From 2ce3b1162892f39963481b0ea196339aa59ea8ab Mon Sep 17 00:00:00 2001
From: grabbit <imgaojp@gmail.com>
Date: Sat, 5 Apr 2025 15:10:21 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20gpio=20feature=E6=A0=B9=E6=8D=AE?=
 =?UTF-8?q?=E6=93=8D=E4=BD=9C=E7=B3=BB=E7=BB=9F=E8=87=AA=E5=8A=A8=E5=88=A4?=
 =?UTF-8?q?=E6=96=AD?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 Cargo.toml |  8 ++++++++
 build.rs   | 18 ++++++++++++------
 src/lib.rs |  7 +++----
 3 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 43c29f7..87f1f7a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,15 @@ authors = ["Meteor Detection Team"]
 description = "A Raspberry Pi based meteor detection system"
 
 [features]
+# 默认features，在Linux上自动包含gpio
 default = []
+
+# 如果在Linux上运行，则默认启用GPIO support
+# 这确保rppal和embedded-hal依赖会被编译进来
+[target.'cfg(target_os = "linux")'.features]
+default = ["gpio"]
+
+# 定义常规的features (全平台通用)
 gpio = ["rppal", "embedded-hal"]  # Feature to enable GPIO functionality
 opencv-4-11-plus = []  # For OpenCV 4.11 and newer versions
 
diff --git a/build.rs b/build.rs
index 1a45be8..34d4e5c 100644
--- a/build.rs
+++ b/build.rs
@@ -7,12 +7,19 @@ fn main() {
     // 检测当前是否在树莓派或其他支持GPIO的Linux平台上
     let supports_gpio = detect_gpio_support();
     
-    // 自动启用GPIO功能（如果支持）
+    // 设置环境变量，告诉lib.rs是否有实际的GPIO支持
+    // 注意：这只影响PLATFORM_SUPPORTS_GPIO的值，不影响依赖的启用
     if supports_gpio {
-        println!("cargo:rustc-cfg=feature=\"gpio\"");
-        println!("cargo:warning=GPIO support detected, enabling gpio feature");
+        // 设置编译器配置，lib.rs会使用它
+        println!("cargo:rustc-env=HAS_GPIO_SUPPORT=true");
+        println!("cargo:warning=GPIO support detected, PLATFORM_SUPPORTS_GPIO will be true");
+    } else if cfg!(target_os = "linux") {
+        // 特殊情况：Linux但没有GPIO支持
+        println!("cargo:rustc-env=HAS_GPIO_SUPPORT=false");
+        println!("cargo:warning=Running on Linux but no GPIO support detected, PLATFORM_SUPPORTS_GPIO will be false");
     } else {
-        println!("cargo:warning=No GPIO support detected, gpio feature NOT enabled");
+        println!("cargo:rustc-env=HAS_GPIO_SUPPORT=false");
+        println!("cargo:warning=No GPIO support detected, PLATFORM_SUPPORTS_GPIO will be false");
     }
     
     // 通过包含的 OpenCV 库检测版本
@@ -101,8 +108,7 @@ fn detect_gpio_support() -> bool {
         }
     }
     
-    // 如果还没确定，检查是否在CARGO_FEATURE_GPIO环境变量中强制启用
-    // 这允许用户手动启用GPIO功能（覆盖自动检测）
+    // 如果还没确定，检查是否在环境变量中强制启用
     if env::var("CARGO_FEATURE_GPIO").is_ok() {
         return true;
     }
diff --git a/src/lib.rs b/src/lib.rs
index c81427f..0251ecc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,8 +1,7 @@
-// 这里的常量将在编译时由build.rs设置
-// 通过rustc-cfg设置的cfg特性可以在代码中使用
-// 将PLATFORM_SUPPORTS_GPIO基于实际检测到的GPIO支持来设置
+// 使用由build.rs设置的环境变量来确定是否有GPIO支持
+// 这让代码可以区分"有依赖但没有实际GPIO"和"有依赖且有实际GPIO"的情况
 #[cfg(feature = "gpio")]
-pub const PLATFORM_SUPPORTS_GPIO: bool = true;
+pub const PLATFORM_SUPPORTS_GPIO: bool = option_env!("HAS_GPIO_SUPPORT").map_or(false, |v| v == "true");
 
 #[cfg(not(feature = "gpio"))]
 pub const PLATFORM_SUPPORTS_GPIO: bool = false;