variable expansion in spack.yaml not working properly

[jdomke]

using configs/RCCS-Fugaku-Fujitsu-A64FX-TofuD/spack.yaml:

spack:
  packages:
    default-compiler:
      spack_spec: {default_comp} {sys_arch}
    default-mpi:
      spack_spec: fujitsu-mpi@{fj_comp_version}%{default_comp} {sys_arch}

default_comp is defined as '[email protected]'

it worked for spack_spec: fujitsu-mpi@{fj_comp_version}%{default_comp} {sys_arch}

but for spack_spec: {default_comp} {sys_arch} i'm getting the following error during ramble ... setup

==> Error: Error parsing yaml  in "/vol0005/mdt3/data/ra000020/u10016/benchpark.llvm/configs/RCCS-Fugaku-Fujitsu-A64FX-TofuD/spack.yaml", line 9, column 7: expected <block end>, but found '{'

[scheibelp]

Can you try using quotes:

spack_spec: "{default_comp} {sys_arch}"

I think the YAML parser is having trouble with {} in this case

[jdomke]

@scheibelp yes, that workaround avoids the above error

[scheibelp]

This is a YAML issue, so not addressable by Spack/Ramble/Benchpark. Closing. Arguably re-open-able if one thinks a better error message would be ideal.