mdbx: drop unnecessary MDBX_HUGE_TRANSACTIONS option.

Change-Id: I86116c2bada268d6e0a5c97deff808aaffe3e599

CMakeLists.txt

@@ -438,7 +438,6 @@ add_mdbx_option(MDBX_BUILD_TOOLS "Build MDBX tools (mdbx_chk/stat/dump/load/copy
 CMAKE_DEPENDENT_OPTION(MDBX_INSTALL_MANPAGES "Install man-pages for MDBX tools (mdbx_chk/stat/dump/load/copy)" ON MDBX_BUILD_TOOLS OFF)
 add_mdbx_option(MDBX_TXN_CHECKOWNER "Checking transaction matches the calling thread inside libmdbx's API" ON)
 add_mdbx_option(MDBX_ENV_CHECKPID "Paranoid checking PID inside libmdbx's API" AUTO)
-add_mdbx_option(MDBX_HUGE_TRANSACTIONS "Support for huge write-transactions" OFF)
 mark_as_advanced(MDBX_ENV_CHECKPID)
 if(${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
   add_mdbx_option(MDBX_DISABLE_GNU_SOURCE "Don't use GNU/Linux libc extensions" OFF)

ChangeLog.md

@@ -11,6 +11,12 @@ ChangeLog
  - Finalize C++ API (few typos and trivia bugs are still likely for now).
  - Packages for ROSA Linux, ALT Linux, Fedora/RHEL, Debian/Ubuntu.
 
+
+Removed options and features:
+
+  - Drop `MDBX_HUGE_TRANSACTIONS` build-option (now no longer required).
+
+
 ## v0.9.2 scheduled at 2020-11-27
 
 Acknowledgements:

src/config.h.in

@@ -12,7 +12,6 @@
 #cmakedefine MDBX_FORCE_ASSERTIONS
 
 /* Common */
-#cmakedefine01 MDBX_HUGE_TRANSACTIONS
 #cmakedefine01 MDBX_TXN_CHECKOWNER
 #cmakedefine MDBX_ENV_CHECKPID_AUTO
 #ifndef MDBX_ENV_CHECKPID_AUTO

src/core.c

@@ -20101,9 +20101,6 @@ __dll_export
 #else
     #error "FIXME: Unsupported byte order"
 #endif /* __BYTE_ORDER__ */
-#if MDBX_HUGE_TRANSACTIONS
-    " MDBX_HUGE_TRANSACTIONS=YES"
-#endif /* MDBX_HUGE_TRANSACTIONS */
     " MDBX_ENV_CHECKPID=" MDBX_ENV_CHECKPID_CONFIG
     " MDBX_TXN_CHECKOWNER=" MDBX_TXN_CHECKOWNER_CONFIG
     " MDBX_64BIT_ATOMIC=" MDBX_64BIT_ATOMIC_CONFIG

src/options.h

@@ -41,11 +41,6 @@
 
 #endif /* DOXYGEN */
 
-/** Enables support for huge write-transactions */
-#ifndef MDBX_HUGE_TRANSACTIONS
-#define MDBX_HUGE_TRANSACTIONS 0
-#endif /* MDBX_HUGE_TRANSACTIONS */
-
 /** Using fcntl(F_FULLFSYNC) with 5-10 times slowdown */
 #define MDBX_OSX_WANNA_DURABILITY 0
 /** Using fsync() with chance of data lost on power failure */