boring-sys v5 backwards-compat

Author: kornelski

boring-sys/Cargo.toml

@@ -64,6 +64,15 @@ rpk = []
 # `BORING_BSSL{,_FIPS}_SOURCE_PATH`.
 underscore-wildcards = []
 
+# UNSUPPORTED. Do not use. Fails the build.
+fips-link-precompiled = []
+
+# UNSUPPORTED. Do not use. Fails the build.
+fips-precompiled = []
+
+# UNSUPPORTED. Do not use. Fails the build.
+pq-experimental = []
+
 [build-dependencies]
 bindgen = { workspace = true }
 cmake = { workspace = true }

boring-sys/build/main.rs

@@ -723,3 +723,12 @@ fn ensure_err_lib_enum_is_named(source_code: &mut Vec<u8>) {
             .as_bytes(),
     );
 }
+
+#[cfg(feature = "pq-experimental")]
+compile_error!("boring-sys v5 has removed the `pq-experimental` Cargo feature. Unset it.");
+
+#[cfg(feature = "fips-precompiled")]
+compile_error!("boring-sys v5 has removed the `fips-precompiled` Cargo feature. Unset it, and use the `fips` feature instead.");
+
+#[cfg(feature = "fips-link-precompiled")]
+compile_error!("boring-sys v5 has removed the `fips-link-precompiled` Cargo feature. Unset it, and use the `fips` feature instead.");