becker33 f962aba6ce Allow packages to control handling of compiler flags (#4421) ... * Initial work on flag trapping using functions called <flag>_handler and default_flag_handler * Update packages so they do not obliterate flags * Added append to EnvironmentModifications class * changed EnvironmentModifications to have append_flags method * changed flag_val to be a tuple * Increased test coverage * added documentation of flag handling		2017-07-19 20:12:00 -07:00
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spack	Allow packages to control handling of compiler flags (#4421)	2017-07-19 20:12:00 -07:00