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fail to compile last perl source under cygwin 2.9.0


I tried to build perl-5.26.0 with GCC 7.2.0 (build from source with cygwin's GCC 5.4.0) and failed with the following error:

pp.c: In function 'Perl_pp_crypt':
pp.c:3743:43: error: invalid application of 'sizeof' to incomplete type 'struct crypt_data'
    (struct crypt_data *)safemalloc(sizeof(struct crypt_data));

Currently i cannot figure out whether this is crypt's or perl's fault. Any help appreciated.

When i was under cygwin 2.8.2, everything was ok.
If, under 2.9.0, i force "#undef HAS_CRYPT_R" in config.h, everything is ok.
I cannot say if it works with GCC 5.4.0, but i'm pretty sure that it doesn't.


Denis Excoffier.
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