move reallocarray test into libc-misc

ci.sh

@@ -108,7 +108,7 @@ case $HOST_TARGET in
     MIRI_TEST_TARGET=aarch64-unknown-linux-gnu run_tests
     MIRI_TEST_TARGET=aarch64-apple-darwin run_tests
     MIRI_TEST_TARGET=i686-pc-windows-gnu run_tests
-    MIRI_TEST_TARGET=x86_64-unknown-freebsd run_tests_minimal hello integer vec panic/panic concurrency/simple pthreads-threadname libc-getentropy libc-getrandom libc-reallocarray libc-misc atomic env/var
+    MIRI_TEST_TARGET=x86_64-unknown-freebsd run_tests_minimal hello integer vec panic/panic concurrency/simple pthreads-threadname libc-getentropy libc-getrandom libc-misc atomic env/var
     MIRI_TEST_TARGET=aarch64-linux-android run_tests_minimal hello integer vec panic/panic
     MIRI_TEST_TARGET=wasm32-wasi run_tests_minimal no_std integer strings wasm
     MIRI_TEST_TARGET=wasm32-unknown-unknown run_tests_minimal no_std integer strings wasm

tests/pass-dep/shims/libc-misc.rs

@@ -390,6 +390,19 @@ fn test_dlsym() {
     assert_eq!(errno, libc::EBADF);
 }
 
+#[cfg(not(target_os = "macos"))]
+fn test_reallocarray() {
+    unsafe {
+        let mut p = libc::reallocarray(std::ptr::null_mut(), 4096, 2);
+        assert!(!p.is_null());
+        libc::free(p);
+        p = libc::malloc(16);
+        let r = libc::reallocarray(p, 2, 32);
+        assert!(!r.is_null());
+        libc::free(r);
+    }
+}
+
 fn main() {
     test_posix_gettimeofday();
 
@@ -412,6 +425,10 @@ fn main() {
     test_memcpy();
     test_strcpy();
 
+    #[cfg(not(target_os = "macos"))] // reallocarray does not exist on macOS
+    test_reallocarray();
+
+    // These are Linux-specific
     #[cfg(target_os = "linux")]
     {
         test_posix_fadvise();