1 files changed, 55 insertions, 0 deletions
diff --git a/stdlib/tst-const.c b/stdlib/tst-const.c
new file mode 100644
index 0000000000..89662fd6c7
--- /dev/null
+++ b/stdlib/tst-const.c
@@ -0,0 +1,55 @@
+/* Test bsearch const-generic macro.
+   Copyright (C) 2025 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <stdlib.h>
+#include <libc-diag.h>
+
+void *vp;
+const void *cvp;
+int *ip;
+const int *cip;
+size_t sz;
+int (*compar) (const void *, const void *);
+
+#define CHECK_TYPE(EXPR, TYPE)					\
+  _Static_assert (_Generic (EXPR, TYPE: 1), "type check")
+
+static int
+do_test (void)
+{
+  /* This is a compilation test.  */
+  CHECK_TYPE (bsearch (cvp, cvp, sz, sz, compar), const void *);
+  CHECK_TYPE (bsearch (cvp, vp, sz, sz, compar), void *);
+  CHECK_TYPE (bsearch (vp, cvp, sz, sz, compar), const void *);
+  CHECK_TYPE (bsearch (vp, vp, sz, sz, compar), void *);
+  CHECK_TYPE (bsearch (cvp, cip, sz, sz, compar), const void *);
+  CHECK_TYPE (bsearch (cvp, ip, sz, sz, compar), void *);
+  CHECK_TYPE (bsearch (vp, cip, sz, sz, compar), const void *);
+  CHECK_TYPE (bsearch (vp, ip, sz, sz, compar), void *);
+  DIAG_PUSH_NEEDS_COMMENT;
+  /* This deliberately tests the type of the result with a null
+     pointer constant argument.  */
+  DIAG_IGNORE_NEEDS_COMMENT (14, "-Wnonnull");
+  CHECK_TYPE (bsearch (cvp, 0, sz, sz, compar), void *);
+  CHECK_TYPE (bsearch (cvp, (void *) 0, sz, sz, compar), void *);
+  DIAG_POP_NEEDS_COMMENT;
+  CHECK_TYPE ((bsearch) (cvp, cvp, sz, sz, compar), void *);
+  return 0;
+}
+
+#include <support/test-driver.c>