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Subject: Re: cygwin x86_64: mingw64-g++ 6.4.0 (both i686 and x86_64) issue (bug?) with reinterpret_cast
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From: JonY <10walls AT gmail DOT com>
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Date: Mon, 23 Oct 2017 23:25:04 +0000
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From: JonY <10walls AT gmail DOT com>
To: cygwin AT cygwin DOT com
Message-ID: <b5eb7686-58b7-6501-b7a5-d8cb255d3921 AT gmail DOT com>
Subject: Re: cygwin x86_64: mingw64-g++ 6.4.0 (both i686 and x86_64) issue
 (bug?) with reinterpret_cast
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On 10/23/2017 02:47 PM, Paolo ZAMBOTTI wrote:
> Hello,
>=20
> I'm having some issues while compiling C++ code with mingw64 c++ compiler=
 (6.4.0) distributed within Cygwin packages.
> I can guess the issue I'm going to report is not strictly related to Cygw=
in distribution but I cannot test other mingw64 distributions so let me sta=
rt reporting the issue here...
> Once said that, I'm open to any suggestions for better reporting place...
>=20
> I'm not an expert in C and even less in C++ so I hope to not generate stu=
pid noise... but the same code was compiling fine with previous version (5.=
4) ...
>=20

Neither am I.

> The attached file is the simplest example that triggers the issue.
>=20
> If I try to compile with "x86_64-w64-mingw32-gcc -o test.exe test.cpp" th=
e output is the following
>=20
> test.cpp: In function 'int main(int, char**)':
> test.cpp:7:34: error: reinterpret_cast from integer to pointer
>    static constexpr void* test2 =3D (void*)(-1LL);
>                                   ^~~~~~~~~~~~~
>=20
> While, if I try to compile with "i686-w64-mingw32-gcc -o test.exe test.cp=
p" the output is the following
>=20
> test.cpp: In function 'int main(int, char**)':
> test.cpp:12:34: error: reinterpret_cast from integer to pointer
>    static constexpr void* test2 =3D (void*)(-1L);
>                                   ^~~~~~~~~~~~
>=20

As a comparison, both -1L and -1LL fails for me on 64bit Linux with
gcc-6.4.0.

> The test is effectively build to always fail but the current behavior is =
exactly the opposite of what I was expecting:
> x86_64 complains with (-1LL) cast while I was expecting it to fail on (-1=
L)
> i686 complains with (-1L) cast while I was expecting it to fail on (-1LL)
>=20

I think it is best to check with gcc-help what the correct behavior is.


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