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Add and explain some more useful targets.

    1: # pkgsrc targets
    2: 
    3: It was proposed that we document _all_ pkgsrc targets,
    4: but this is unreasonable and useless.
    5: Most targets are ancilliary ones,
    6: they exist because that's how make(1) works,
    7: only few of them are useful for regular work.
    8: 
    9: The following targets may be useful to invoke from keyboard:
   10: 
   11: * "fetch" to fetch distribution file(s)
   12: * "checksum" to fetch and check distribution file(s)
   13: * "extract" to look at unmodified source
   14: * "patch" to look at initial source
   15: * "configure" to stop after configure stage
   16: * "all" or "build" to stop after build stage
   17: * "stage-install" to install under stage directory
   18: * "test" to run package's self-tests, if any exist and supported
   19: * "package" to create binary package before installing it
   20: * "replace" to change (upgrade, downgrade, or just replace) installed package in-place
   21: * "deinstall" to deinstall previous package
   22: * "package-install" to install package and build binary package
   23: * "install" to install package
   24: * "bin-install" to attempt to skip building from source and use pre-built binary package
   25: 
   26: The following targets are useful in development and thus may be useful for an advanced user:
   27: 
   28: * "makesum" to fetch and generate checksum for distributed file(s)
   29: * "makepatchsum" to (re)generate checksum for patches
   30: * "makedistinfo" to (re)generate "distinfo" file (creating checksums for distributed file and patches)
   31: * "mps" short for "makepatchsum"
   32: * "mdi" short for "makedistinfo"
   33: 
   34: For example, package updating looks like this:
   35: <pre>
   36: rm -f distinfo && su root -c "make makesum clean" && make makepatchsum
   37: make clean && make stage-install # build
   38: # modify patches
   39: make makepatchsum # and build again, or
   40: make makepatchsum && make clean && make patch # until all patches apply, if they failed at first
   41: make print-PLIST | diff -u PLIST -
   42: # modify PLIST
   43: rm $(make show-var VARNAME=WRKDIR)/.PLIST* # this deserves to be another target
   44: make stage-install
   45: # modify PLIST again or build again
   46: make test # just to check for regressions
   47: su root -c "make package deinstall bin-install" # or
   48: su root -c "make package replace"
   49: </pre>