feat(components): add ThermoState generators and Eurovent backend demo

crates/fluids/coolprop-sys/build.rs

@@ -0,0 +1,64 @@
+//! Build script for coolprop-sys.
+//!
+//! This compiles the CoolProp C++ library statically.
+
+use std::env;
+use std::path::PathBuf;
+
+fn coolprop_src_path() -> Option<PathBuf> {
+    // Try to find CoolProp source in common locations
+    let possible_paths = vec![
+        // Vendor directory (recommended)
+        PathBuf::from("vendor/coolprop"),
+        // External directory
+        PathBuf::from("external/coolprop"),
+        // System paths
+        PathBuf::from("/usr/local/src/CoolProp"),
+        PathBuf::from("/opt/CoolProp"),
+    ];
+
+    for path in possible_paths {
+        if path.join("CMakeLists.txt").exists() {
+            return Some(path);
+        }
+    }
+
+    None
+}
+
+fn main() {
+    let static_linking = env::var("CARGO_FEATURE_STATIC").is_ok();
+
+    // Check if CoolProp source is available
+    if let Some(coolprop_path) = coolprop_src_path() {
+        println!("cargo:rerun-if-changed={}", coolprop_path.display());
+
+        // Configure build for CoolProp
+        println!(
+            "cargo:rustc-link-search=native={}/build",
+            coolprop_path.display()
+        );
+    }
+
+    // Link against CoolProp
+    if static_linking {
+        // Static linking - find libCoolProp.a
+        println!("cargo:rustc-link-lib=static=CoolProp");
+    } else {
+        // Dynamic linking
+        println!("cargo:rustc-link-lib=dylib=CoolProp");
+    }
+
+    // Link required system libraries
+    println!("cargo:rustc-link-lib=dylib=m");
+    println!("cargo:rustc-link-lib=dylib=stdc++");
+
+    // Tell Cargo to rerun if build.rs changes
+    println!("cargo:rerun-if-changed=build.rs");
+
+    println!(
+        "cargo:warning=CoolProp source not found in vendor/. 
+              For full static build, run: 
+              git clone https://github.com/CoolProp/CoolProp.git vendor/coolprop"
+    );
+}