[FLASH-USERS] glibc compilation error

[Reyes, Adam]

Hi Ryan,

I think your “FFLAGS_OPT” are missing a “-c”, which is why it’s complaining about the missing “main”.

The link flags can be set with the corresponding “LFLAGS_[OPT/DEBUG/TEST]” variables in your Makefile.h. 
*********************************************
Adam Reyes


Code Group Leader, Flash Center for Computational Science  
Research Scientist, Dept. of Physics and Astronomy
University of Rochester
River Campus: Bausch and Lomb Hall, 369  
500 Wilson Blvd. PO Box 270171, Rochester, NY 14627
Email adam.reyes at rochester.edu
Web https://flash.rochester.edu
 (he / him / his)


*********************************************



> On Jul 11, 2024, at 7:25 AM, Ryan Farber <rjfarber at umich.edu> wrote:
> 
> Hi FLASH folks,
> 
> I am working on a completely local build of hdf5 etc for testing purposes. That went fine on my laptop, but on the cluster I actually need to debug on* I'm running into a compilation error for FLASH.**
> 
> I'm wondering if the issue is that FLASH requires multilib(?), whereas I built gcc without multilib support (although I *think* the cluster I am one just uses 64-bit and a single architecture...).
> 
> I am considering doing a local install of glibc-2.39 and then rebuilding everything (gmp, mpfr, mpc, gcc, hwloc, libevent, pmix, prrte, openmpi, and hdf5). I do have build scripts for all of those, but I'd be a bit painful, since it takes a while to build some of those packages (particularly HDF5 but I think that's mostly in make check).
> 
> So before I do so, I'm writing to ask how I can set the LINK flags? I tried adding to LINK=.../mpif90 -nostartupfiles in Makefile.h but that didn't seem to do anything different :(
> 
> *since the issue I'm facing apparently only occurs for >1e5 core jobs (not necessarily exactly 1e5 but circa).
> 
> **/dss/dsshome1/0B/di75nuc/ToSMUC/built-openmpi-5.0.3/bin/mpif90 -fdefault-real-8 -fdefault-double-8 -O3  -DMAXBLOCKS=1000 -DNXB=8 -DNYB=8 -DNZB=1 -DN_DIM=2 Burn_interface.F90
> /usr/bin/ld: /usr/lib/../lib64/crt1.o: in function `_start':
> /home/abuild/rpmbuild/BUILD/glibc-2.31/csu/../sysdeps/x86_64/start.S:104: undefined reference to `main'
> collect2: error: ld returned 1 exit status
> make: *** [Makefile:116: Burn_interface.o] Error 1
> 
> Best wishes,
> --------
> Ryan
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> 
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