Silence warning in Visual Studio 2010 when using zdouble about cppad

[bradbell]

I now have visual studio 2013 up and running without without warnings, expect for the fact that asctime and gmtime are not thread safe (which I have decided to leave for the time being).

Would you please provide a simple example that results in the warnings you intend to fix here and (so I can add it to the CppAD tests to make sure that the fix works).

[Loutjie]

The warning appear at every call to ‘Forward(0, x)’;

Example:

     std::vector<CppAD::AD<CppAD::zdouble>> vdX(1);

     std::vector<CppAD::AD<CppAD::zdouble>> vdY(1);

     CppAD::ADFun<CppAD::zdouble> Function;

     std::vector<CppAD::zdouble> vdX2(1);

     std::vector<CppAD::zdouble> vdY2(1);

     vdX[0] = 10.0;

     Independent(vdX);

     vdY[0] = vdX[0]*2.0;

     Function.Dependent(vdX, vdY);

     vdX2[0] = 20.0;

     vdY2 = Function.Forward(0, vdX2); // Generates warnings during compilation

If I add this template constructor

template
/// Constructor from double
zdouble(const Base& value)
: dbl_((double)value)
{ }

And remove the double constructor

                /// Constructor from double
     /*zdouble(const double& dbl)
     : dbl_(dbl)
     { }*/

Then the warnings are silenced.

Kind regards

Loutjie

From: Brad Bell [mailto:[email protected]]
Sent: 2015 September 22 07:36 PM
To: coin-or/CppAD
Cc: Loutjie
Subject: Re: [CppAD] Silence warning in Visual Studio 2010 when using zdouble (#10)

I now have visual studio 2013 up and running without without warnings, expect for the fact that asctime and gmtime are not thread safe (which I have decided to leave for the time being).

Would you please provide a simple example that results in the warnings you intend to fix here and (so I can add it to the CppAD tests to make sure that the fix works).

—
Reply to this email directly or view it on GitHub #10 (comment) . https://github.com/notifications/beacon/AM7EHxXoOUkgr7kYkJdDJIl1MHaHPDNSks5o0YjogaJpZM4FmpYj.gif

[Loutjie]

We compile at Warning Level 4.

From: Brad Bell [mailto:[email protected]]
Sent: 2015 September 22 07:36 PM
To: coin-or/CppAD
Cc: Loutjie
Subject: Re: [CppAD] Silence warning in Visual Studio 2010 when using zdouble (#10)

I now have visual studio 2013 up and running without without warnings, expect for the fact that asctime and gmtime are not thread safe (which I have decided to leave for the time being).

Would you please provide a simple example that results in the warnings you intend to fix here and (so I can add it to the CppAD tests to make sure that the fix works).

—
Reply to this email directly or view it on GitHub #10 (comment) . https://github.com/notifications/beacon/AM7EHxXoOUkgr7kYkJdDJIl1MHaHPDNSks5o0YjogaJpZM4FmpYj.gif

[bradbell]

Warning level 4
https://msdn.microsoft.com/en-us/library/thxezb7y.aspx
is the key. It is generating lots more warnings in my tests. I will look
at them.

Brad.

On 9/22/2015 10:15 PM, Loutjie wrote:

We compile at Warning Level 4.

From: Brad Bell [mailto:[email protected]]
Sent: 2015 September 22 07:36 PM
To: coin-or/CppAD
Cc: Loutjie
Subject: Re: [CppAD] Silence warning in Visual Studio 2010 when using
zdouble (#10)

I now have visual studio 2013 up and running without without warnings,
expect for the fact that asctime and gmtime are not thread safe (which
I have decided to leave for the time being).

Would you please provide a simple example that results in the warnings
you intend to fix here and (so I can add it to the CppAD tests to make
sure that the fix works).

—
Reply to this email directly or view it on GitHub
#10 (comment) .
https://github.com/notifications/beacon/AM7EHxXoOUkgr7kYkJdDJIl1MHaHPDNSks5o0YjogaJpZM4FmpYj.gif

—
Reply to this email directly or view it on GitHub
#10 (comment).

[bradbell]

On 9/22/2015 10:14 PM, Loutjie wrote:

The warning appear at every call to ‘Forward(0, x)’;

... snip ...

I have made some recent changes and now get no warning (with Visual
Studio 2013) with the following steps in a Windows CMD window
mkdir build
cd build
cmake -G "NMake Makefiles" -D cppad_cxx_flags="/W4" ..
nmake check_example
see
5787b4a

Note that this includes no warnings when compiling the file
https://github.com/coin-or/CppAD/blob/master/example/zdouble.cpp
and that files has order zero forward mode computations (using zdouble)
in it; see the code
z = g.Forward(0, x);
and consider the case where Base = zdouble.

In addition, I have tried replacing zdouble.cpp by the following (at
your suggestion) and still get no warning when executing 'nmake
check_example'.

include <cppad/cppad.hpp>

bool zdouble(void)
{ bool ok = true;
using std::cout;
//
std::vectorCppAD::ADCppAD::zdouble vdX(1);
std::vectorCppAD::ADCppAD::zdouble vdY(1);
CppAD::ADFunCppAD::zdouble Function;
std::vectorCppAD::zdouble vdX2(1);
std::vectorCppAD::zdouble vdY2(1);
vdX[0] = 10.0;
Independent(vdX);
vdY[0] = vdX[0]*2.0;
Function.Dependent(vdX, vdY);
vdX2[0] = 20.0;
vdY2 = Function.Forward(0, vdX2); // Generates warnings during
compilation
//
return ok;
}
~

[bradbell]

If one uses the Visual Studio 2013 and the windows download, extraction, and testing instructions on
http://www.coin-or.org/CppAD/Doc/download.htm#Compressed%20Archives.Windows%20File%20Extraction%20and%20Testing
the only warnings are

1. C4996: gmtime and asctime my be unsafe.
2. LNK4044: unrecognized option '/openmp'; ignored
   The functions asctime and gmtime are called when onlly one thread is active and there does not seem to be a standard way to get a thread safe version of these functions. The option /openmp is generated by cmake and is not valid for Visual Studio 2013 (but I think it works for 2015)

Note that the CppAD source code now suppresses the warnings

1. C4100 unreferenced formal parameter
2. C4127 conditional expression is constant
   This is mentioned under the heading 09-24 on
   http://www.coin-or.org/CppAD/Doc/whats_new_15.htm#09-24
   CppAD uses the same signature for similar routines that in some cases do not use formal parameters. In addition, it has asserts for expressions that are constant.