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fn main() {
println!("cargo:rerun-if-changed=src/lib.h");
println!("cargo:rerun-if-changed=src/lib.cpp");
println!("cargo:rerun-if-changed=src/lib.rs");
let target_env = std::env::var("CARGO_CFG_TARGET_ENV").unwrap_or_default();
let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap_or_default();
let mut cc_build = cxx_build::bridge("src/lib.rs");
cc_build.file("src/lib.cpp");
// MSVC uses /std:c++17; GCC/Clang use -std=c++17
if target_env == "msvc" {
cc_build.flag("/std:c++17");
} else {
cc_build.flag("-std=c++17");
}
cc_build.define("GLOG_USE_GLOG_EXPORT", None);
// On Windows, glog's abbreviated severity macros (ERROR, WARNING, INFO, …)
// conflict with macros defined in <windows.h>. This define tells glog not
// to create those short aliases, which is all we need to break the conflict.
if target_os == "windows" {
cc_build.define("GLOG_NO_ABBREVIATED_SEVERITIES", None);
}
#[cfg(feature = "source")]
{
cc_build.includes(std::env::split_paths(
&std::env::var("DEP_CERES_INCLUDE").unwrap(),
));
println!("cargo:rustc-link-lib=static=glog");
println!("cargo:rustc-link-lib=static=ceres");
}
#[cfg(not(feature = "source"))]
{
if target_os == "windows" {
// On Windows, pkg-config is not standard. Locate Ceres via the
// vcpkg crate (reads VCPKG_ROOT + VCPKGRS_TRIPLET) or fall back to
// explicit environment variables when vcpkg is unavailable:
// CERES_INCLUDE_DIR — Ceres/Eigen headers
// EIGEN3_INCLUDE_DIR — Eigen headers (if separate)
// CERES_LIB_DIR — directory containing ceres.lib
let found = vcpkg::find_package("ceres")
.map(|lib| {
lib.include_paths.iter().for_each(|p| {
cc_build.include(p);
// In vcpkg, Eigen3 headers live under include/eigen3/ rather than
// include/ directly. Ceres' own headers use `#include <Eigen/Core>`,
// so we must add the eigen3 sub-directory as an include root.
let eigen_sub = p.join("eigen3");
if eigen_sub.exists() {
cc_build.include(eigen_sub);
}
});
true
})
.unwrap_or(false);
// Shlwapi is a Windows system library required by glog (for path utilities);
// always link it regardless of whether ceres was found via vcpkg or env vars.
println!("cargo:rustc-link-lib=dylib=shlwapi");
if !found {
if let Ok(dir) = std::env::var("CERES_INCLUDE_DIR") {
cc_build.include(&dir);
}
if let Ok(dir) = std::env::var("EIGEN3_INCLUDE_DIR") {
cc_build.include(&dir);
}
if let Ok(dir) = std::env::var("CERES_LIB_DIR") {
println!("cargo:rustc-link-search=native={}", dir);
}
// Ceres and its required dependencies when linking statically
println!("cargo:rustc-link-lib=ceres");
println!("cargo:rustc-link-lib=glog");
}
} else {
if let Ok(library) = pkg_config::Config::new()
.range_version("3.3.4".."4.0.0")
.probe("eigen3")
{
library.include_paths.into_iter().for_each(|path| {
cc_build.include(path);
});
}
match pkg_config::Config::new()
.range_version("2.2.0".."3.0.0")
.probe("ceres")
{
Ok(library) => library.include_paths.into_iter().for_each(|path| {
cc_build.include(path);
}),
Err(_) => {
println!("cargo:rustc-link-lib=dylib=ceres");
// Ceres installed with Homebrew on Apple Silicon
#[cfg(all(target_os = "macos", target_arch = "aarch64"))]
{
cc_build.include("/opt/homebrew/include");
cc_build.include("/opt/homebrew/include/eigen3");
println!("cargo:rustc-link-search=/opt/homebrew/lib");
}
}
}
}
}
cc_build.compile("ceres-solver-sys");
}