MPI pacakge is a bit weird compared to others [as it does this funny thing with MPIUNI]. For regular packages - I guess I would use 'if package.found' I guess I should create an MR with this diff. Satish ---- diff --git a/config/BuildSystem/config/packages/p4est.py b/config/BuildSystem/config/packages/p4est.py index e7108b0ab8..40d6797f02 100644 --- a/config/BuildSystem/config/packages/p4est.py +++ b/config/BuildSystem/config/packages/p4est.py @@ -24,14 +24,16 @@ class Configure(config.package.GNUPackage): self.blasLapack = framework.require('config.packages.BlasLapack',self) self.zlib = framework.require('config.packages.zlib',self) self.memalign = framework.argDB['with-memalign'] - self.deps = [self.mpi,self.blasLapack,self.zlib] + self.deps = [self.blasLapack,self.zlib] + self.odeps = [self.mpi] return def formGNUConfigureArgs(self): args = config.package.GNUPackage.formGNUConfigureArgs(self) if self.argDB['with-p4est-debugging']: args.append('--enable-debug') - args.append('--enable-mpi') + if not self.mpi.usingMPIUni: + args.append('--enable-mpi') args.append('CPPFLAGS="'+self.headers.toStringNoDupes(self.dinclude)+'"') args.append('LIBS="'+self.libraries.toString(self.dlib)+'"') args.append('--enable-memalign='+self.memalign) On Fri, 16 Apr 2021, Isaac, Tobin G wrote:

Matt, this is the configure logic I would like, but I don't know how to do it: - configure p4est after MPI, but do not require MPI - if MPI is present, add the '--enable-mpi' flack in formGNUConfigureArgs(), otherwise omit it.

________________________________________ From: Isaac, Tobin G <[email protected]> Sent: Friday, April 16, 2021 11:03 To: Mark Adams; For users of the development version of PETSc Subject: Re: [petsc-dev] p4est w/o MPI

p4est has a mode where it can compile without MPI, I don't know if PETSc is using it, will check.

________________________________________ From: petsc-dev <[email protected]> on behalf of Mark Adams <[email protected]> Sent: Friday, April 16, 2021 10:23 To: For users of the development version of PETSc Subject: [petsc-dev] p4est w/o MPI

I don't have MPI (Fugaku w/ gcc) and p4est seems to need it. Is there a work around? Thanks, Mark