Provide a bundled flag for gdal-sys

This commit introduces a new `gdal-src` crate which bundles gdal and
builds a minimal version from source via `build.rs`

Fixes georust#465

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "gdal-src/source"]
+	path = gdal-src/source
+	url = https://github.com/OSGeo/gdal

Cargo.toml

@@ -36,11 +36,17 @@ tempfile = "3.8"
 arrow2 = "0.18"
 
 [workspace]
-members = ["gdal-sys"]
+members = [ "gdal-src","gdal-sys"]
 
 # docs.rs-specific configuration
 [package.metadata.docs.rs]
 # include `array` feature in documentation
 features = ["array"]
 # define attribute `docsrs` for feature badges
 rustdoc-args = ["--cfg", "docsrs"]
+
+
+[patch.crates-io]
+proj-sys = { git = "https://github.com/GiGainfosystems/proj", rev = "73797d3b4601b5770b16f0e1cdb656d51295b471" }
+libsqlite3-sys = { git = "https://github.com/GiGainfosystems/rusqlite/", rev = "e60d993" }
+

gdal-src/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "gdal-src"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+proj-sys = { version = "0.23.2", features = ["bundled_proj"] }
+libsqlite3-sys = { version = "0.27.0", features = ["bundled"] }
+
+[build-dependencies]
+cmake = "0.1.50"

gdal-src/build.rs

@@ -0,0 +1,46 @@
+fn main() {
+    let sqlite3_include_dir =
+        std::env::var("DEP_SQLITE3_INCLUDE").expect("This is set by libsqlite3-sys");
+    let sqlite3_lib_dir = std::env::var("DEP_SQLITE3_LIB_DIR").expect("set by libsqlite3-sys");
+    let proj_root = std::env::var("DEP_PROJ_ROOT").expect("set by proj-sys");
+
+    let res = cmake::Config::new("source")
+        .define("GDAL_BUILD_OPTIONAL_DRIVERS", "OFF")
+        .define("OGR_BUILD_OPTIONAL_DRIVERS", "OFF")
+        .define("GDAL_USE_INTERNAL_LIBS", "ON")
+        .define("GDAL_USE_EXTERNAL_LIBS", "OFF")
+        .define("BUILD_SHARED_LIBS", "OFF")
+        .define("BUILD_STATIC_LIBS", "ON")
+        .define("BUILD_APPS", "OFF")
+        .define("BUILD_DOCS", "OFF")
+        .define("BUILD_TESTING", "OFF")
+        .define("BUILD_GMOCK", "OFF")
+        .define("PROJ_INCLUDE_DIRS", format!("{proj_root}/include"))
+        .define("PROJ_LIBRARY_DIRS", format!("{proj_root}/lib64/"))
+        // enable the gpkg driver
+        .define("GDAL_USE_SQLITE3", "ON")
+        .define("SQLite3_INCLUDE_DIR", sqlite3_include_dir)
+        .define("SQLite3_LIBRARY", format!("{sqlite3_lib_dir}/libsqlite3.a"))
+        .define("OGR_ENABLE_DRIVER_GPKG", "ON")
+        .pic(true)
+        .build();
+
+    // sometimes it's lib and sometimes it's lib64 and sometimes `build/lib`
+    let lib_dir = res.join("lib64");
+    println!(
+        "cargo:rustc-link-search=native={}",
+        lib_dir.to_str().unwrap()
+    );
+    let lib_dir = res.join("lib");
+    println!(
+        "cargo:rustc-link-search=native={}",
+        lib_dir.to_str().unwrap()
+    );
+    let lib_dir = res.join("build/lib");
+    println!(
+        "cargo:rustc-link-search=native={}",
+        lib_dir.to_str().unwrap()
+    );
+
+    println!("cargo:rustc-link-lib=static={}", "gdal");
+}

gdal-src/src/lib.rs

@@ -0,0 +1,2 @@
+extern crate libsqlite3_sys;
+extern crate proj_sys;

gdal-sys/Cargo.toml

@@ -12,8 +12,14 @@ links="gdal"
 
 [dependencies]
 libc = "0.2"
+gdal-src = { path = "../gdal-src/", optional = true}
 
 [build-dependencies]
 bindgen = { version = "0.69", optional = true }
 pkg-config = "0.3"
 semver = "1.0"
+
+
+[features]
+default = []
+bundled = ["dep:gdal-src"]

gdal-sys/build.rs

@@ -68,7 +68,7 @@ fn main() {
 
     // Hardcode a prebuilt binding version while generating docs.
     // Otherwise docs.rs will explode due to not actually having libgdal installed.
-    if std::env::var("DOCS_RS").is_ok() {
+    if std::env::var("DOCS_RS").is_ok() || cfg!(feature = "bundled") {
         let version = Version::parse("3.8.0").expect("invalid version for docs.rs");
         println!(
             "cargo:rustc-cfg=gdal_sys_{}_{}_{}",

gdal-sys/src/lib.rs

@@ -4,4 +4,7 @@
 #![allow(clippy::upper_case_acronyms)]
 #![allow(rustdoc::bare_urls)]
 
+#[cfg(feature = "bundled")]
+extern crate gdal_src;
+
 include!(concat!(env!("OUT_DIR"), "/bindings.rs"));