- cross-compilation to Windows

build.rs

@@ -1,7 +1,7 @@
 extern crate bindgen;
 
 use std::env;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 
 use std::fmt::Debug;
 
@@ -14,6 +14,37 @@ use regex::Regex;
 use std::collections::HashMap;
 use std::fmt::{Display, Formatter};
 
+fn find_static_lib(dir: &Path, base_name: &str, target_is_windows: bool) -> Option<PathBuf> {
+    if !dir.is_dir() {
+        return None;
+    }
+    let prefixes = ["", "lib"];
+    let extensions = if target_is_windows {
+        &[".lib", ".a"][..]
+    } else {
+        &[".a", ".lib"][..]
+    };
+    for prefix in prefixes {
+        for ext in extensions {
+            let name = format!("{}{}{}", prefix, base_name, ext);
+            let path = dir.join(&name);
+            if path.exists() {
+                return Some(path);
+            }
+        }
+    }
+    None
+}
+
+fn lib_name_from_path(lib_path: &Path) -> Result<String, Box<dyn std::error::Error>> {
+    let file_name = lib_path
+        .file_stem()
+        .ok_or(Error::msg("cannot get file stem"))?
+        .to_str()
+        .ok_or(Error::msg("cannot into string"))?;
+    Ok(file_name.to_string())
+}
+
 struct Error(String);
 
 impl Debug for Error {
@@ -36,15 +67,62 @@ impl Error {
     }
 }
 
+fn fix_xwin_lib_case() -> Result<(), Box<dyn std::error::Error>> {
+    let toolchain_key = format!(
+        "CMAKE_TOOLCHAIN_FILE_{}",
+        env::var("TARGET")?.replace('-', "_")
+    );
+    let toolchain_file = env::var(&toolchain_key)
+        .or_else(|_| env::var("TARGET_CMAKE_TOOLCHAIN_FILE"))
+        .or_else(|_| env::var("CMAKE_TOOLCHAIN_FILE"))?;
+
+    let toolchain_path = PathBuf::from(&toolchain_file);
+    let cargo_xwin_base = toolchain_path
+        .parent()
+        .and_then(|p| p.parent())
+        .and_then(|p| p.parent())
+        .ok_or(Error::msg("cannot determine cargo-xwin base dir"))?;
+
+    let xwin_sdk_lib = cargo_xwin_base.join("xwin/sdk/lib/um/x86_64");
+    if !xwin_sdk_lib.exists() {
+        return Ok(());
+    }
+
+    #[cfg(unix)]
+    {
+        use std::os::unix::fs::symlink;
+        let fixes = [
+            ("Windowscodecs.lib", "WINDOWSCODECS.lib"),
+            ("Windowscodecs.lib", "windowscodecs.lib"),
+        ];
+        for (link_name, target_name) in &fixes {
+            let target = xwin_sdk_lib.join(target_name);
+            let link = xwin_sdk_lib.join(link_name);
+            if target.exists() && !link.exists() {
+                let _ = symlink(&target, &link);
+            }
+        }
+    }
+
+    Ok(())
+}
+
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     if env::var("DOCS_RS").is_err() {
+        let host = env::var("HOST")?;
+        let target = env::var("TARGET")?;
+        let is_cross = host != target;
+        let is_windows = target.contains("windows");
+        let _is_macos = target.contains("apple");
+
         let libczi_dir = PathBuf::from("libczi");
         let libczi_src = libczi_dir.join("Src/libCZI");
         let libcziapi_inc = libczi_dir.join("Src/libCZIAPI/inc");
         let libcziapi_src = libczi_dir.join("Src/libCZIAPI/src");
         let libcziapi_h = libcziapi_inc.join("libCZIApi.h");
 
