[petsc-users] compiling PETSc using c++ compiler

[Sam Guo]

Dear PETSc dev team,
  When I compile PETSc using
--with-cc=gcc --with-cxx=g++ --with-clanguage=cxx,
I got following error:
../../../petsc/src/sys/objects/pinit.c: In function ‘PetscInitialize’:
../../../petsc/src/sys/objects/pinit.c:913:21: error: expected declaration
specifiers or ‘...’ before numeric constant
  913 |     PetscComplex ic(0.0,1.0);
      |                     ^~~
../../../petsc/src/sys/objects/pinit.c:913:25: error: expected declaration
specifiers or ‘...’ before numeric constant
  913 |     PetscComplex ic(0.0,1.0);
      |                         ^~~
../../../petsc/src/sys/objects/pinit.c:914:15: error: ‘ic’ undeclared
(first use in this function)
  914 |     PETSC_i = ic;
      |               ^~
../../../petsc/src/sys/objects/pinit.c:914:15: note: each undeclared
identifier is reported only once for each function it appears in

 Thanks,
Sam
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