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From: Jean-Pierre Flori <jpflori@gmail.com>
Date: Wed, 2 Apr 2014 00:07:12 +0200
Message-ID: <CAHhGz8_eESbCpCWivD_G9ciFbE4VsZntZyRdOOOtd2PXUSsmgg@mail.gmail.com>
Subject: Possibly wrong address passed to callq asm instruction within MPIR test binaries
To: cygwin@cygwin.com
Cc: Bill Hart <goodwillhart@googlemail.com>
Content-Type: text/plain; charset=UTF-8

Dear all,

It's amazing to see how well Cygwin64 is going.
Thanks for your hard work.

While preparing the new MPIR release, which will be the first one to
support Cygwin4, we encountered problems running MPIR testsuite when
MPIR was configured to produce a shared lib.
That's with latest cygwin/binutils/gcc/g++ from today.

It seems that a call to the MPN_ZERO macro, which on my setup is at
0x4ff2746c0 in the shared lib but we get the instruction:
callq 0xff2746c0
within the test binary and that yields a nice segfault.
Please see https://groups.google.com/d/msg/mpir-devel/KzsxIWhVx8A/EAUoP4ybWOMJ
and the few following post for more details.

For sure, we don't get what's going on here.
Would you have any clue?
Might ld decide for some reason to trim the macro address to 4 bytes
rather than 8?

Best,

-- 
Jean-Pierre Flori

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