Build from source on Apple Silicon M3

Trevor Karn

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May 19, 2024, 10:04:58 PMMay 19

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Hi all,

I am trying to build from source on Apple Silicon M3. As predicted by several sources (below), `gfortran` fails to build on Apple Silicon.

After running `./configure` from SAGE_ROOT, I see the line:

gfortran: no suitable system package; standard, SPKG version 12.2.0 will be installed

Then when I `make`, the build fails with output:

[gfortran-12.2.0] ********************************************************************************

[gfortran-12.2.0] Error building gfortran-12.2.0

[gfortran-12.2.0] ********************************************************************************

[gfortran-12.2.0]

[gfortran-12.2.0] real 0m49.588s

[gfortran-12.2.0] user 2m35.894s

[gfortran-12.2.0] sys 1m22.419s

[gfortran-12.2.0] ************************************************************************

[gfortran-12.2.0] Error building package gfortran-12.2.0

[gfortran-12.2.0] ************************************************************************

The following lines in config.log seems relevant:

## Checking whether SageMath should install SPKG gfortran... ##
configure:18136: checking the version of gfortran
configure:18172: Installing gfortran because gfortran is version 14, which is too recent for this version of Sage
configure:18206: no suitable system package found for SPKG gfortran
configure:18331: checking whether any of gfortran is installed as or will be installed as SPKG
configure:110356: result: gfortran: no suitable system package; standard, SPKG version 12.2.0 will be installed

Since the build wanted to install SPKG version 12.2.0 and thought 14 was "too recent for this version of Sage" I thought I would try `brew install gcc@12`, so that a "suitable system package" would be available. After running `./configure` again I still see

gfortran: no suitable system package; standard, SPKG version 12.2.0 will be installed

Then `make` fails again as predicted.

How can I use either the homebrew gcc@12 or gcc@14 in the build process? Is this done by setting the `FC` environment variable? If so, to what value should I set it? (I tried FC=gcc@12, and still had the same problem.)

Log files are attached.

Thanks!

-Trevor

Sources predicting that `gfortran` installation will fail:

https://github.com/sagemath/sage/wiki/Sage-9.6-Release-Tour

https://ask.sagemath.org/question/63142/cannot-build-sage-from-source-on-m1-mac/

https://github.com/sagemath/sage/?tab=readme-ov-file#macos-preparing-the-platform

config.log

gfortran-12.2.0.log