Build Everything From Source: A Case Study in Fear
summary
An upgrade from gcc 4.8.5 → gcc 9 exposes intermittent file corruption in a 500,000-line legacy system because a prebuilt custom hdf5 RPM was compiled with incompatible settings. Rebuilding that RPM with gcc 9 and the correct flags stops the corruption. HDF5 offers thread-safe vs single-threaded builds that break C bindings if chosen wrongly, and a hybrid mode crashes. Claim: rebuild all C/C++ dependencies from source with identical compiler and flags to avoid ODR/ABI-variant bugs.
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