Re: [PATCH 2/3] posix: Remove alloca usage on regex build_trtable

[Paul Eggert]

On 1/6/21 10:17 AM, Adhemerval Zanella wrote:
> __libc_use_alloca/alloca is replaced with malloc regardless.

These allocations are so small that they should be put on the stack 
instead of using malloc. I did that in Gnulib by installing the attached 
patch. The idea is that the resulting regexec.c file should be copyable 
unchanged into glibc.

From a Gnulib point of view this code uses a 20 KiB frame (on a 64-bit 
host) which goes past the usual 4032-byte limit for stack frames, but I 
think we can stretch the point here.  In glibc the limit is 64 KiB so 
there's no problem.

0001-regexec-remove-alloca-usage-in-build_trtable.patch
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