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12.17 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