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Hi, Based on 'cg. c', I'm trying to develop my own Krylov solver (a projected conjugate gradient). I want to integrate this into my C++ code, where I already have an interface for PETSC which works well. However, I have the following questions
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<html><body><div id="zimbraEditorContainer" style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000" class="57"><div>Hi,<br></div><div><br data-mce-bogus="1"></div><div>Based on 'cg.c', I'm trying to develop my own Krylov solver (a projected conjugate gradient). I want to integrate this into my C++ code, where I already have an interface for PETSC which works well. However, I have the following questions :<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>- Where am I sensed to put my 'cg_projected.c' and 'pcgimpl.h' files? Should they go in a directory petsc/src/ksp/ksp/impls/pcg/? If so, how do I compile that? Is it simply by adding this directory to the Makefile in petsc/src/ksp/ksp/impls/?<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>- I have also tried the basic approach of putting these two files in directories of my own C++ code and compiling. However, I have this error at the link edition:<br></div><div>[100%] Linking CXX shared library libcoeur.so<br>/usr/bin/ld: src/solvers/libsolvers.a(cg_projected.c.o): warning: relocation against `petscstack' in read-only section `.text'<br>/usr/bin/ld: src/solvers/libsolvers.a(cg_projected.c.o): relocation R_X86_64_PC32 against symbol `petscstack' can not be used when making a shared object; recompilé avec -fPIC<br>/usr/bin/ld : échec de l'édition de liens finale : bad value<br>collect2: error: ld returned 1 exit status<br>make[2]: *** [CMakeFiles/coeur.dir/build.make:121 : libcoeur.so] Erreur 1<br>make[1]: *** [CMakeFiles/Makefile2:286 : CMakeFiles/coeur.dir/all] Erreur 2<br>make: *** [Makefile:91 : all] Erreur 2<br data-mce-bogus="1"></div><div><br></div><div>Could you please tell me what is the right way to proceed?<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Thank you,<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Julien</div><div data-marker="__SIG_POST__">-- <br></div><div><div id="n" style="font-size:larger;line-height:1.4;font-weight:bolder;color:rgb(95,37,159)">Julien Bruchon </div><div id="f">Professeur IMT - Responsable du département MPE</div><div>LGF - UMR CNRS 5307 - <a href="https://urldefense.us/v3/__https://www.mines-stetienne.fr/lgf/__;!!G_uCfscf7eWS!dQgv-IRWC7OgdDf1X9Oew4nHSgleq2ty0AszuRPj70bBiFeCcT4RibQVAvv6FFeD081W1yY8IczRHAHopA0crg$" target="_blank">https://www.mines-stetienne.fr/lgf/</a><br></div><div>
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