# FreeFEM compilation error : \_\_float128 problem **URL:** \ **Category:** General Discussion\ **Created:** [October 24, 2022, 1:35pm UTC](https://community.freefem.org/t/freefem-compilation-error-float128-problem/2083 "2022-10-24T13:35:30Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![ffeppon](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/ffeppon/32/1011_2.png) [@ffeppon](https://community.freefem.org/u/ffeppon)\ **Post date:** [October 24, 2022, 1:35pm UTC](https://community.freefem.org/t/freefem-compilation-error-float128-problem/2083/1 "2022-10-24T13:35:30Z")
Dear developpers, I am encountering some difficulties to compile FreeFEM on a compute server. When I reach the compulation of mpi plugins, I have the error below… I have also seen error messages stating ```auto error: cannot convert ‘std::complex’ to ‘ __complex__ __float128’ in assignment ``` I think the compute server runs on ubuntu (I don’t have root access) and I am compiling with gcc version 7.5. Many thanks in advance for your help. Florian ```auto ./ff-petsc/r/bin/mpicxx -c -fPIC -std=gnu++17 -std=c++14 -std=c++14 '-I../seq/include' '-DWITH_slepc' '-I./ff-petsc/r/include' '-DWITH_petsc' '-I./ff-petsc/r/include' '-DWITH_blas' '-I./ff-petsc/r/include' '-I./ff-petsc/r/include' -fcommon -pthread -DNDEBUG -O3 -mmmx -mavx -std=c++14 -DBAMG_LONG_LONG -DNCHECKPTR -fPIC -I./ff-petsc/r/include 'PETSc.cpp' In file included from PETSc.cpp:4:0: PETSc-code.hpp:3008:13: warning: MATTRANSPOSEMAT macro is deprecated use MATTRANSPOSEVIRTUAL (since version 3.18) PetscStrcmp(type, MATTRANSPOSEMAT, &isType); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PETSc-code.hpp:4475:13: warning: MATTRANSPOSEMAT macro is deprecated use MATTRANSPOSEVIRTUAL (since version 3.18) PetscStrcmp(type, MATTRANSPOSEMAT, &isType); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PETSc-code.hpp:4482:13: warning: MATTRANSPOSEMAT macro is deprecated use MATTRANSPOSEVIRTUAL (since version 3.18) type = MATTRANSPOSEMAT; ^ ~~~~~~~~~~~~~~~~~~~~~~~ PETSc-code.hpp:4495:13: warning: MATTRANSPOSEMAT macro is deprecated use MATTRANSPOSEVIRTUAL (since version 3.18) PetscStrcmp(type, MATTRANSPOSEMAT, &isType); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PETSc-code.hpp: In member function ‘AnyType PETSc::setOptions::setOptions_Op::operator()(Stack) const’: PETSc-code.hpp:2422:211: error: ‘class KNM< __float128>’ has no member named ‘operator double*’; did you mean ‘operator__ float128*’? rdinates(pc, coordinates->N( ), coordinates->M( ), reinterpret_cast(coordinates->operator double*())); ^ operator 121 PETSc-code.hpp: In function ‘KN_ PETSc::Dmat_D(Dmat*)’: PETSc-code.hpp:4786:131: error: no matching function for call to ‘KN_::KN_(HPDDM::upscaled_type*, int)’ reinterpret_cast*>(const_cast(p->_A->getScaling())), p->_A->getDof()); ^ In file included from ../seq/include/AFunction.hpp:54:0, from ../seq/include/ff++.hpp:21, from common_hpddm.hpp:6, from PETSc.hpp:6, from PETSc-code.hpp:3, from PETSc.cpp:4: ../seq/include/RNM.hpp:609:3: note: candidate: KN_::KN_(const KN_&, long int, const ShapeOfArray&, long int) [with R = double] KN_(const KN_ & u,long nnext,const ShapeOfArray &sh,long startv=0) ^~~../seq/include/RNM.hpp:609:3: note: candidate expects 4 arguments, 2 provided ../seq/include/RNM.hpp:607:3: note: candidate: KN_::KN_(const KN_&, const ShapeOfArray&, long int) [with R = double] KN_(const KN_ & u,const ShapeOfArray &sh,long startv=0) ^~~../seq/include/RNM.hpp:607:3: note: no known conversion for argument 1 from ‘HPDDM::upscaled_type* {aka __float128*}’ to ‘const KN_&’ ../seq/include/RNM.hpp:606:3: note: candidate: KN_::KN_(const KN_&, long int) [with R = double] KN_(const KN_ & u,long offset) :ShapeOfArray(u),v(&u[offset]){} ^~~../seq/include/RNM.hpp:606:3: note: no known conversion for argument 1 from ‘HPDDM::upscaled_type* {aka __float128*}’ to ‘const KN_&’ ../seq/include/RNM.hpp:588:3: note: candidate: KN_::KN_(R*, long int) [with R = double] KN_(R *u,long nn):ShapeOfArray(nn),v(u){} ^~~../seq/include/RNM.hpp:588:3: note: no known conversion for argument 1 from ‘HPDDM::upscaled_type* {aka __float128*}’ to ‘double*’ ../seq/include/RNM.hpp:587:3: note: candidate: KN_::KN_(R*, long int, long int, long int) [with R = double] KN_(R *u,long nn,long s,long nextt):ShapeOfArray(nn,s,nextt),v(u){} ^~~../seq/include/RNM.hpp:587:3: note: candidate expects 4 arguments, 2 provided ../seq/include/RNM.hpp:586:3: note: candidate: KN_::KN_(R*, long int, long int) [with R = double] KN_(R *u,long nn,long s):ShapeOfArray(nn,s),v(u){} ^~~../seq/include/RNM.hpp:586:3: note: candidate expects 3 arguments, 2 provided ../seq/include/RNM.hpp:585:3: note: candidate: KN_::KN_(R*, const ShapeOfArray&) [with R = double] KN_(R *u,const ShapeOfArray & s):ShapeOfArray(s),v(u){} ^~~../seq/include/RNM.hpp:585:3: note: no known conversion for argument 1 from ‘HPDDM::upscaled_type* {aka __float128*}’ to ‘double*’ ../seq/include/RNM.hpp:409:3: note: candidate: KN_::KN_(const KN_&, const SubArray&) [with R = double] KN_(const KN_ & U,const SubArray & sa) : ShapeOfArray(U,sa),v(U.v + U.index(sa.start)) {} ^~~../seq/include/RNM.hpp:409:3: note: no known conversion for argument 1 from ‘HPDDM::upscaled_type* {aka __float128*}’ to ‘const KN_&’ ../seq/include/RNM.hpp:408:3: note: candidate: KN_::KN_(const KN_&) [with R = double] KN_(const KN_ & u) :ShapeOfArray(u),v(u.v){} ^~~../seq/include/RNM.hpp:408:3: note: candidate expects 1 argument, 2 provided In file included from common_hpddm.hpp:510:0, from PETSc.hpp:6, from PETSc-code.hpp:3, from PETSc.cpp:4: ../seq/iovtk.cpp: In function ‘Fem2D::Mesh* VTK_Load(const string&, bool, KN >*)’: ../seq/iovtk.cpp:1421:9: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp, "%s", buffer); // ASCII or BINARY ~~~~~~^~~~~~~~~~~~~~~~~~../seq/iovtk.cpp: In function ‘Fem2D::Mesh3* VTK_Load3(const string&, bool, bool, bool, double, KN >*)’: ../seq/iovtk.cpp:3195:9: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp, "%s", buffer); // ASCII or BINARY ~~~~~~^~~~~~~~~~~~~~~~~~ Makefile:657: recipe for target 'PETSc.so' failed make[3]: *** [PETSc.so] Error 1 make[3]: Leaving directory '.-recipes/FreeFem-sources/plugin/mpi' Makefile:664: recipe for target 'all-recursive' failed make[2]: *** [all-recursive] Error 1 make[2]: Leaving directory '.-recipes/FreeFem-sources/plugin' Makefile:800: recipe for target 'all-recursive' failed make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory '.-recipes/FreeFem-sources' Makefile:750: recipe for target 'all' failed make: *** [all] Error 2 ``` ---
**Author:** ![prj](https://avatars.discourse-cdn.com/v4/letter/p/ecae2f/32.png) [@prj](https://community.freefem.org/u/prj)\ **Post date:** [October 24, 2022, 1:58pm UTC](https://community.freefem.org/t/freefem-compilation-error-float128-problem/2083/2 "2022-10-24T13:58:12Z")
Which PETSc version are you using? ---
**Author:** ![prj](https://avatars.discourse-cdn.com/v4/letter/p/ecae2f/32.png) [@prj](https://community.freefem.org/u/prj)\ **Post date:** [October 24, 2022, 2:01pm UTC](https://community.freefem.org/t/freefem-compilation-error-float128-problem/2083/3 "2022-10-24T14:01:12Z")
Consider switching to FreeFEM `develop` branch and starting from scratch (including `make petsc-slepc`). ---
**Author:** ![ffeppon](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/ffeppon/32/1011_2.png) [@ffeppon](https://community.freefem.org/u/ffeppon)\ **Post date:** [October 25, 2022, 9:53am UTC](https://community.freefem.org/t/freefem-compilation-error-float128-problem/2083/4 "2022-10-25T09:53:57Z")
Hi, Ok compiling the develop branch worked. I used the last version of PETSC which I compile separately in order to also have mpich and other libraries. Thanks ! Florian