How to make makefile host dependent?

Question

I need to compile my program with or without some libraries depending on which of the two hosts it is running. I don't know what to use at the right side of HOST= in my makefile to make this work as I want it to:

   ifeq(${HOST},${ADDITIONAL_LIBS_HOST})
   ADD_LIBS= ...   

${ADDITIONAL_LIBS_HOST} is the name of host as gotten from echo ${HOSTNAME}

Answer 1

A few thoughts:

• This is the sort of situation GNU autoconf was designed to address. Run ./configure, figure out what libraries are available, and generate an appropriate Makefile.

• You could get the current hostname by doing something like:

  HOST=$(shell hostname)
  

  You could then use this in your conditional.

• You could instead have your Makefile do something like:

  include Makefile.local
  

  And then have different Makefile.local files on each host.

Re: your comment, given a Makefile like this:

HOST=$(shell hostname)

all:
    @echo $(HOST)

Will generate the following output:

$ make all
fafnir.local

(Assuming your local host is "fafnir.local". Which mine is.)