NAME

       openssl_user_macros, OPENSSL_API_COMPAT, OPENSSL_NO_DEPRECATED - User defined macros

DESCRIPTION

       User defined macros allow the programmer to control certain aspects of what is exposed by the OpenSSL
       headers.

       NOTE: to be effective, a user defined macro must be defined before including any header file that depends
       on it, either in the compilation command ("cc -DMACRO=value") or by defining the macro in source before
       including any headers.

       Other manual pages may refer to this page when declarations depend on user defined macros.

   The macros
       OPENSSL_API_COMPAT
           The value is a version number, given in one of the following two forms:

           "0xMNNFF000L"
               This is the form supported for all versions up to 1.1.x, where "M" represents the major number,
               "NN" represents the minor number, and "FF" represents the fix number, as a hexadecimal number.
               For version 1.1.0, that's "0x10100000L".

               Any version number may be given, but these numbers are the current known major deprecation
               points, making them the most meaningful:

               "0x00908000L" (version 0.9.8)
               "0x10000000L" (version 1.0.0)
               "0x10100000L" (version 1.1.0)

               For convenience, higher numbers are accepted as well, as long as feasible.  For example,
               "0x60000000L" will work as expected.  However, it is recommended to start using the second form
               instead:

           "mmnnpp"
               This form is a simple decimal number calculated with this formula:

               major * 10000 + minor * 100 + patch

               where major, minor and patch are the desired major, minor and patch components of the version
               number.  For example:

               30000 corresponds to version 3.0.0
               10002 corresponds to version 1.0.2
               420101 corresponds to version 42.1.1

           If OPENSSL_API_COMPAT is undefined, this default value is used in its place: 30000

       OPENSSL_NO_DEPRECATED
           If this macro is defined, all deprecated public symbols in all OpenSSL versions up to and including
           the version given by OPENSSL_API_COMPAT (or the default value given above, when OPENSSL_API_COMPAT
           isn't defined) will be hidden.

COPYRIGHT

       Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use this file except in compliance
       with the License.  You can obtain a copy in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.