fix: rename gnu→gnu_omp variant and add stdlib(c) for Intel glibc

[gunnar1987]

Summary

Fixes two reported build issues:

1. GNU/OMP variant resolves to MPI at install time

The gnu variant's build string (gnu_h…) is a prefix of gnu_mpi_h…, so conda install "runner=*=gnu_*" matches both variants. Renamed gnu → gnu_omp to make the globs unambiguous.

2. Intel variant linked to wrong glibc

${{ stdlib('c') }} was only in the GNU branch of the compiler conditional. The Intel build:

• Used system glibc 2.34 (Alma 9 Docker image) instead of the conda-forge sysroot
• Produced a package with no __glibc constraint in the metadata

Fix: moved stdlib('c') outside the conditional and set c_stdlib_version=2.28 for Intel (required by ifx_linux-64).

Changes

• recipe/recipe.yaml — moved stdlib('c') before the compiler conditional; updated variant description
• recipe/conda_build_config.yaml — gnu → gnu_omp; added per-variant c_stdlib_version with zip_keys
• .ci_support/ — updated runner_variant and c_stdlib_version in affected configs

Verification

All three Linux variants rebuilt and tested successfully with rattler-build:

Variant	Build string	__glibc	Tests
gnu_omp	gnu_omp_h6d0f835_1	>=2.17	✔
gnu_mpi	gnu_mpi_h1733be7_1	>=2.17	✔
intel	intel_h6facef5_1	>=2.28	✔

Note: A conda smithy rerender is needed after merge to regenerate CI support file names.

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/recipe.yaml) and found it was in an excellent condition.

[lxknll]

Great, thank you a lot @gunnar1987.

[lxknll]

Great, thanks :) 09.06.2026 12:19:02 Gunnar Schmitz ***@***.***>:

…

***@***.**** commented on this pull request. ---------------------------------------- In recipe/conda_build_config.yaml[#13 (comment)]: > @@ -1,5 +1,5 @@ runner_variant: - - gnu + - gnu_omp - gnu_mpi I renamed it now :) — Reply to this email directly, view it on GitHub[#13?email_source=notifications&email_token=AJFXHPZ3PIFPYDUADTYTTBL467QAXA5CNFSNUABKM5UWIORPF5TWS5BNNB2WEL2QOVWGYUTFOF2WK43UKJSXM2LFO4XTINBVG43DIMJUHEZKM4TFMFZW63VGMFZXG2LHN2SWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#discussion_r3379814290], or unsubscribe[https://github.com/notifications/unsubscribe-auth/AJFXHPZXKEHCHZ3BU6MGC2D467QAXAVCNFSM6AAAAAC2ASADJ6VHI2DSMVQWIX3LMV43YUDVNRWFEZLROVSXG5CSMV3GSZLXHM2DINJXGY2DCNBZGI]. Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS[https://github.com/notifications/mobile/ios/AJFXHP3QSYM4PW7L4Q4BVD3467QAXA5CNFSNUABKM5UWIORPF5TWS5BNNB2WEL2QOVWGYUTFOF2WK43UKJSXM2LFO4XTINBVG43DIMJUHEZKM4TFMFZW63VGMFZXG2LHN2SWK5TFNZ2KUZTPN52GK4S7NFXXG] and Android[https://github.com/notifications/mobile/android/AJFXHP7LO63FKNCPH7QEQHT467QAXA5CNFSNUABKM5UWIORPF5TWS5BNNB2WEL2QOVWGYUTFOF2WK43UKJSXM2LFO4XTINBVG43DIMJUHEZKM4TFMFZW63VGMFZXG2LHN2SWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA]. Download it today! You are receiving this because you were assigned. [Verfolgungsbild][https://github.com/notifications/beacon/AJFXHPZBNTPS4UXC5TLJGL3467QAXBFCNFSM6AAAAAC2ASADJ6WGG33NNVSW45C7OR4XAZNRKB2WY3CSMVYXKZLTORJGK5TJMV32UY3PNVWWK3TUL5UWJTYAAAAACCNSGYKKM4TFMFZW63VGMFZXG2LHNY.gif]