C++ Error building Sage

[Gareth Ma]

Hi all, this is yet another build problem with Sage.

Background: I was helping David with building Sage 10.6 on his M2 Macbook
yesterday using the Meson build method. In particular, I don't have the error
logs right now, but I believe David can reply and attach them later (CC'ed).

1. We started with a completely fresh source tarball download (10.6 stable).

2. Then we installed Miniforge following following
https://doc.sagemath.org/html/en/installation/conda.html.

3. Next, we followed https://doc.sagemath.org/html/en/installation/meson.html
Creating the sage-dev Conda environment worked successfully.

4. We then ran the `pip install --no-build-isolation --editable .`, but it
failed on the file src/sage/graphs/base/boost_interface.cpp

More specifically, it errored on Line 119 (index[boost:source(...)]), IIRC with
this error

> error: non-constant-expression cannot be narrowed from type ... (aka unsigned
long) to ... (aka int) in initializer list [-Wc++11-narrowing]

Is this a known issue? What can cause this? In particular, it compiles on my linux

[Dima Pasechnik]

It's hard to tell, but does your environment use Apple's toolchain, or Conda toolchain.
Could it be that you forgot to activate the Conda environment?

Anyhow, I think 10.6 release is somewhat broken.
Try the latest beta instead.

Duma

[Tobia...@gmx.de]

That's probably due to a recent clang. Should be fixed by https://github.com/sagemath/sage/pull/39526 in the develop branch.

[Gareth Ma]

Re Dima: Thank you for the help! We will try out latest beta and see how it goes.

 

Re Tobias: Thank you! The PR looks very relevant, so we will try out the latest beta again. I don’t remember the clang version, but it was compiled with -std=c++17 in one of the flags.

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[Dima Pasechnik]

For some reason, my proposal to release 10.6.1 to specifically fix this has fallen on deaf ears, I don't know why.

Instead I'm sending dozens of messages related to the 10.6 problem, thank you, the community, for the trust you place in me :-)

To view this discussion visit https://groups.google.com/d/msgid/sage-devel/63517bcf-d72b-483f-9da1-89d782635dde%40Spark.

[David Kohel]

Hi everyone,

Indeed, here is the relevant error line:

../../src/sage/graphs/base/boost_interface.cpp:119:34: error:
non-constant-expression cannot be narrowed from type 'value_type' (aka
'unsigned long') to 'int' in initializer list
[-Wc++11-narrowing-const-reference]

and the full log file is attached.  Any suggestions would be greatly
appreciated.

Best,

David


On 01/05/2025 16:06, Gareth Ma wrote:
> Ce mail provient de l'extérieur, restons vigilants

[Dima Pasechnik]

Hi David,
I already mentioned that 10.6 release is broken.
Please use the latest beta (and perhaps you will need more not yet merged patches)

Dima