Remove the curl-compat feature

Cargo.toml

@@ -143,10 +143,6 @@ make-cmd = "0.1"
 target = "2.0"
 syn = { version = "2", features = ["full"] }  # git-version fails to parse inner macros without this.
 
-[build-dependencies.rustflags]
-version = "0.1"
-optional = true
-
 [dev-dependencies]
 tempfile = "3"
 
@@ -160,8 +156,6 @@ panic = "abort"
 [features]
 default = ["full-version", "version-check"]
 full-version = ["dep:concat_const", "dep:git-version"]
-# libcurl.so compatibility (Linux only).
-curl-compat = ["rustflags"]
 # Check and report when a new version is available.
 version-check = ["shared_child"]
 # Download and apply new versions.

build.rs

@@ -209,45 +209,6 @@ fn main() {
     println!("cargo:rerun-if-env-changed=CC");
     println!("cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS");
 
-    #[cfg(feature = "curl-compat")]
-    {
-        use rustflags::Flag;
-        if target_os != "linux" {
-            panic!("The curl-compat feature is only supported on linux");
-        } else if std::env::var("DEP_CURL_STATIC").is_ok() {
-            panic!("The curl-compat feature is not compatible with building curl statically");
-        }
-        let mut cmd = compiler.to_command();
-        cmd.args(&[
-            "-shared",
-            "-Wl,-soname,libcurl.so.4",
-            "src/curl-compat.c",
-            "-o",
-        ]);
-        let curl_dir = PathBuf::from(env_os("OUT_DIR"));
-        cmd.arg(curl_dir.join("libcurl.so"));
-        if let Ok(include) = std::env::var("DEP_CURL_INCLUDE") {
-            cmd.arg(format!("-I{}", normalize_path(&include)));
-        }
-        cmd.args(rustflags::from_env().flat_map(|flag| match flag {
-            Flag::Codegen {
-                opt,
-                value: Some(value),
-            } if opt == "link-arg" => vec![value],
-            Flag::Codegen {
-                opt,
-                value: Some(value),
-            } if opt == "link-args" => value.split(' ').map(ToString::to_string).collect(),
-            _ => vec![],
-        }));
-        match cmd.status() {
-            Ok(s) if s.success() => {}
-            _ => panic!("Failed to build libcurl.so with command {:?}", cmd),
-        }
-        println!("cargo:rerun-if-changed=src/curl-compat.c");
-        println!("cargo:rustc-link-search=native={}", curl_dir.display());
-    }
-
     assert!(cmd
         .env("MAKEFLAGS", format!("-j {}", env("CARGO_MAKEFLAGS")))
         .current_dir(&out_dir)