Barry, this is a side-effect of your Swift experiment. Does that need to be in a header (even if it's a private header)?
The issue may be that you test with a C compiler and it gets included in C++ source. Fande Kong <fdkong...@gmail.com> writes: > Hi All, > > We (moose team) hit an error message when compiling PETSc, recently. The > error is related to "PETSC_HAVE_CLOSURE." Everything runs well if I am > going to turn this flag off by making the following changes: > > > git diff > diff --git a/config/BuildSystem/config/utilities/closure.py > b/config/BuildSystem/config/utilities/closure.py > index 6341ddf271..930e5b3b1b 100644 > --- a/config/BuildSystem/config/utilities/closure.py > +++ b/config/BuildSystem/config/utilities/closure.py > @@ -19,8 +19,8 @@ class Configure(config.base.Configure): > includes = '#include <stdio.h>\n' > body = 'int (^closure)(int);' > self.pushLanguage('C') > - if self.checkLink(includes, body): > - self.addDefine('HAVE_CLOSURE','1') > +# if self.checkLink(includes, body): > +# self.addDefine('HAVE_CLOSURE','1') > def configure(self): > self.executeTest(self.configureClosure) > > > I was wondering if there exists a configuration option to disable "Closure" > C syntax? I did not find one by running "configuration --help" > > Please let me know if you need more information. > > > Thanks, > > Fande, > > > In file included from > /Users/milljm/projects/moose/scripts/../libmesh/src/solvers/petscdmlibmesh.C:25: > /Users/milljm/projects/moose/petsc/include/petsc/private/petscimpl.h:15:29: > warning: 'PetscVFPrintfSetClosure' initialized and declared 'extern' > 15 | PETSC_EXTERN PetscErrorCode PetscVFPrintfSetClosure(int (^)(const > char*)); > | ^~~~~~~~~~~~~~~~~~~~~~~ > /Users/milljm/projects/moose/petsc/include/petsc/private/petscimpl.h:15:53: > error: expected primary-expression before 'int' > 15 | PETSC_EXTERN PetscErrorCode PetscVFPrintfSetClosure(int (^)(const > char*)); > | ^~~ > CXX src/systems/libmesh_opt_la-equation_systems_io.lo > In file included from > /Users/milljm/projects/moose/petsc/include/petsc/private/dmimpl.h:7, > from > /Users/milljm/projects/moose/scripts/../libmesh/src/solvers/petscdmlibmeshimpl.C:26: > /Users/milljm/projects/moose/petsc/include/petsc/private/petscimpl.h:15:29: > warning: 'PetscVFPrintfSetClosure' initialized and declared 'extern' > 15 | PETSC_EXTERN PetscErrorCode PetscVFPrintfSetClosure(int (^)(const > char*)); > | ^~~~~~~~~~~~~~~~~~~~~~~ > /Users/milljm/projects/moose/petsc/include/petsc/private/petscimpl.h:15:53: > error: expected primary-expression before 'int' > 15 | PETSC_EXTERN PetscErrorCode PetscVFPrintfSetClosure(int (^)(const > char*));