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<p class="MsoNormal">A follow up:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The compiler option <span style="font-size:9.0pt;font-family:Monaco;color:#1D1C1D">
'-Wno-bad-function-cast' </span>did not work for c++. See message below:<o:p></o:p></p>
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<span style="font-size:9.0pt;font-family:Monaco;color:#1D1C1D">cc1plus: error: command line option '-Wno-bad-function-cast' is valid for C/ObjC but not for C++ [-Werror]<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Credit to David Andrs of INL, here is an alternative solution:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Monaco;color:black">MatFDColoringSetFunction(fdcoloring, </span><span style="font-size:9.0pt;font-family:Monaco;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Monaco;color:black"> (PetscErrorCode(*)(void))(void(*)(void))SNESFormFunction, this);</span><span style="font-size:9.0pt;font-family:Monaco;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-Ling<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">petsc-users <petsc-users-bounces@mcs.anl.gov> on behalf of Zou, Ling via petsc-users <petsc-users@mcs.anl.gov><br>
<b>Date: </b>Monday, January 10, 2022 at 9:23 PM<br>
<b>To: </b>Barry Smith <bsmith@petsc.dev><br>
<b>Cc: </b>PETSc <petsc-users@mcs.anl.gov><br>
<b>Subject: </b>Re: [petsc-users] A problem with MatFDColoringSetFunction<o:p></o:p></span></p>
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<p class="MsoNormal">Thank you Barry.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-Ling</p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Barry Smith <bsmith@petsc.dev><br>
<b>Date: </b>Monday, January 10, 2022 at 5:13 PM<br>
<b>To: </b>Zou, Ling <lzou@anl.gov><br>
<b>Cc: </b>PETSc <petsc-users@mcs.anl.gov><br>
<b>Subject: </b>Re: [petsc-users] A problem with MatFDColoringSetFunction<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> This is annoying. You need to pass in a compiler flag to turn off the error conditioner for casting a function pointer. It may be -Wnoerror=cast-function-type just google.</p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> Barry</p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal">On Jan 10, 2022, at 4:35 PM, Zou, Ling via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</a>> wrote:</p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi All,<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"> <span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal">I would appreciate if you could give some advice for setting the ‘FormFunction’ for the MatFDColoringSetFunction function call.<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal">I follow what is shown in the example:<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><a href="https://petsc.org/release/src/snes/tutorials/ex14.c.html"><span style="color:#0563C1">https://petsc.org/release/src/snes/tutorials/ex14.c.html</span></a><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"> <span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal">I setup similar code structure like:<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal">PetscErrorCode FormFunction(SNES,Vec,Vec,void*);<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal">Then use it as:<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal">MatFDColoringSetFunction(fdcoloring, (PetscErrorCode(*)(void))SNESFormFunction, this);<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"> <span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal">This works fine on my local MacOS. However, when commit it to a remote repo, the compiler there gives me the following error (where warnings are treated as errors):<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"> <span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal">src/base/PETScProblemInterface.C:100:67: error:<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal">cast between incompatible function types from<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal">'PetscErrorCode (*)(SNES, Vec, Vec, void*)' {aka 'int (*)(_p_SNES*, _p_Vec*, _p_Vec*, void*)'}<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal">to<span class="apple-converted-space"> </span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal">'PetscErrorCode (*)()' {aka 'int (*)()'} [-Werror=cast-function-type]<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"> <span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal">Any help is appreciated.<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"> <span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal">-Ling<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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