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From:	SJ Luo <sjaluo AT gmail DOT com>
Date:	Sat, 28 Apr 2018 19:41:11 +0800
Message-ID:	<CAMoHPCY=hMwHco8=quQ0zpvPDw3srMxjzM6v9u-ZcdgQ_6avNw@mail.gmail.com>
Subject:	perl-Win32-API package problem
To:	cygwin AT cygwin DOT com
X-MIME-Autoconverted:	from quoted-printable to 8bit by delorie.com id w3SBfWZZ014397

Hi,

  I have a small Perl program that utilize module
Win32::API::Callback. This module works properly if I downloaded this
module from CPAN and compile by myself. There occurs a problem if I
get it from binary package perl-Win32-API downloaded by Cygwin setup
program. I then tried to figure this problem out by downloading source
module and compile by myself. I found a simple flow to duplicate the
fail with the following sequence.

----- Cut here -----
% cd /usr/src/perl-Win32-API-0.84-1.src
% cygport perl-Win32-API.cygport prep compile
    :
% cd perl-Win32-API-0.84-1.x86_64/build/
% mv API_test64.dll API_test64.dll.lnk; cp API_test64.dll.lnk API_test64.dll
% mv rtc64.dll rtc64.dll.lnk; cp rtc64.dll.lnk rtc64.dll
% cd Callback
% make test
    :
    (Failed test 'callback function works' at t/02_Callback.t line 58.)
    :
% touch Callback.c
% make
% make test
    :
    (All tests passed)
    :
----- Cut here -----

  The two lines of commands "mv xxxx; cp xxx" are to dereference the
symbolic links of testing-needed dll files because
Win32::API::LoadLibrary() seems not be able to resolve Cygwin symbolic
link.
  Two "make test" commands are shown above. The first test fails at
02_Callback.t line 75. After fail, a force recompile of the
Callback.dll module is done by touch and make. Doing "make test"
again, this time all test items passed.

  By checking the gcc compile option, I found there is a gcc option
"-fno-stack-protector" provided when I compile this module by myself,
while the option is removed when I compile with cygport. If I try
manually compiling without this option, the same problem occurs.

The host system is Windows7. Cygwin dll is 64bit version 2.10.0-1.
wish it can be solved soon in next package release.

Thanks,
SJ
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