replace tsearch test with code from gnulib, to hopefully address silviprog's android problems

1 files changed, 60 insertions, 0 deletions

diff --git a/m4/search_h.m4 b/m4/search_h.m4
new file mode 100644
index 00000000..6aaaf36e
--- /dev/null
+++ b/m4/search_h.m4
@@ -0,0 +1,60 @@
+# search_h.m4 serial 9
+dnl Copyright (C) 2007-2017 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_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 Assume proper GNU behavior unless another module says otherwise.
+  HAVE_TSEARCH=1;    AC_SUBST([HAVE_TSEARCH])
+  REPLACE_TSEARCH=0; AC_SUBST([REPLACE_TSEARCH])
+])