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, 66 deletions

diff --git a/m4/search_h.m4 b/m4/search_h.m4
deleted file mode 100644
index 9fafc716..00000000
--- a/m4/search_h.m4
+++ /dev/null
@@ -1,66 +0,0 @@
-# search_h.m4 serial 12
-dnl Copyright (C) 2007-2021 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_SEARCH_H],
-[
-  AC_REQUIRE([gl_SEARCH_H_DEFAULTS])
-  gl_CHECK_NEXT_HEADERS([search.h])
-  if test $ac_cv_header_search_h = yes; then
-    HAVE_SEARCH_H=1
-  else
-    HAVE_SEARCH_H=0
-  fi
-  AC_SUBST([HAVE_SEARCH_H])
-
-  if test $HAVE_SEARCH_H = 1; then
-    AC_CACHE_CHECK([for type VISIT], [gl_cv_type_VISIT],
-      [AC_COMPILE_IFELSE(
-         [AC_LANG_PROGRAM(
-            [[#if HAVE_SEARCH_H
-               #include <search.h>
-              #endif
-            ]],
-            [[static VISIT x; x = postorder;]])],
-         [gl_cv_type_VISIT=yes],
-         [gl_cv_type_VISIT=no])])
-  else
-    gl_cv_type_VISIT=no
-  fi
-  if test $gl_cv_type_VISIT = yes; then
-    HAVE_TYPE_VISIT=1
-  else
-    HAVE_TYPE_VISIT=0
-  fi
-  AC_SUBST([HAVE_TYPE_VISIT])
-
-  dnl Check for declarations of anything we want to poison if the
-  dnl corresponding gnulib module is not in use.
-  gl_WARN_ON_USE_PREPARE([[#include <search.h>
-    ]], [tdelete tfind tsearch twalk])
-
-  AC_REQUIRE([AC_C_RESTRICT])
-])
-
-AC_DEFUN([gl_SEARCH_MODULE_INDICATOR],
-[
-  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
-  AC_REQUIRE([gl_SEARCH_H_DEFAULTS])
-  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
-  dnl Define it also as a C macro, for the benefit of the unit tests.
-  gl_MODULE_INDICATOR_FOR_TESTS([$1])
-])
-
-AC_DEFUN([gl_SEARCH_H_DEFAULTS],
-[
-  GNULIB_TSEARCH=0; AC_SUBST([GNULIB_TSEARCH])
-  dnl Support Microsoft deprecated alias function names by default.
-  GNULIB_MDA_LFIND=1;   AC_SUBST([GNULIB_MDA_LFIND])
-  GNULIB_MDA_LSEARCH=1; AC_SUBST([GNULIB_MDA_LSEARCH])
-  dnl Assume proper GNU behavior unless another module says otherwise.
-  HAVE_TSEARCH=1;    AC_SUBST([HAVE_TSEARCH])
-  HAVE_TWALK=1;      AC_SUBST([HAVE_TWALK])
-  REPLACE_TSEARCH=0; AC_SUBST([REPLACE_TSEARCH])
-])