-        let dst = cmake::Config::new(&libczi_dir)
+        let mut cmake_config = cmake::Config::new(&libczi_dir);
+        cmake_config
             .cxxflag("-fms-extensions")
             .define("LIBCZI_BUILD_UNITTESTS", "OFF")
             .define("LIBCZI_BUILD_CZICMD", "OFF")
@@ -55,16 +133,54 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             .define("LIBCZI_BUILD_PREFER_EXTERNALPACKAGE_LIBCURL", "OFF")
             .define("LIBCZI_BUILD_AZURESDK_BASED_STREAM", "OFF")
             .define("LIBCZI_BUILD_PREFER_EXTERNALPACKAGE_RAPIDJSON", "OFF")
-            .define("LIBCZI_BUILD_LIBCZIAPI", "ON")
-            .build();
+            .define("LIBCZI_BUILD_LIBCZIAPI", "ON");
+
+        if is_cross && is_windows {
+            cmake_config
+                .define("CMAKE_SYSTEM_NAME", "Windows")
+                .define("CRASH_ON_UNALIGNED_ACCESS", "FALSE")
+                .define("ADDITIONAL_LIBS_REQUIRED_FOR_ATOMIC", "");
+
+            let has_toolchain_file = env::var("TARGET_CMAKE_TOOLCHAIN_FILE").is_ok()
+                || env::var(format!(
+                    "CMAKE_TOOLCHAIN_FILE_{}",
+                    target.replace('-', "_")
+                ))
+                .is_ok()
+                || env::var("CMAKE_TOOLCHAIN_FILE").is_ok();
+
+            if !has_toolchain_file {
+                cmake_config
+                    .define("CMAKE_C_COMPILER", "clang")
+                    .define("CMAKE_CXX_COMPILER", "clang++")
+                    .define("CMAKE_RC_COMPILER", "llvm-rc");
+            }
+
+            fix_xwin_lib_case()?;
+        }
+
+        if is_cross && is_windows {
+            cmake_config.build_target("libCZIAPIStatic");
+        }
+
+        let dst = cmake_config.build();
 
         #[cfg(not(feature = "dynamic"))]
         let bindings = {
-            let mut libcziapi_a = dst.join("build/Src/libCZIAPI/liblibCZIAPIStatic.a");
-            if !libcziapi_a.exists() {
-                libcziapi_a = dst.join("build/Src/libCZIAPI/liblibCZIAPIStatic.lib");
-            }
-            bindgen::Builder::default().parse_callbacks(Box::new(DeMangler::new(libcziapi_a)?))
+            let libcziapi_search_dirs = [
+                dst.join("build/Src/libCZIAPI"),
+                dst.join("Src/libCZIAPI"),
+                dst.join("lib"),
+                dst.join("lib64"),
+            ];
+            let libcziapi_static = libcziapi_search_dirs
+                .iter()
+                .find_map(|dir| find_static_lib(dir, "libCZIAPIStatic", is_windows))
+                .ok_or(Error::msg("cannot find libCZIAPIStatic library"))?;
+            bindgen::Builder::default().parse_callbacks(Box::new(DeMangler::new(
+                libcziapi_static,
+                is_cross && is_windows,
+            )?))
         };
 
         #[cfg(feature = "dynamic")]
@@ -101,22 +217,57 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
         #[cfg(not(feature = "dynamic"))]
         {
-            println!(
-                "cargo::rustc-link-search=native={}",
-                dst.join("build/Src/libCZIAPI").display()
-            );
-            println!("cargo::rustc-link-lib=static=libCZIAPIStatic");
+            let libcziapi_dir = dst.join("build/Src/libCZIAPI");
+            let libcziapi_dir2 = dst.join("Src/libCZIAPI");
+            let libczi_dir = dst.join("build/Src/libCZI");
+            let libczi_dir2 = dst.join("Src/libCZI");
+
+            let libcziapi_lib = find_static_lib(&libcziapi_dir, "libCZIAPIStatic", is_windows)
+                .or_else(|| find_static_lib(&libcziapi_dir2, "libCZIAPIStatic", is_windows))
+                .ok_or(Error::msg("cannot find libCZIAPIStatic for linking"))?;
+            let libcziapi_name = lib_name_from_path(&libcziapi_lib)?;
 
-            println!(
-                "cargo::rustc-link-search=native={}",
-                dst.join("build/Src/libCZI").display()
-            );
             let profile = env::var("PROFILE")?;
-            match profile.as_str() {
-                "debug" => println!("cargo::rustc-link-lib=static=libCZIStaticd"),
-                "release" => println!("cargo::rustc-link-lib=static=libCZIStatic"),
+            let libczi_base = match profile.as_str() {
+                "debug" => "libCZIStaticd",
+                "release" => "libCZIStatic",
                 _ => return Err(Error::msg(format!("unsupported profile: {}", profile))),
+            };
+            let libczi_lib = find_static_lib(&libczi_dir, libczi_base, is_windows)
+                .or_else(|| find_static_lib(&libczi_dir2, libczi_base, is_windows))
+                .ok_or(Error::msg(format!(
+                    "cannot find {} for linking",
+                    libczi_base
+                )))?;
+            let libczi_name = lib_name_from_path(&libczi_lib)?;
+
+            if libcziapi_dir.exists() {
+                println!(
+                    "cargo::rustc-link-search=native={}",
+                    libcziapi_dir.display()
+                );
             }
+            if libcziapi_dir2.exists() {
+                println!(
+                    "cargo::rustc-link-search=native={}",
+                    libcziapi_dir2.display()
+                );
+            }
+            println!("cargo::rustc-link-lib=static={}", libcziapi_name);
+
+            if libczi_dir.exists() {
+                println!(
+                    "cargo::rustc-link-search=native={}",
+                    libczi_dir.display()
+                );
+            }
+            if libczi_dir2.exists() {
+                println!(
+                    "cargo::rustc-link-search=native={}",
+                    libczi_dir2.display()
+                );
+            }
+            println!("cargo::rustc-link-lib=static={}", libczi_name);
 
