env/lib \
  ../PROPOSAL/libPROPOSAL.a \
  /path/to/conda/env/lib/libCubicInterpolation.a \
  /path/to/conda/env/lib/libboost_filesystem.dylib \
  /path/to/conda/env/lib/libboost_atomic.dylib \
  /path/to/conda/env/lib/libboost_serialization.dylib \
  /path/to/conda/env/lib/libspdlog.1.17.0.dylib \
  /path/to/conda/env/lib/libfmt.12.1.0.dylib

Since this is a python-specific linker issue, I suspect this might be solved by using scikit-build-core instead of the current custom cmake integration in setup.py.

I started this here: #389

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