51 lines
1.8 KiB
Plaintext
51 lines
1.8 KiB
Plaintext
@node assert.h
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@section @file{assert.h}
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POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/assert.h.html}
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Gnulib module: assert-h
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@mindex assert-h
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@mindex assert
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@mindex verify
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See also the Gnulib modules @code{assert} and @code{verify}.
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Portability problems fixed by Gnulib:
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@itemize
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@item
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On older C platforms @code{<assert.h>} must be included before using
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@code{static_assert}. For example, GCC versions before 13 do not
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support the @code{static_assert} keyword that was standardized by C23.
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@item
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On older platforms @code{static_assert} does not allow the second
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string-literal argument to be omitted. For example, GCC versions
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before 9.1 do not support the single-argument @code{static_assert}
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that was standardized by C23 and C++17.
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@item
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Even-older platforms do not support @code{static_assert} at all.
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For example, GCC versions before 4.6 and G++ versions before 4.3
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do not support the two-argument form, which was standardized
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by C11 and C++11.
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@item
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Older C platforms might not support the obsolescent
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@code{_Static_assert} keyword or macro.
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This portability problem should not matter with code using this
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module, as such code should use @code{static_assert} instead.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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A @code{static_assert} can also
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be used within a @code{struct} or @code{union} specifier, in place of
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an ordinary declaration of a member of the struct or union. The
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Gnulib substitute can be used only as an ordinary declaration
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in code intended to be portable to C99 or earlier.
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@item
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In C23 and C++11 and later, @code{static_assert} is a keyword.
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In C11 and C17 it is a macro. Any Gnulib substitute is also a macro.
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@item
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In C99 and later, @code{assert} can be applied to any scalar expression.
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In C89, the argument to @code{assert} is of type @code{int}.
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@end itemize
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