             println!(
                 "cargo::rustc-link-search=native={}",
@@ -126,7 +277,40 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                 "cargo::rustc-link-search=native={}",
                 dst.join("lib64").display()
             );
-            println!("cargo::rustc-link-lib=static=zstd");
+            if is_windows && is_cross {
+                let zstd_dir = dst.join("build/_deps/zstd-build/lib");
+                let zstd_dir2 = dst.join("_deps/zstd-build/lib");
+                if zstd_dir.exists() {
+                    println!(
+                        "cargo::rustc-link-search=native={}",
+                        zstd_dir.display()
+                    );
+                }
+                if zstd_dir2.exists() {
+                    println!(
+                        "cargo::rustc-link-search=native={}",
+                        zstd_dir2.display()
+                    );
+                }
+                let zstd_name = find_static_lib(&zstd_dir, "zstd_static", is_windows)
+                    .or_else(|| find_static_lib(&zstd_dir2, "zstd_static", is_windows))
+                    .map(|p| lib_name_from_path(&p).unwrap_or_else(|_| "zstd_static".to_string()))
+                    .unwrap_or_else(|| "zstd_static".to_string());
+                println!("cargo::rustc-link-lib=static={}", zstd_name);
+            } else {
+                println!("cargo::rustc-link-lib=static=zstd");
+            }
+
+            if is_windows {
+                println!("cargo::rustc-link-lib=kernel32");
+                println!("cargo::rustc-link-lib=advapi32");
+                println!("cargo::rustc-link-lib=bcrypt");
+                println!("cargo::rustc-link-lib=ntdll");
+                println!("cargo::rustc-link-lib=user32");
+                println!("cargo::rustc-link-lib=ole32");
+                println!("cargo::rustc-link-lib=shell32");
+                println!("cargo::rustc-link-lib=Windowscodecs");
+            }
         }
 
         #[cfg(feature = "dynamic")]
@@ -150,12 +334,18 @@ struct DeMangler {
 
 #[cfg(not(feature = "dynamic"))]
 impl DeMangler {
-    fn new(a_file: PathBuf) -> Result<Self, Box<dyn std::error::Error>> {
-        let cmd = std::process::Command::new("nm").arg(&a_file).output()?;
-        let pat = Regex::new(r"^[\da-f]*\s[A-Z]\s(.*_Z(\d+)(libCZI_.*))$")?;
+    fn new(a_file: PathBuf, use_llvm_nm: bool) -> Result<Self, Box<dyn std::error::Error>> {
+        let nm_cmd = if use_llvm_nm { "llvm-nm" } else { "nm" };
+        let cmd = std::process::Command::new(nm_cmd)
+            .arg("--defined-only")
+            .arg(&a_file)
+            .output()?;
+        let itanium_pat = Regex::new(r"^[\da-f]*\s[A-Z]\s(.*_Z(\d+)(libCZI_.*))$")?;
+        let msvc_pat = Regex::new(r"^[\da-f]*\s[TDB]\s(\?(libCZI_\w+)@@.*)$")?;
         let mut map = HashMap::new();
         for line in std::str::from_utf8(&cmd.stdout)?.lines() {
-            if let Some(caps) = pat.captures(line.trim()) {
+            let line = line.trim();
+            if let Some(caps) = itanium_pat.captures(line) {
                 if let (Some(symbol), Some(n), Some(name)) = (caps.get(1), caps.get(2), caps.get(3))
                 {
                     let n: usize = n.as_str().parse()?;
@@ -176,6 +366,24 @@ impl DeMangler {
                         map.insert(demangled, mangled);
                     }
                 }
+            } else if let Some(caps) = msvc_pat.captures(line) {
+                let mangled = caps.get(1).unwrap().as_str().to_string();
+                if let Some(name_match) = caps.get(2) {
+                    let demangled = name_match.as_str().to_string();
+                    if let Some(existing_mangled) = map.get(&demangled) {
+                        if existing_mangled != &mangled {
+                            return Err(Error::msg(format!(
+                                "conflicting mangled symbols for {} in {}: {}, {}",
+                                demangled,
+                                a_file.to_string_lossy(),
+                                existing_mangled,
+                                mangled
+                            )));
+                        }
+                    } else {
+                        map.insert(demangled, mangled);
+                    }
+                }
             }
         }
         Ok(Self { map })