make -k Status (Automake and Autoconf Reference Manual)

C.2.17 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

C.2.17 Exit Status of make -k

C.2.17 Exit Status of `make -k`