Telcon: 2016 04 28

Participants

About to merge this.
- now passing all unit tests and ready to merge
NOTE: this will change hashes on specs, so rebuilding may have to happen.
new features:
- allows cflags, cxxflags, ldlibs, cppflags, fcflags, f77flags, ldflags to be injected into compiler wrappers.
- New architecture syntax:
```
Instead of:
    spack install foo =x86_64
Now write:
    spack install foo arch=x86_64
```
  Reclaims = so that we can use it for arbitrary parameters
  - Lays foundation for general parameters to builds (i.e., not just variants but strings and maybe ints, other things)
- Variant syntax is still there, but you can use param=true or param=false too
- Spec syntax supports referring to specs by hash:
```
spack uninstall /fbatdn31
```
- Can use anonymous specs in things like spack find
```
spack find %gcc    # find everything built with gcc. Note no name.
```

builds multiple packages at the same time on-node
launch all deps in parallel (still correct -- they wait on their dependencies)
good speedup for serial parts of builds (configure)
- would need limiting of parallelism for multiple parallel builds

working on naming conventions
issues with OS not being included in the name of /opt/spack/<arch>
- fixed by newarch branch

Djay working on three things:
- Looking into handling of variants in concretization
- Say foo depends on MPI optionally.
```
This:
    spack install foo ^openmpi
says foo doesn't depend on OpenMPI and you have to say:
    spack install foo +mpi ^openmpi
```
- Djay working on resolving this
Packages that don't have numerical versions
- should use url=... in version directive
Some packages share code, have large tarballs, would be nice to cache tarball
- Scheibel's package cache PR should help
VisIt package is done and ready to be merge
Qt5 for mac is compiling on OS X
- Breaks on Linux so still working out bugs.