test: Add basic configuration to use ctest-next

Set up a Cargo dependency on ctest-next, which is now published as a
beta version of ctest. Includes a backport of only the libc-test
portions of d8cc878 ("ctest-next: miscellaneous filtering bug
fixes") to reduce conflicts with future cherry picks.

Co-authored-by: mbyx <[email protected]>

Author: tgross35

Cargo.lock

@@ -22,6 +22,8 @@ annotate-snippets = { version = "0.11.5", features = ["testing-colors"] }
 cc = "1.2.29"
 # FIXME: Use fork ctest until the maintainer gets back.
 ctest2 = "0.4.3"
+# Use the in-tree `ctest` from the `main` branch via crates.io
+ctest_next = { version = "0.5.0-beta.0", package = "ctest" }
 regex = "1.11.1"
 
 [features]
@@ -35,6 +37,11 @@ name = "ctest"
 path = "test/ctest.rs"
 harness = false
 
+[[test]]
+name = "ctest_next"
+path = "test/ctest_next.rs"
+harness = false
+
 [[test]]
 name = "linux-fcntl"
 path = "test/linux_fcntl.rs"

libc-test/Cargo.toml

@@ -84,6 +84,11 @@ fn ctest_cfg() -> ctest::TestGenerator {
     cfg
 }
 
+#[expect(unused)]
+fn ctest_next_cfg() -> ctest_next::TestGenerator {
+    ctest_next::TestGenerator::new()
+}
+
 fn do_semver() {
     let mut out = PathBuf::from(env::var("OUT_DIR").unwrap());
     out.push("semver.rs");
@@ -171,6 +176,14 @@ fn main() {
     let re = regex::bytes::Regex::new(r"(?-u:\b)crate::").unwrap();
     copy_dir_hotfix(Path::new("../src"), &hotfix_dir, &re, b"::");
 
+    // FIXME(ctest): Only needed until ctest-next supports all tests.
+    // Provide a default for targets that don't yet use `ctest-next`.
+    std::fs::write(
+        format!("{}/main_next.rs", std::env::var("OUT_DIR").unwrap()),
+        "\nfn main() { println!(\"test result: ok\"); }\n",
+    )
+    .unwrap();
+
     do_cc();
     do_ctest();
     do_semver();

libc-test/build.rs

@@ -0,0 +1,5 @@
+#[allow(deprecated)]
+#[allow(unused_imports)]
+use libc::*;
+
+include!(concat!(env!("OUT_DIR"), "/main_next.rs"));