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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"blake2module.c needs to be compiled with libhacl SIMD flags","articleBody":"# Bug report\n\n### Bug description:\n\n`blake2module.c` may include `_hacl/Hacl_Hash_Blake2b_Simd256.h` and/or `_hacl/Hacl_Hash_Blake2s_Simd128.h`, and thus needs to compile with `LIBHACL_SIMD128_FLAGS` and/or `LIBHACL_SIMD256_FLAGS`, or you get an error like this if the compiler doesn't enable those SIMD features by default:\n```\nIn file included from ./Modules/blake2module.c:139:\nIn file included from ./Modules/_hacl/Hacl_Hash_Blake2b_Simd256.h:42:\nIn file included from ./Modules/_hacl/libintvector.h:28:\n/Library/Developer/CommandLineTools/usr/bin/../lib/clang/7.0.2/include/smmintrin.h:28:2: error: \"SSE4.1 instruction set not enabled\"\n```\nI would create a PR but unfortunately I can't figure out where this needs to be added.\n\n### CPython versions tested on:\n\n3.14\n\n### Operating systems tested on:\n\nmacOS\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-130332\n* gh-130447\n* gh-130483\n* gh-130960\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/jmroot","@type":"Person","name":"jmroot"},"datePublished":"2025-02-17T02:11:19.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":23},"url":"https://github.com/130213/cpython/issues/130213"}