libmdbx: switch to original amalgamated source code (v0.9.1.18)

Amalgamated source code is the recommended form for
embedding libmdbx in non-CMake build systems. This amalgamated
version contains a minimum of files, is fully ready for use,
and make impossible a number of errors.

To upgrade or switch to a different version, just unpack
to the `src` subdirectory a corresponding `libmdbx-amalgamated-X_Y_Z.zip`
at the https://github.com/erthink/libmdbx/releases.

For instance, the https://github.com/erthink/libmdbx/releases/download/v0.9.2/libmdbx-amalgamated-0_9_2.zip
for the next release.

--

Minimal changes have been made to the build configuration:

1. For use the standard `DllMain()` entry of libmdbx:
   - added the `MDBX_BUILD_SHARED_LIBRARY=1` option;
   - removed the `MDBX_CONFIG_MANUAL_TLS_CALLBACK` option;
   - deleted the `miranda.c` file containing only `DllMain()`
     with the `mdbx_dll_handle()` call, now this is done by the library itself.

2. Removed refs to extra files (that missing in the amalgamated source code):
   - for building `libmdbx.dll` only the `mdbx.h` and `mdbx.c` are used,
     but not `mdbx.c++` for a C++ API;
   - for building the `mdbx_chk`, `mdbx_load`, and `mdbx_dump` utilities
     only it own sources are used.

--

Last libmdbx changes:

 - Fixed missing installation of `mdbx.h++`.
 - Fixed use of obsolete `__noreturn`.
 - Fixed use of `yield` instruction on ARM if unsupported.
 - Added pthread workaround for buggy toolchain/cmake/buildroot.
 - Fixed use of `pthread_yield()` for non-GLIBC.
 - Fixed use of `RegGetValueA()` on Windows 2000/XP.
 - Fixed use of `GetTickCount64()` on Windows 2000/XP.
 - Fixed opening DB on a network shares (in the exclusive mode).
 - Fixed copy&paste typos.
 - Fixed minor false-positive GCC warning.

