makefilebsdmake

How to express basic gmake pattern rule in bmake?

I'm trying to emulate this rule with bmake

%.o: %.c
    echo $< $@

This is valid in GNU make but I'm having a hard time to replicate it with BSD make.

Thanks in advance!

Solution

  • Somewhat out of my depth here, but I think there are two things to change:

    1. Use suffix rules instead of (unsupported, GNU Make feature) pattern rules.
    2. Use the bmake names for automatic variables (bmake supports GNU Make automatic variables but are not recommended)
    .SUFFIXES: .o
.c.o:
    echo ${.TARGET} ${.IMPSRC}

    From netbsd wiki

    BSD make (aka bmake) uses traditional suffix rules (.c.o: ...) instead of pattern rules like gmake's (%.c:%.o: ...) which are more general and flexible.

    See also https://linux.die.net/man/1/bmake