| # 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 |
| - GSKit V5R3M0 |
| - NSS 3.14.x |
| - Heimdal ? |
| - nghttp2 1.12.0 |
| - 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 5.004 |
| - roffit 0.5 |
| - nroff any version that supports `-man [in] [out]` |
| - 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. |