4 files changed, 0 insertions, 196 deletions

diff --git a/libs/libmdbx/src/example/CMakeLists.txt b/libs/libmdbx/src/example/CMakeLists.txt
deleted file mode 100644
index d3e56e82e9..0000000000
--- a/libs/libmdbx/src/example/CMakeLists.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-set(TARGET mdbx_example)
-project(${TARGET})
-
-add_executable(${TARGET} example-mdbx.c)
-
-target_link_libraries(${TARGET} mdbx)
diff --git a/libs/libmdbx/src/example/README.md b/libs/libmdbx/src/example/README.md
deleted file mode 100644
index b819cf4a40..0000000000
--- a/libs/libmdbx/src/example/README.md
+++ /dev/null
@@ -1 +0,0 @@
-See [example-mdbx.c](example-mdbx.c) as an example of using _libmdbx_, and do a line-by-line comparison of it with the [sample-bdb.txt](sample-bdb.txt) file.
diff --git a/libs/libmdbx/src/example/example-mdbx.c b/libs/libmdbx/src/example/example-mdbx.c
deleted file mode 100644
index 0a9e7ed601..0000000000
--- a/libs/libmdbx/src/example/example-mdbx.c
+++ /dev/null
@@ -1,112 +0,0 @@
-/* MDBX usage examle
- *
- * Do a line-by-line comparison of this and sample-bdb.txt
- */
-
-/*
- * Copyright 2015-2020 Leonid Yuriev <leo@yuriev.ru>.
- * Copyright 2017 Ilya Shipitsin <chipitsine@gmail.com>.
- * Copyright 2012-2015 Howard Chu, Symas Corp.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-
-#include "mdbx.h"
-#include <stdio.h>
-#include <stdlib.h>
-
-int main(int argc, char *argv[]) {
-  (void)argc;
-  (void)argv;
-
-  int rc;
-  MDBX_env *env = NULL;
-  MDBX_dbi dbi = 0;
-  MDBX_val key, data;
-  MDBX_txn *txn = NULL;
-  MDBX_cursor *cursor = NULL;
-  char sval[32];
-
-  rc = mdbx_env_create(&env);
-  if (rc != MDBX_SUCCESS) {
-    fprintf(stderr, "mdbx_env_create: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  }
-  rc = mdbx_env_open(env, "./example-db",
-                     MDBX_NOSUBDIR | MDBX_COALESCE | MDBX_LIFORECLAIM, 0664);
-  if (rc != MDBX_SUCCESS) {
-    fprintf(stderr, "mdbx_env_open: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  }
-
-  rc = mdbx_txn_begin(env, NULL, 0, &txn);
-  if (rc != MDBX_SUCCESS) {
-    fprintf(stderr, "mdbx_txn_begin: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  }
-  rc = mdbx_dbi_open(txn, NULL, 0, &dbi);
-  if (rc != MDBX_SUCCESS) {
-    fprintf(stderr, "mdbx_dbi_open: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  }
-
-  key.iov_len = sizeof(int);
-  key.iov_base = sval;
-  data.iov_len = sizeof(sval);
-  data.iov_base = sval;
-
-  sprintf(sval, "%03x %d foo bar", 32, 3141592);
-  rc = mdbx_put(txn, dbi, &key, &data, 0);
-  if (rc != MDBX_SUCCESS) {
-    fprintf(stderr, "mdbx_put: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  }
-  rc = mdbx_txn_commit(txn);
-  if (rc) {
-    fprintf(stderr, "mdbx_txn_commit: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  }
-  txn = NULL;
-
-  rc = mdbx_txn_begin(env, NULL, MDBX_RDONLY, &txn);
-  if (rc != MDBX_SUCCESS) {
-    fprintf(stderr, "mdbx_txn_begin: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  }
-  rc = mdbx_cursor_open(txn, dbi, &cursor);
-  if (rc != MDBX_SUCCESS) {
-    fprintf(stderr, "mdbx_cursor_open: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  }
-
-  int found = 0;
-  while ((rc = mdbx_cursor_get(cursor, &key, &data, MDBX_NEXT)) == 0) {
-    printf("key: %p %.*s, data: %p %.*s\n", key.iov_base, (int)key.iov_len,
-           (char *)key.iov_base, data.iov_base, (int)data.iov_len,
-           (char *)data.iov_base);
-    found += 1;
-  }
-  if (rc != MDBX_NOTFOUND || found == 0) {
-    fprintf(stderr, "mdbx_cursor_get: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  } else {
-    rc = MDBX_SUCCESS;
-  }
-bailout:
-  if (cursor)
-    mdbx_cursor_close(cursor);
-  if (txn)
-    mdbx_txn_abort(txn);
-  if (dbi)
-    mdbx_dbi_close(env, dbi);
-  if (env)
-    mdbx_env_close(env);
-  return (rc != MDBX_SUCCESS) ? EXIT_FAILURE : EXIT_SUCCESS;
-}
diff --git a/libs/libmdbx/src/example/sample-bdb.txt b/libs/libmdbx/src/example/sample-bdb.txt
deleted file mode 100644
index 0f5e190a5e..0000000000
--- a/libs/libmdbx/src/example/sample-bdb.txt
+++ /dev/null
@@ -1,77 +0,0 @@
-/* BerkeleyDB toy/sample
- *
- * Do a line-by-line comparison of this and example-mdbx.c
- */
-
-/*
- * Copyright 2015-2020 Leonid Yuriev <leo@yuriev.ru>.
- * Copyright 2012-2015 Howard Chu, Symas Corp.
- * Copyright 2015,2016 Peter-Service R&D LLC.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-
-#include <stdio.h>
-#include <string.h>
-#include <db.h>
-
-int main(int argc,char * argv[])
-{
-	int rc;
-	DB_ENV *env;
-	DB *dbi;
-	DBT key, data;
-	DB_TXN *txn;
-	DBC *cursor;
-	char sval[32], kval[32];
-
-	/* Note: Most error checking omitted for simplicity */
-
-#define FLAGS (DB_INIT_LOCK|DB_INIT_LOG|DB_INIT_TXN|DB_INIT_MPOOL|DB_CREATE|DB_THREAD)
-	rc = db_env_create(&env, 0);
-	rc = env->open(env, "./testdb", FLAGS, 0664);
-	rc = db_create(&dbi, env, 0);
-	rc = env->txn_begin(env, NULL, &txn, 0);
-	rc = dbi->open(dbi, txn, "test.bdb", NULL, DB_BTREE, DB_CREATE, 0664);
-
-	memset(&key, 0, sizeof(DBT));
-	memset(&data, 0, sizeof(DBT));
-	key.size = sizeof(int);
-	key.data = sval;
-	data.size = sizeof(sval);
-	data.data = sval;
-
-	sprintf(sval, "%03x %d foo bar", 32, 3141592);
-	rc = dbi->put(dbi, txn, &key, &data, 0);
-	rc = txn->commit(txn, 0);
-	if (rc) {
-		fprintf(stderr, "txn->commit: (%d) %s\n", rc, db_strerror(rc));
-		goto leave;
-	}
-	rc = env->txn_begin(env, NULL, &txn, 0);
-	rc = dbi->cursor(dbi, txn, &cursor, 0);
-	key.flags = DB_DBT_USERMEM;
-	key.data = kval;
-	key.ulen = sizeof(kval);
-	data.flags = DB_DBT_USERMEM;
-	data.data = sval;
-	data.ulen = sizeof(sval);
-	while ((rc = cursor->c_get(cursor, &key, &data, DB_NEXT)) == 0) {
-		printf("key: %p %.*s, data: %p %.*s\n",
-			key.data,  (int) key.size,  (char *) key.data,
-			data.data, (int) data.size, (char *) data.data);
-	}
-	rc = cursor->c_close(cursor);
-	rc = txn->abort(txn);
-leave:
-	rc = dbi->close(dbi, 0);
-	rc = env->close(env, 0);
-	return rc;
-}