57 lines
1.7 KiB
Markdown
57 lines
1.7 KiB
Markdown
# curl internals
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The canonical libcurl internals documentation is now in the [everything
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curl](https://everything.curl.dev/internals) book. This file lists supported
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versions of libs and build tools.
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## Portability
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We write curl and libcurl to compile with C89 compilers on 32-bit and up
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machines. Most of libcurl assumes more or less POSIX compliance but that is
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not a requirement.
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We write libcurl to build and work with lots of third party tools, and we
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want it to remain functional and buildable with these and later versions
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(older versions may still work but is not what we work hard to maintain):
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## Dependencies
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We aim to support these or later versions.
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- OpenSSL 0.9.7
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- GnuTLS 3.1.10
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- zlib 1.1.4
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- libssh2 1.0
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- c-ares 1.16.0
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- libidn2 2.0.0
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- wolfSSL 2.0.0
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- OpenLDAP 2.0
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- MIT Kerberos 1.2.4
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- Heimdal ?
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- nghttp2 1.15.0
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- WinSock 2.2 (on Windows 95+ and Windows CE .NET 4.1+)
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## Build tools
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When writing code (mostly for generating stuff included in release tarballs)
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we use a few "build tools" and we make sure that we remain functional with
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these versions:
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- GNU Libtool 1.4.2
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- GNU Autoconf 2.59
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- GNU Automake 1.7
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- GNU M4 1.4
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- perl 5.6
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- roffit 0.5
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- nroff any version that supports `-man [in] [out]`
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- cmake 3.7
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Library Symbols
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===============
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All symbols used internally in libcurl must use a `Curl_` prefix if they are
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used in more than a single file. Single-file symbols must be made static.
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Public ("exported") symbols must use a `curl_` prefix. Public API functions
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are marked with `CURL_EXTERN` in the public header files so that all others
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can be hidden on platforms where this is possible.
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