Drop support for GDAL pre-3.4

.github/workflows/ci.yml

@@ -32,9 +32,6 @@ jobs:
           - 3.6.4
           - 3.5.3
           - 3.4.3
-          - 3.3.3
-          - 3.2.3
-          - 3.1.3 # latest is 3.1.4, but there's no published image
 
     runs-on: ubuntu-latest
     container:

CHANGES.md

@@ -4,6 +4,7 @@
 
 ### Breaking
 
+  - Drop support for GDAL <3.4 ([#578](https://github.com/georust/gdal/pull/578))
   - Regenerate the pre-built bindings with `std::ffi` instead of `libc` for C types ([#573](https://github.com/georust/gdal/pull/573))
   - Upgrade `ndarray` dependency to 0.16 ([#569](https://github.com/georust/gdal/pull/569))
 

README.md

@@ -34,11 +34,11 @@ Using the `gdal-sys` crate directly is normally not needed, but it can be useful
 
 ## Version support
 
-As a general rule, only GDAL versions in Ubuntu LTS-1 (previous LTS version, that is, GDAL 3.0 in 20.04 at this moment) are supported.
+As a general rule, only GDAL versions in Ubuntu LTS-1 (previous LTS version, that is, GDAL 3.4 in 22.04 at this moment) are supported.
 `gdal-sys` might support earlier versions using the `bindgen` feature flag, but `gdal` does not.
 
 Building this crate assumes a compatible version of GDAL is installed with the corresponding header files and shared libraries.
-This repository includes pre-generated bindings for GDAL 3.0 through 3.10 (see the `gdal-sys/prebuilt-bindings` directory).
+This repository includes pre-generated bindings for GDAL 3.4 through 3.10 (see the `gdal-sys/prebuilt-bindings` directory).
 If you're compiling against another version of GDAL, you can enable the `bindgen` feature flag to have the bindings generated on the fly.
 
 ## Community

build.rs

@@ -14,8 +14,8 @@ fn main() {
     let minor = (gdal_version - major * 1000000) / 10000;
     let patch = (gdal_version - major * 1000000 - minor * 10000) / 100;
 
-    if major < 3 {
-        panic!("The GDAL crate requires a GDAL version >= 3.0.0. Found {major}.{minor}.{patch}");
+    if major < 3 || major == 4 && minor < 4 {
+        panic!("The GDAL crate requires a GDAL version >= 3.4.0. Found {major}.{minor}.{patch}");
     }
 
     println!("cargo:rustc-cfg=gdal_{major}");