MSVC build is broken (undeclared `DTLS_DEBUG_BUF_SIZE`)
维护者通常 2 天内回复
评估
- 难度
- 2/5
- 预计耗时
- 1-3 小时
- 新手友好度
- 25/100
- Issue 类型
- 缺陷
- 描述清晰度
- 描述清楚
- 活跃度
- 停滞
- 技术栈
- c, cmake
- 领域
- build-system
调研方向
Start with dtls_debug.c, comparing the preprocessor condition around the DTLS_DEBUG_BUF_SIZE declaration (around lines 250–279) with its use around lines 397–403. Reproduce with the CMake configure and build commands on Windows with MSVC; the issue is done when that build succeeds. Pull request #296 is already open for this issue.
由索引模型根据 Issue 内容生成。
描述
The MSVC-Build is currently (develop: https://github.com/eclipse-tinydtls/tinydtls/commit/d9738c31c374d879140f408ac81f2752eacaed4d) broken. It looks like a 4-year-old regression (see below).
Observation
Building with basic cmake commands under Win11 with VS2026:
$ rm -rf build/; cmake -B build && cmake --build build
-- Building for: Visual Studio 18 2026
-- Selecting Windows SDK version 10.0.26100.0 to target Windows 10.0.22631.
-- The C compiler identification is MSVC 19.51.36256.0
-- The CXX compiler identification is MSVC 19.51.36256.0
[...]
D:\github\eclipse-tinydtls\tinydtls\dtls_debug.c(402,16): error C2065: 'DTLS_DEBUG_BUF_SIZE': undeclared identifier [D:\github\eclipse-tinydtls\tinydtls\build\tinydtls.vcxproj]
D:\github\eclipse-tinydtls\tinydtls\dtls_debug.c(402,16): error C2057: expected constant expression [D:\github\eclipse-tinydtls\tinydtls\build\tinydtls.vcxproj]
D:\github\eclipse-tinydtls\tinydtls\dtls_debug.c(402,16): error C2466: cannot allocate an array of constant size 0 [D:\github\eclipse-tinydtls\tinydtls\build\tinydtls.vcxproj]
D:\github\eclipse-tinydtls\tinydtls\dtls_debug.c(402,8): error C2133: 'message': unknown size [D:\github\eclipse-tinydtls\tinydtls\build\tinydtls.vcxproj]
Build fails because of error C2065: 'DTLS_DEBUG_BUF_SIZE': undeclared identifier.
Analysis
The indentifier DTLS_DEBUG_BUF_SIZE is undeclared in this constellation because
-
It gets declared inside a preprocessor condition
#if !defined(WITH_CONTIKI) && !defined(_MSC_VER):
https://github.com/eclipse-tinydtls/tinydtls/blob/d9738c31c374d879140f408ac81f2752eacaed4d/dtls_debug.c#L250-L279 -
It gets used inside a different preprocessor condition
#ifndef WITH_CONTIKI
https://github.com/eclipse-tinydtls/tinydtls/blob/d9738c31c374d879140f408ac81f2752eacaed4d/dtls_debug.c#L397-L403
This means that the identifier is undeclared when building without contiki with the MSVC compiler.
It has probably been this way since the introduction of DTLS_DEBUG_BUF_SIZE in 2022: https://github.com/eclipse-tinydtls/tinydtls/commit/70a2b397af0b69488380689087fbc0562cebd497 (unconfirmed).
Conclusion
I'm not sure what the correct fix would be, but changing the latter condition to equal the former at least builds without errors again.
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eclipse-tinydtls/tinydtls 的其他 Issue
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ECDHE_ECDSA ClientKeyExchange rejected as too short when DTLS_PSK_MAX_CLIENT_IDENTITY_LEN > 64可能已有人在做 关联的 PR 仍在进行中或已合并。 未关闭bug good first issue please retest
难度 2/5 1-3 小时 新手友好度 76/100
eclipse-tinydtls/tinydtls#298 · 2 条评论 ·
维护者通常 2 天内回复
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`dtls_get_cookie`: dereference before the length check (currently masked by `dtls_create_cookie`)未关闭
难度 2/5 1-3 小时 新手友好度 68/100
eclipse-tinydtls/tinydtls#279 · 2 条评论 · 1 个 reaction ·
维护者通常 2 天内回复
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难度 2/5 1-3 小时 新手友好度 57/100
eclipse-tinydtls/tinydtls#278 · 3 条评论 · 1 个 reaction ·
维护者通常 2 天内回复
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难度 4/5 3-5 天 新手友好度 45/100
eclipse-tinydtls/tinydtls#274 · 2 条评论 ·
维护者通常 2 天内回复
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bug
难度 4/5 3-5 天 新手友好度 48/100
eclipse-tinydtls/tinydtls#273 · 2 条评论 ·
维护者通常 2 天内回复
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