Add smol as an executor

.github/workflows/sqlx.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-24.04
     strategy:
       matrix:
-        runtime: [ async-std, tokio ]
+        runtime: [ smol, tokio ]
         tls: [ native-tls, rustls, none ]
     steps:
       - uses: actions/checkout@v4
@@ -118,7 +118,7 @@ jobs:
     runs-on: ubuntu-24.04
     strategy:
       matrix:
-        runtime: [ async-std, tokio ]
+        runtime: [ smol, tokio ]
         linking: [ sqlite, sqlite-unbundled ]
     needs: check
     steps:
@@ -187,7 +187,7 @@ jobs:
     strategy:
       matrix:
         postgres: [ 17, 13 ]
-        runtime: [ async-std, tokio ]
+        runtime: [ smol, tokio ]
         tls: [ native-tls, rustls-aws-lc-rs, rustls-ring, none ]
     needs: check
     steps:
@@ -288,7 +288,7 @@ jobs:
     strategy:
       matrix:
         mysql: [ 8 ]
-        runtime: [ async-std, tokio ]
+        runtime: [ smol, tokio ]
         tls: [ native-tls, rustls-aws-lc-rs, rustls-ring, none ]
     needs: check
     steps:
@@ -377,7 +377,7 @@ jobs:
     strategy:
       matrix:
         mariadb: [ verylatest, 11_4, 10_11, 10_4 ]
-        runtime: [ async-std, tokio ]
+        runtime: [ smol, tokio ]
         tls: [ native-tls, rustls-aws-lc-rs, rustls-ring, none ]
     needs: check
     steps:

Cargo.toml

@@ -78,6 +78,7 @@ _unstable-all-types = [
 
 # Base runtime features without TLS
 runtime-async-std = ["_rt-async-std", "sqlx-core/_rt-async-std", "sqlx-macros?/_rt-async-std"]
+runtime-smol = ["_rt-smol", "sqlx-core/_rt-smol", "sqlx-macros?/_rt-smol"]
 runtime-tokio = ["_rt-tokio", "sqlx-core/_rt-tokio", "sqlx-macros?/_rt-tokio"]
 
 # TLS features
@@ -96,11 +97,15 @@ tls-none = []
 runtime-async-std-native-tls = ["runtime-async-std", "tls-native-tls"]
 runtime-async-std-rustls = ["runtime-async-std", "tls-rustls-ring"]
 
+runtime-smol-native-tls = ["runtime-smol", "tls-native-tls"]
+runtime-smol-rustls = ["runtime-smol", "tls-rustls-ring"]
+
 runtime-tokio-native-tls = ["runtime-tokio", "tls-native-tls"]
 runtime-tokio-rustls = ["runtime-tokio", "tls-rustls-ring"]
 
 # for conditional compilation
 _rt-async-std = []
+_rt-smol = []
 _rt-tokio = []
 _sqlite = []
 
@@ -154,12 +159,17 @@ time = { version = "0.3.36", features = ["formatting", "parsing", "macros"] }
 uuid = "1.1.2"
 
 # Common utility crates
+cfg-if = "1.0.0"
 dotenvy = { version = "0.15.0", default-features = false }
 
 # Runtimes
 [workspace.dependencies.async-std]
 version = "1.12"
 
+[workspace.dependencies.smol]
+version = "2.0"
+default-features = false
+
 [workspace.dependencies.tokio]
 version = "1"
 features = ["time", "net", "sync", "fs", "io-util", "rt"]

sqlx-cli/src/database.rs

@@ -13,7 +13,7 @@ pub async fn create(connect_opts: &ConnectOpts) -> anyhow::Result<()> {
     let exists = crate::retry_connect_errors(connect_opts, Any::database_exists).await?;
 
     if !exists {
-        #[cfg(feature = "_sqlite")]
+        #[cfg(any(feature = "sqlite", feature = "sqlite-unbundled"))]
         sqlx::sqlite::CREATE_DB_WAL.store(
             connect_opts.sqlite_create_db_wal,
             std::sync::atomic::Ordering::Release,

sqlx-cli/src/opt.rs

@@ -262,7 +262,7 @@ pub struct ConnectOpts {
     /// However, if your application sets a `journal_mode` on `SqliteConnectOptions` to something
     /// other than `Wal`, then it will have to take the database file out of WAL mode on connecting,
     /// which requires an exclusive lock and may return a `database is locked` (`SQLITE_BUSY`) error.
-    #[cfg(feature = "_sqlite")]
+    #[cfg(any(feature = "sqlite", feature = "sqlite-unbundled"))]
     #[clap(long, action = clap::ArgAction::Set, default_value = "true")]
     pub sqlite_create_db_wal: bool,
 }

sqlx-core/Cargo.toml

@@ -20,6 +20,7 @@ json = ["serde", "serde_json"]
 
 # for conditional compilation
 _rt-async-std = ["async-std", "async-io"]
+_rt-smol = ["smol"]
 _rt-tokio = ["tokio", "tokio-stream"]
 _tls-native-tls = ["native-tls"]
 _tls-rustls-aws-lc-rs = ["_tls-rustls", "rustls/aws-lc-rs", "webpki-roots"]
@@ -34,6 +35,7 @@ offline = ["serde", "either/serde"]
 [dependencies]
 # Runtimes
 async-std = { workspace = true, optional = true }
+smol = { workspace = true, optional = true }
 tokio = { workspace = true, optional = true }
 
 # TLS
@@ -53,9 +55,10 @@ ipnetwork = { workspace = true, optional = true }
 mac_address = { workspace = true, optional = true }
 uuid = { workspace = true, optional = true }
 
-async-io = { version = "1.9.0", optional = true }
+async-io = { package = "async-io", version = "1.9.0", optional = true }
 base64 = { version = "0.22.0", default-features = false, features = ["std"] }
 bytes = "1.1.0"
+cfg-if = { workspace = true }
 chrono = { version = "0.4.34", default-features = false, features = ["clock"], optional = true }
 crc = { version = "3", optional = true }
 crossbeam-queue = "0.3.2"