Fix link warnings related to streambuf stuff

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#74 opened on Sep 30, 2025 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 38/100

Issue type: Bug
Clarity: Needs clarification
Activity status: Stale
Tech stack: cpp, wasm
Domain: build-system

Research direction

Reproduce the wasm build and inspect the link steps for body.cpp.obj and ios.instantiations.cpp.o, focusing on the two streambuf symbols shown in the warnings. Use the kv_store target as a reproduction, then verify that its link completes without the function signature mismatch warnings.

Written by the indexing model from the issue text.

Description

I'm seeing the following in the build logs:

wasm-ld: warning: function signature mismatch: _ZNSt3__215basic_streambufIcNS_11char_traitsIcEEE7seekposENS_4fposI11__mbstate_tEEj
>>> defined as () -> void in ../release/libfastly-thin.a(body.cpp.obj)
>>> defined as (i32, i32, i32, i32) -> void in ../wasm32-wasip1/release/libfastly_sys.a(ios.instantiations.cpp.o)
wasm-ld: warning: function signature mismatch: _ZNSt3__215basic_streambufIcNS_11char_traitsIcEEE7seekoffExNS_8ios_base7seekdirEj
>>> defined as () -> void in ../release/libfastly-thin.a(body.cpp.obj)
>>> defined as (i32, i32, i64, i32, i32) -> void in ../wasm32-wasip1/release/libfastly_sys.a(ios.instantiations.cpp.o)
[ 98%] Built target esi
[ 99%] Building CXX object test/CMakeFiles/kv_store.dir/kv_store.cpp.obj
[100%] Linking CXX executable kv_store
wasm-ld: warning: function signature mismatch: _ZNSt3__215basic_streambufIcNS_11char_traitsIcEEE7seekposENS_4fposI11__mbstate_tEEj
>>> defined as () -> void in ../release/libfastly-thin.a(body.cpp.obj)
>>> defined as (i32, i32, i32, i32) -> void in ../wasm32-wasip1/release/libfastly_sys.a(ios.instantiations.cpp.o)
wasm-ld: warning: function signature mismatch: _ZNSt3__215basic_streambufIcNS_11char_traitsIcEEE7seekoffExNS_8ios_base7seekdirEj
>>> defined as () -> void in ../release/libfastly-thin.a(body.cpp.obj)
>>> defined as (i32, i32, i64, i32, i32) -> void in ../wasm32-wasip1/release/libfastly_sys.a(ios.instantiations.cpp.o)

Dominant language: C++
Stars: 9
Forks: 2
PR merge metrics: No merged PRs in 30d

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