6133e34 makefiles: factor out common.mk

5 files Authored by Michael Shigorin 4 years ago, Committed by teigland 4 years ago,
    makefiles: factor out common.mk
    
    This commit started with adding the test for checking for
    -fstack-clash-protection before use (not available before
    gcc8, added with 0533006b4d36e8699ea51036d8914c22e46fae3f
    unconditionally); should help cases like the one mentioned
    in commit a904a3de2997bc7ce55b6cb3647d5ec347f0a2fa as well
    as myself with lcc/e2k.
    
    The CFLAGS specification and handling duplication didn't
    look all that well so I chose to reimplement the whole set
    of Makefiles into a proper recursive form with a shared one
    to include; should be easier to maintain overall.
    
        
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