Hello Yary,

It depends what you mean by “limit.” AFAICT, Perl has never prevented subroutine recursion to arbitrary depth; but if warnings are in use, it has always warned about Deep recursion when the recursion depth reaches a certain pre-set limit. From perl5101delta#New-or-Changed-Diagnostics:

Deep recursion on subroutine "%s"

• It is now possible to change the depth threshold for this warning from the default of 100, by recompiling the perl binary, setting the C pre-processor macro PERL_SUB_DEPTH_WARN to the desired value.

On my Strawberry Perl, this limit is still set to the default:

13:24 >perl -wE "$|++; say ''; sub f { print qq($_[0] ); if ($_[0] >= 
+99) { say 'Bye!'; } else { f($_[0] + 1); } } f(1);"

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 2
+7 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 5
+0 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 7
+3 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 9
+6 97 98 99 Bye!

13:24 >perl -wE "$|++; say ''; sub f { print qq($_[0] ); if ($_[0] >= 
+100) { say 'Bye!'; } else { f($_[0] + 1); } } f(1);"

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 2
+7 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 5
+0 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 7
+3 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 9
+6 97 98 99 Deep recursion on subroutine "main::f" at -e line 1.
100 Bye!

13:24 >perl -v

This is perl 5, version 22, subversion 0 (v5.22.0) built for MSWin32-x
+64-multi-thread
[download]

Hope that helps,