mirror of https://github.com/openssl/openssl.git
21 lines
748 B
Markdown
21 lines
748 B
Markdown
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Notes on POSIX
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==============
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There are few instances where OpenSSL requires a POSIX C library, at least
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version 1-2008, or compatible enough functionality.
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There are exceptions, though, for platforms that do not have a POSIX
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library, or where there are quirks that need working around. A notable
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platform is Windows, where POSIX functionality may be available, but where
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the function names are prefixed with an underscore, and where some POSIX
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types are not present (such as `ssize_t`).
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Platforms that do have a POSIX library may still not have them accessible
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unless the following macros are defined:
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_POSIX_C_SOURCE=200809L
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_XOPEN_SOURCE=1
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This is, for example, the case when building with gcc or clang and using the
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flag `-ansi`.
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