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## Problem In multi-character keys, the GIN index creates a CRC Hash of the first 3 bytes of the key. The hash can have the first bit to be set or unset, needing to have a consistent representation of `char` across architectures for consistent results. GIN stores these keys by their hashes which determines the order in which the keys are obtained from the GIN index. By default, chars are signed in x86 and unsigned in arm, leading to inconsistent behavior across different platform architectures. Adding the `-fsigned-char` flag to the GCC compiler forces chars to be treated as signed across platforms, ensuring the ordering in which the keys are obtained consistent. ## Summary of changes Added `-fsigned-char` to the `CFLAGS` to force GCC to use signed chars across platforms. Added a test to check this across platforms. Fixes: https://github.com/neondatabase/cloud/issues/23199
This directory contains files that are needed to build the compute images, or included in the compute images.
compute-node.Dockerfile To build the compute image
vm-image-spec.yaml Instructions for vm-builder, to turn the compute-node image into corresponding vm-compute-node image.
etc/ Configuration files included in /etc in the compute image
patches/ Some extensions need to be patched to work with Neon. This directory contains such patches. They are applied to the extension sources in compute-node.Dockerfile
In addition to these, postgres itself, the neon postgres extension, and compute_ctl are built and copied into the compute image by compute-node.Dockerfile.