OPENSSL_USER_MACROS(7SSL) OpenSSL OPENSSL_USER_MACROS(7SSL)
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: 30500
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>.
3.5.4 2025-09-30 OPENSSL_USER_MACROS(7SSL)
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