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11.12 Exit Status of make -k

Do not rely on the exit status of make -k. Some implementations reflect whether they encountered an error in their exit status; other implementations always succeed.

     $ cat Makefile
     all:
             false
     $ make -k; echo exit status: $?    # GNU make
     false
     make: *** [all] Error 1
     exit status: 2
     $ pmake -k; echo exit status: $?   # BSD make
     false
     *** Error code 1 (continuing)
     exit status: 0