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cross-compiling, RPATH, and DESTDIR vs. AC_ARG_WITH


From: Ray Lehtiniemi
Subject: cross-compiling, RPATH, and DESTDIR vs. AC_ARG_WITH
Date: Tue, 11 Jan 2005 12:52:47 -0700
User-agent: Mutt/1.5.6i

greeting

i am having difficulty with my cross-development setup.  i am
using:

  crosstool-0.28-rc37 (i686-linux targetting arm-linux)
  automake (GNU automake) 1.8.3
  autoconf (GNU Autoconf) 2.59
  ltmain.sh (GNU libtool) 1.5.2 (1.1220.2.60 2004/01/25 12:25:08)

and i use:

  DESTDIR=/tmp/XXX
  PREFIX=/home/foo


if i build a lib_LTLIBRARIES target (libprog1.la) in a package
(prog1) and install it into DESTDIR, it seems that i cannot use
that .la file to (properly) create a bin_PROGRAMS target (prog2)
in a second package (also called prog2).


the prog2 package has this scrap of m4 in the configure.ac:

   AC_ARG_WITH([prog1],
            AS_HELP_STRING([--with-prog1],
                           [use a particular prog1 tree]),
            [ac_cv_use_prog1=$withval],
            [ac_cv_use_prog1=.])

   AC_SUBST(PROG1_DIR, $ac_cv_use_prog1)

and this Makefile.am:

  bin_PROGRAMS = prog2
  prog2_SOURCES = prog2.c
  prog2_CPPFLAGS = -I$(PROG1_DIR)/include
  prog2_LDFLAGS = $(PROG1_DIR)/lib/libprog1.la


if i then configure the prog2 package with '--with-prog1=${DESTDIR}/${PREFIX}',
the build works, and my executable gets installed into $DESTDIR/bin.

however, the final executable has this:

  # armv5b-softfloat-linux-objdump -p /tmp/XXX/home/foo/bin/prog2

  Dynamic Section:
    NEEDED      libprog1.so.0
    NEEDED      libc.so.6
    RPATH       /tmp/XXX//home/foo/lib


it seems to me that this RPATH entry in the final executable should
be "RPATH /home/foo/lib", no?  how do i get rid of the DESTDIR in my
RPATH?  how do i tell configure that libprog1.la just happens to be
sitting in DESTDIR at the moment, so build against PREFIX, not
DESTDIR/PREFIX?


please cc, as i'm not subscribed, thanks.

-- 
----------------------------------------------------------------------
     Ray L   <address@hidden>




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