Support building without default features

Author: kornelski

.github/workflows/ci.yml

@@ -58,7 +58,7 @@ jobs:
           path: target
           key: clippy-${{ steps.rust-version.outputs.version }}-${{ hashFiles('Cargo.lock') }}
       - name: Run clippy
-        run: cargo clippy --all --all-targets
+        run: cargo clippy --all --all-targets --features rpk,mlkem
       - name: Check docs
         run: cargo doc --no-deps -p boring -p boring-sys -p hyper-boring -p tokio-boring --features rpk,underscore-wildcards
         env:
@@ -415,9 +415,15 @@ jobs:
     - name: Install Rust (rustup)
       run: rustup update stable --no-self-update && rustup default stable
       shell: bash
+    - run: cargo check --no-default-features
+      name: Check `--no-default-features`
+    - run: cargo check --features mlkem,credential
+      name: Check `mlkem,credential`
     - run: cargo test --features rpk
       name: Run `rpk` tests
     - run: cargo test --features underscore-wildcards
       name: Run `underscore-wildcards` tests
     - run: cargo test --features rpk,underscore-wildcards
       name: Run `rpk,underscore-wildcards` tests
+    - run: cargo test --features rpk,underscore-wildcards,mlkem
+      name: Run `rpk,underscore-wildcards` tests

Cargo.toml

@@ -20,9 +20,9 @@ tag-prefix = ""
 publish = false
 
 [workspace.dependencies]
-boring-sys = { version = "5.0.0", path = "./boring-sys" }
-boring = { version = "5.0.0", path = "./boring" }
-tokio-boring = { version = "5.0.0", path = "./tokio-boring" }
+boring-sys = { version = "5.0.0", path = "./boring-sys", default-features = false }
+boring = { version = "5.0.0", path = "./boring", default-features = false }
+tokio-boring = { version = "5.0.0", path = "./tokio-boring", default-features = false }
 
 bindgen = { version = "0.72.0", default-features = false, features = ["runtime"] }
 bitflags = "2.9"

boring/Cargo.toml

@@ -17,7 +17,7 @@ features = ["rpk", "underscore-wildcards"]
 rustdoc-args = ["--cfg", "docsrs"]
 
 [features]
-# Controlling the build
+default = []
 
 # Use a FIPS-validated version of BoringSSL.
 fips = ["boring-sys/fips"]

hyper-boring/Cargo.toml

@@ -16,6 +16,8 @@ features = []
 rustdoc-args = ["--cfg", "docsrs"]
 
 [features]
+default = ["boring/default", "tokio-boring/default"]
+
 # Use a FIPS-validated version of boringssl.
 fips = ["boring/fips", "tokio-boring/fips"]
 
@@ -25,9 +27,9 @@ http = { workspace = true }
 hyper = { workspace = true }
 hyper-util = { workspace = true, features = ["client", "client-legacy"] }
 linked_hash_set = { workspace = true }
-boring = { workspace = true }
+boring = { workspace = true, default-features = false }
 tokio = { workspace = true }
-tokio-boring = { workspace = true }
+tokio-boring = { workspace = true, default-features = false  }
 tower-layer = { workspace = true }
 tower-service = { workspace = true }
 

tokio-boring/Cargo.toml

@@ -17,15 +17,17 @@ features = ["rpk"]
 rustdoc-args = ["--cfg", "docsrs"]
 
 [features]
+default = ["boring/default"]
+
 # Use a FIPS-validated version of boringssl.
 fips = ["boring/fips", "boring-sys/fips"]
 
 # Enables Raw public key API (https://datatracker.ietf.org/doc/html/rfc7250)
 rpk = ["boring/rpk"]
 
 [dependencies]
-boring = { workspace = true }
-boring-sys = { workspace = true }
+boring = { workspace = true, default-features = false }
+boring-sys = { workspace = true, default-features = false }
 tokio = { workspace = true }
 
 [dev-dependencies]