| <!-- | |
| Copyright (C) Daniel Stenberg, <[email protected]>, et al. | |
| SPDX-License-Identifier: curl | |
| --> | |
| # curl internals | |
| The canonical libcurl internals documentation is now in the [everything | |
| curl](https://everything.curl.dev/internals) book. This file lists supported | |
| versions of libs and build tools. | |
| ## Portability | |
| We write curl and libcurl to compile with C89 compilers on 32-bit and up | |
| machines. Most of libcurl assumes more or less POSIX compliance but that is | |
| not a requirement. | |
| We write libcurl to build and work with lots of third party tools, and we | |
| want it to remain functional and buildable with these and later versions | |
| (older versions may still work but is not what we work hard to maintain): | |
| ## Dependencies | |
| We aim to support these or later versions. | |
| - OpenSSL 0.9.7 | |
| - GnuTLS 3.1.10 | |
| - zlib 1.1.4 | |
| - libssh2 1.0 | |
| - c-ares 1.16.0 | |
| - libidn2 2.0.0 | |
| - wolfSSL 2.0.0 | |
| - OpenLDAP 2.0 | |
| - MIT Kerberos 1.2.4 | |
| - Heimdal ? | |
| - nghttp2 1.15.0 | |
| - Winsock 2.2 (on Windows 95+ and Windows CE .NET 4.1+) | |
| ## Build tools | |
| When writing code (mostly for generating stuff included in release tarballs) | |
| we use a few "build tools" and we make sure that we remain functional with | |
| these versions: | |
| - GNU Libtool 1.4.2 | |
| - GNU Autoconf 2.59 | |
| - GNU Automake 1.7 | |
| - GNU M4 1.4 | |
| - perl 5.8 | |
| - roffit 0.5 | |
| - cmake 3.7 | |
| Library Symbols | |
| =============== | |
| All symbols used internally in libcurl must use a `Curl_` prefix if they are | |
| used in more than a single file. Single-file symbols must be made static. | |
| Public ("exported") symbols must use a `curl_` prefix. Public API functions | |
| are marked with `CURL_EXTERN` in the public header files so that all others | |
| can be hidden on platforms where this is possible. | |