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Makefile conditional compilation giving error

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# 1  
Old 02-27-2009
Makefile conditional compilation giving error
Hi ,
Please answer my query:
I want to create a common make file for one of mylibrary such that it should work on both Sun as well as Linux on 32 and 64 bit system.
The flow is sth like this:

..............
..............
if$(OS) == solaris
BINDIR= ../../lib/solaris/64
else
BINDIR= ../../lib/solaris/32
endif
.................
.................

But the above line throwing an error in line 3 as "Makefile, line 18: Unexpected end of line seen"
I tried hard but to no avail.
Please guide me where i am incorrect.
Moreover i will extend this conditional compilation to sth like this:
if$(OS) == solaris and machine== 64
BINDIR= ../../lib/solaris/64
elseif $(OS) == solaris and machine== 32
BINDIR= ../../lib/solaris/32
if$(OS) == linux and machine== 64
BINDIR= ../../lib/linux/64
elseif $(OS) == linux and machine== 32
BINDIR= ../../lib/linux/32
endif

Waiting for someone reply !!

/regards,
Suraj
# 2  
Old 02-28-2009
Hi.

GNU make can handle Makefiles like:
Code:
# Sat Feb 28 17:09:10 CST 2009

main: sub
        @echo " BINDIR is $(BINDIR)"

sub:
ifndef OS
        @echo " Error, OS not defined."
        @exit 1
endif

ifeq "$(OS)" "solaris"
BINDIR := ../../lib/solaris/64
else
BINDIR := ../../lib/solaris/32
endif

# if$(OS) == solaris
# BINDIR= ../../lib/solaris/64
# else
# BINDIR= ../../lib/solaris/32
# endif

When make is used as in this script:
Code:
#!/usr/bin/env bash

# @(#) s1       Demonstrate GNU make test features.

echo
set +o nounset
LC_ALL=C ; LANG=C ; export LC_ALL LANG
echo "Environment: LC_ALL = $LC_ALL, LANG = $LANG"
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version "=o" $(_eat $0 $1) make
set -o nounset

echo
echo " OS not defined:"
make

echo
echo " OS set to solaris:"
make OS=solaris

echo
echo " OS set to linux:"
make OS=linux

exit 0

produces:
Code:
% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.11-x1, i686
Distribution        : Xandros Desktop 3.0.3 Business
GNU bash 2.05b.0
GNU Make 3.80

 OS not defined:
 Error, OS not defined.
make: *** [sub] Error 1

 OS set to solaris:
 BINDIR is ../../lib/solaris/64

 OS set to linux:
 BINDIR is ../../lib/solaris/32

I tried this on Solaris 10, without much hope, and I got the same error message you did.

In order to process this kind of Makefile on Solaris, you would need GNU make.

The topic of make and makefiles is complex, so perhaps the guidance below will be of some value.

Best wishes ... cheers, drl
Quote:
Title: Managing Projects with GNU Make
Author: R Mecklenburg
Edition: 3rd
Date: 2004
Publisher: O'Reilly
ISBN: 0-596-00610-1
Pages: 280
Categories: *nix, development, compiling, building, programming, tools
Comments: Visit O'Reilly Media - Spreading the knowledge of technology innovators to get the
Comments: corrections for a large number of errors.
Comments: GNU manual: GNU `make'
Comments: Google "linux tutorial make makefile"
Comments: Conflicting opinions amazon.com; 3.5 stars, 12 reviews, 2009.02.
Comments: see also cons, scons
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