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Add modern compiler fallbacks to installer - #16

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TiagoBsCastro wants to merge 4 commits into
jmd-dk:masterfrom
TiagoBsCastro:modern-gcc-installer-fallbacks
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TiagoBsCastro wants to merge 4 commits into
jmd-dk:masterfrom
TiagoBsCastro:modern-gcc-installer-fallbacks

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@TiagoBsCastro

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Adds automatic modern-GCC fallbacks for Perl, MPICH, ncurses, SciPy, H5Py, and CLASS; prevents Python user-site installs; and bounds LTO capability probes. Verified with a complete clean installation on GCC 16, local package provenance checks, MPI/HDF5 and CLASS smoke tests, native linkage checks, and a post-install CONCEPT run.

@jmd-dk

jmd-dk commented Sep 21, 2026

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This has now landed!

@jmd-dk jmd-dk closed this Sep 21, 2026
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