34 lines
1.3 KiB
Plaintext
34 lines
1.3 KiB
Plaintext
/*
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* Copyright 2019 Haiku, Inc. All rights reserved.
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* Distributed under the terms of the MIT License.
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*
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* Authors:
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* Adrien Destugues, pulkomandy@pulkomandy.tk
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*/
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/*!
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\page libroot C, POSIX, GNU and BSD functions
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Haiku implements a standard library containing the standard functions from C
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(https://www.iso.org/standard/29237.html) and POSIX
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(https://pubs.opengroup.org/onlinepubs/9699919799/). These functions are
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available in libroot, which is linked in by default.
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For convenience and POSIX compatibility, empty "m" and "pthread" libraries are
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also provided, but the math and thread functions are also defined in libroot.
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The C library also contains a number of GNU and BSD extensions to the C and
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POSIX standards. The BSD extensions are enabled by default unless a specific
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version of the C standard is requested from the compiler command line (for
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example by using the --std=c99 switch). In case you want to set the compiler
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to strict C99 but still use these extensions, you need to define _DEFAULT_SOURCE
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(with a \#define preprocessor directive, or from the command line).
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The GNU extensions are not enabled by default, but can be enabled by defining
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_GNU_SOURCE.
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The GNU and BSD extensions are in a separate library, so the -lbsd linker flag
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may be needed to use them.
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*/
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