[ET Trac] #2553: Cactus' link command uses CPPFLAGS and CXXFLAGS

[Roland Haas]

#2553: Cactus' link command uses CPPFLAGS and CXXFLAGS

 Reporter: Roland Haas
   Status: open
Milestone: 
  Version: development version
     Type: bug
 Priority: minor
Component: Cactus

Comment (by Roland Haas):

Well making LD be nvcc gives me extra trouble when compiling ExternalLibraries \(same sort of issues that come from having Cactus LIBS mean something different then autoconf’s LIBS\).

Instead I peeked at Formaline and wrote a short ExternallLibraries/CUDA thorn that adapts Cactus' link step based on the documentation by NVIDIA. The thorn is here:  [https://github.com/rhaas80/ExternalLibraries-CUDA.git](https://github.com/rhaas80/ExternalLibraries-CUDA.git) and the trick is to collect all CUDA code in a new library using nvcc \(just as NVIDIA shows\):

```
CACTUSLIBLINKLINE += -l$(CCTK_LIBNAME_PREFIX)CUDA-gpucode

CUDA-LIB = $(CCTK_LIBDIR)/$(LIBNAME_PREFIX)$(CCTK_LIBNAME_PREFIX)CUDA-gpucode$(LIBNAME_SUFFIX)

$(EXEDIR)$(DIRSEP)$(EXE): $(CUDA-LIB)

# TODO: make this depend on only the thorns that REQUIRE CUDA
# TODO: check if depending on LINKLIST would be enough
$(CUDA-LIB): $(CONFIG)/make.thornlist $(CONFIG)/cctki_version.h $(patsubst %,$(CCTK_LIBDIR)/$(LIBNAME_PREFIX)$(CCTK_LIBNAME_PREFIX)%$(LIBNAME_SUFFIX),$(notdir $(THORNS) $(CACTUSLIBS))) $(CCTK_LIBDIR)/LINKLIST
        $(CUCC) $(patsubst %,$(CCTK_LIBDIR)/$(LIBNAME_PREFIX)%$(LIBNAME_SUFFIX),$(ALLCACTUSLIBS)) -dlink -o $@
        if test "x$(USE_RANLIB)" = "xyes"; then $(RANLIB) $(RANLIBFLAGS) $@; fi
        @echo $(DIVIDER)
```

which lets me compile this thornlist:

```
ExternalLibraries/CUDA
```

and run this parfile:

```
ActiveThorns = CUDA
CUDA::test = yes
```

I think this should work, though I have not tested it on a system where `-filelist` is actually supported \(given that Linux does not, I assume nothing does anymore\), in which case maybe there are no libthornFOO.a files but only the raw object files.

--
Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2553/cactus-link-command-uses-cppflags-and
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