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manual: Document unsupported cases for interposition

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These functions call the core allocator functions (realloc and malloc
respectively) and are hence guaranteed to allocate memory using the
correct functions when multiple allocators are interposed.  Having
these functions interposed in one allocator and not another may result
in confusion, hence discourage interposing them altogether.

Reviewed-by: Florian Weimer <fweimer@redhat.com>
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Siddhesh Poyarekar 2021-07-23 20:26:01 +05:30
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manual/memory.texi
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@ -1864,6 +1864,13 @@ when a replacement @code{malloc} is in use. However, failure to replace
these functions typically does not result in crashes or other incorrect
application behavior, but may result in static linking failures.
There are other functions (@code{reallocarray}, @code{strdup}, etc.) in
@theglibc{} that are not listed above but return newly allocated memory to
callers. Replacement of these functions is not supported and may produce
incorrect results. @Theglibc{} implementations of these functions call
the replacement allocator functions whenever available, so they will work
correctly with @code{malloc} replacement.
@node Obstacks
@subsection Obstacks
@cindex obstacks