[PATCH v10 00/11] malloc hooks removal

[Siddhesh Poyarekar]

On 7/20/21 12:16 AM, Siddhesh Poyarekar via Libc-alpha wrote:
> This patchset removes the malloc hooks __malloc_hook, __free_hook,
> __realloc_hook and __memalign_hook from the API and leaves compatibility
> symbols so that existing applications can continue to link to them.  The
> reading and execution of the hooks has been moved to a DSO
> libc_malloc_debug.so, which can be preloaded for applications that need
> it.  By default these hooks no longer have any effect in the library.
> 
> Further, debugging features such as MALLOC_CHECK_, mcheck() and mtrace
> have been weaned away from these hooks and also moved to
> libc_malloc_debug.so.  With this change, these features are only enabled
> when libc_malloc_debug.so is preloaded using LD_PRELOAD.
> 
> Finally, the __morecore, __morecore_after_hook and __default_morecore
> hooks have also been moved to compat symbols and removed from the API.
> Existing applications will continue to link to them but they won't have
> any effect on malloc behaviour.
> 
> Testing:
> 
> - x86_64 - --prefix=/usr:
>    No new failures
> - x86_64, i686, s390x, ppc64le, armv7l, aarch64 - Fedora config:
>    No new failures
> - build-many-glibcs:
>    In progress

Finally after a few hurdles I have managed to finish the 
build-many-glibcs run and it has finished cleanly with the exception of 
alpha-linux-gnu, which failed when building compilers.  It appears to be 
due to the fix for pr27283 not being on the 2.36 branch.

Siddhesh