configure: fixed checks for tsearch() and related

New check works correctly with new compilers.
Added known problematic implementations.
Added more checks for correct behaviour.
Removed some m4 macros.

1 files changed, 0 insertions, 64 deletions

diff --git a/m4/tsearch.m4 b/m4/tsearch.m4
deleted file mode 100644
index 9f8782e4..00000000
--- a/m4/tsearch.m4
+++ /dev/null
@@ -1,64 +0,0 @@
-# tsearch.m4 serial 8
-dnl Copyright (C) 2006-2021 Free Software Foundation, Inc.
-dnl This file is free software; the Free Software Foundation
-dnl gives unlimited permission to copy and/or distribute it,
-dnl with or without modifications, as long as this notice is preserved.
-
-AC_DEFUN([gl_FUNC_TSEARCH],
-[
-  AC_REQUIRE([gl_SEARCH_H_DEFAULTS])
-  AC_CHECK_FUNCS([tsearch twalk])
-  if test $ac_cv_func_tsearch = yes; then
-    dnl On OpenBSD 4.0, the return value of tdelete() is incorrect.
-    AC_REQUIRE([AC_PROG_CC])
-    AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
-    AC_CACHE_CHECK([whether tdelete works], [gl_cv_func_tdelete_works],
-      [
-        AC_RUN_IFELSE([AC_LANG_SOURCE([[
-#include <stddef.h>
-#include <search.h>
-static int
-cmp_fn (const void *a, const void *b)
-{
-  return *(const int *) a - *(const int *) b;
-}
-int
-main ()
-{
-  int result = 0;
-  int x = 0;
-  void *root = NULL;
-  if (!(tfind (&x, &root, cmp_fn) == NULL))
-    result |= 1;
-  tsearch (&x, &root, cmp_fn);
-  if (!(tfind (&x, &root, cmp_fn) != NULL))
-    result |= 2;
-  if (!(tdelete (&x, &root, cmp_fn) != NULL))
-    result |= 4;
-  return result;
-}]])], [gl_cv_func_tdelete_works=yes], [gl_cv_func_tdelete_works=no],
-            [case "$host_os" in
-               openbsd*) gl_cv_func_tdelete_works="guessing no" ;;
-                         # Guess yes on native Windows.
-               mingw*)   gl_cv_func_tdelete_works="guessing yes" ;;
-               *)        gl_cv_func_tdelete_works="guessing yes" ;;
-             esac
-            ])
-      ])
-    case "$gl_cv_func_tdelete_works" in
-      *no)
-        REPLACE_TSEARCH=1
-        ;;
-    esac
-  else
-    HAVE_TSEARCH=0
-  fi
-  if test $ac_cv_func_twalk != yes; then
-    HAVE_TWALK=0
-  fi
-])
-
-# Prerequisites of lib/tsearch.c.
-AC_DEFUN([gl_PREREQ_TSEARCH], [
-  :
-])