{"id":21220761,"url":"https://github.com/ydrmaster/rrtt","last_synced_at":"2025-03-15T01:11:38.464Z","repository":{"id":65075984,"uuid":"581076462","full_name":"YdrMaster/rrtt","owner":"YdrMaster","description":"rt-thread in rust","archived":false,"fork":false,"pushed_at":"2022-12-28T00:05:28.000Z","size":23,"stargazers_count":1,"open_issues_count":0,"forks_count":0,"subscribers_count":1,"default_branch":"main","last_synced_at":"2025-01-21T17:08:32.168Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":null,"language":"Rust","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/YdrMaster.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null}},"created_at":"2022-12-22T08:00:11.000Z","updated_at":"2022-12-22T17:53:07.000Z","dependencies_parsed_at":"2023-01-31T05:46:02.867Z","dependency_job_id":null,"html_url":"https://github.com/YdrMaster/rrtt","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/YdrMaster%2Frrtt","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/YdrMaster%2Frrtt/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/YdrMaster%2Frrtt/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/YdrMaster%2Frrtt/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/YdrMaster","download_url":"https://codeload.github.com/YdrMaster/rrtt/tar.gz/refs/heads/main","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":243668230,"owners_count":20328042,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2024-11-20T22:13:59.152Z","updated_at":"2025-03-15T01:11:38.443Z","avatar_url":"https://github.com/YdrMaster.png","language":"Rust","funding_links":[],"categories":[],"sub_categories":[],"readme":"# rt-thread in rust\n\n## version 0 (2022-12-22..)\n\n直接翻译 C 版本试试看。\n\n### 2022-12-24\n\nC 里很常见的基于数值的条件编译：\n\n```c\n#if RT_THREAD_PRIORITY_MAX \u003c= 32\n...\n#else\n...\n#endif\n```\n\n在 Rust 里没有对应。\n\n想了一个办法，要求通过环境变量传入这种常量，在 build.rs 里把不同数值范围的环境变量转化为 [`rustc-cfg`](https://doc.rust-lang.org/cargo/reference/build-scripts.html#cargorustc-cfgkeyvalue)。在 build.rs 里这样操作：\n\n```rust\nconst PRIORITY_MAX: \u0026str = \"PRIORITY_MAX\";\nconst PRIORITY_MAX_DEFAULT: usize = 8;\nlet val = match env::var(PRIORITY_MAX) {\n    Ok(s) =\u003e match s.parse::\u003cusize\u003e() {\n        Ok(val) =\u003e val,\n        Err(_) =\u003e panic!(\"failed to parse env {PRIORITY_MAX}={s:?} for not a number.\"),\n    },\n    Err(env::VarError::NotPresent) =\u003e {\n        println!(\"cargo:rustc-env={PRIORITY_MAX}={PRIORITY_MAX_DEFAULT}\");\n        PRIORITY_MAX_DEFAULT\n    }\n    Err(env::VarError::NotUnicode(_)) =\u003e {\n        panic!(\"failed to parse env {PRIORITY_MAX} for not unicode.\");\n    }\n};\nprintln!(\"cargo:rerun-if-env-changed={PRIORITY_MAX}\");\nprintln!(\n    \"cargo:rustc-cfg={}\",\n    if val \u003e 32 {\n        \"large_priority\"\n    } else {\n        \"small_priority\"\n    }\n);\n```\n\n然后可以在代码里用 `#[cfg(large_priority)]` 或 `#[cfg(small_priority)]` 应用条件。\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fydrmaster%2Frrtt","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fydrmaster%2Frrtt","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fydrmaster%2Frrtt/lists"}