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J. Nick Koston
eb982e07a7
A failed stderr-sidecar write no longer stamps the cache: the next build re-runs -E and re-derives the preprocessor diagnostic honestly instead of losing it for the life of the build dir. The sidecar unlink joins the best-effort contract. The plain-linker denylist gains the -nodefaultlibs/-nostdlib/-rdynamic family and the -fuse-ld=/--specs= prefixes, with a comment naming it best-effort rather than complete. The damaged-file helper test now lives only in test_helpers.py beside the OSError-branch coverage.
