C Library: Difference between revisions
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==Versions== |
==Versions== |
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The C standard describes two versions of the standard library: the |
The C standard describes two versions of the standard library: the complete hosted library and the freestanding one, providing only a subset of the hosted library that doesn't need to interact with the environment. System software should typically use the former, while applications should have the latter available. |
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The <tt>__STDC_HOSTED__</tt> macro expands to <tt>1</tt> on hosted implementations, or <tt>0</tt> on freestanding ones. The freestanding headers are: <tt><float.h></tt>, <tt><iso646.h></tt>, <tt><limits.h></tt>, <tt><stdalign.h></tt>, <tt><stdarg.h></tt>, <tt><stdbool.h></tt>, <tt><stddef.h></tt>, <tt><stdint.h></tt>, and <tt><stdnoreturn.h></tt>. |
The <tt>__STDC_HOSTED__</tt> macro expands to <tt>1</tt> on hosted implementations, or <tt>0</tt> on freestanding ones. The freestanding headers are: <tt><float.h></tt>, <tt><iso646.h></tt>, <tt><limits.h></tt>, <tt><stdalign.h></tt>, <tt><stdarg.h></tt>, <tt><stdbool.h></tt>, <tt><stddef.h></tt>, <tt><stdint.h></tt>, and <tt><stdnoreturn.h></tt>. |
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===Newlib=== |
===Newlib=== |
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* The license is unrestricted (not GPL or LGPL), but each file likely has a different copyright notice. |
* The license is unrestricted (not GPL or LGPL), but each file likely has a different copyright notice. |
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* Requires threading, so is more appropriate for a runtime library |
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* [http://sourceware.org/newlib/ newlib website] |
* [http://sourceware.org/newlib/ newlib website] |
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