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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"emscripten cross-compile wasm-ld: error: duplicate symbol `_Py_LibHacl_Hacl_Hash_*`","articleBody":"# Bug report\n\n### Bug description:\n\nFor the emscripten build, during building of the python executable, all the `LIBHACL_*_LIB_SHARED` are used as linker flags, however the `LIBHACL_HMAC_LIB_SHARED` flag contains objects that are already contained in other `LIBHACL_*_LIB_SHARED` flags. This happens, because LIBHACL_MD5_OBJS, LIBHACL_SHA1_OBJS, LIBHACL_SHA2_OBJS, LIBHACL_SHA3_OBJS and LIBHACL_BLAKE2_OBJS are all included in `LIBHACL_HMAC_LIB_SHARED` through `LIBHACL_HMAC_OBJS` via the Makefile.pre.in file.\n\nThe configure script then sets `LIBHACL_HMAC_LDFLAGS=LIBHACL_HMAC_LIB_${LIBHACL_LDEPS_LIBTYPE}` which for a shared emscripten build leads to duplicate dependencies in the final build command which leads to duplicate symbols.\n\nSince I don't know the purpose of the object file references in the `LIBHACL_HMAC_OBJS`, I do not feel comfortable just removing them, even though that change fixes the emscripten build.\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-133043\n* gh-133064\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/Lukasdoe","@type":"Person","name":"Lukasdoe"},"datePublished":"2025-04-27T12:04:55.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":22},"url":"https://github.com/133042/cpython/issues/133042"}