- spack install suppresses build output by default.
- use install -v to show build output on the console too
- package.py uses log_output context to redirect output and log it to a file
- filters color codes out of output written to file
- optionally echos to the terminal
- YAML directory layout knows about its build log.
- can get path to install build log to from directory layout
- Package.install now copies the build log to $prefix/.spack/build.out
- Error message from failed install execution now includes build log location
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