[petsc-dev] ARG_MAX and linking

[Satish Balay]

gmakefile has:

# implies shared libraries with MS compilers
ifeq ($(SL_LINKER_FUNCTION),-LD)
$(OBJDIR)/%.o : CCPPFLAGS+=-Dpetsc_EXPORTS
endif


Sure - the comment is misleading - it could be updated to say 'gmakefile' instead of 'CMake'

Satish

On Tue, 6 Feb 2018, Jed Brown wrote:

> If it's a __declspec(dllexport) issue, it's probably just not being
> handled correctly in petscsys.h.  Actually, it could be this junk which
> much be obsolete because we don't use CMake to build PETSc and also
> don't define petsc_EXPORTS.
> 
> include/petscsys.h-#if defined(petsc_EXPORTS)      /* CMake defines this when building the shared library */
> include/petscsys.h:#  define PETSC_VISIBILITY_PUBLIC PETSC_DLLEXPORT
> include/petscsys.h-#else  /* Win32 users need this to import symbols from petsc.dll */                                                                                                        
> include/petscsys.h-#  define PETSC_VISIBILITY_PUBLIC PETSC_DLLIMPORT                                                                                                                          
> include/petscsys.h-#endif                                                            
> 
> Pierre Jolivet <pierre.jolivet at enseeiht.fr> writes:
> 
> > I’m on master.
> > Thanks, I think this is the way to go, though I’m now seeing a lot of undefined references, like there http://mingw-users.1079350.n2.nabble.com/imp-prefixes-when-linking-td7386007.html <http://mingw-users.1079350.n2.nabble.com/imp-prefixes-when-linking-td7386007.html>
> >
> >> On 6 Feb 2018, at 2:05 PM, Jed Brown <jed at jedbrown.org> wrote:
> >> 
> >> What branch are you on?  I wonder if this is exacerbated by Scott's
> >> "absolute path".  You can configure --with-single-library=0 which will
> >> link a separate libpetscsys, libpetscvec, etc.
> >> 
> >> There are Cygwin recipes in gmakefile that create argument files that
> >> the linker reads as @args.  We could use $(file > args, $^) to write
> >> them with arbitrarily long command lines.
> >> 
> >> Pierre Jolivet <pierre.jolivet at enseeiht.fr> writes:
> >> 
> >>> Hello,
> >>> I’m trying to compile PETSc with msys2 and MS MPI.
> >>> Everything works out almost flawlessly, except when linking. Indeed, you generate a nice line of 
> >>> $ wc /tmp/cl
> >>>    2  1234 69041 /tmp/cl
> >>> 69041 characters, but 
> >>> $ getconf.exe ARG_MAX
> >>> 32000
> >>> 
> >>> Thus, sadly, the make fails with the following error
> >>> /usr/bin/sh: /mingw64/bin/gcc: Argument list too long
> >>> 
> >>> Do you know of a work around? Anyway to link the full library as multiple smaller libraries (I think you did that for some version X.Y with X << 3, didn’t you?)?
> >>> 
> >>> Thanks,
> >>> Pierre
>