Re: "dynamic" makefile

[Sylvestre Ledru]

Le jeudi 30 novembre 2006 à 15:45 +0100, Ralf Wildenhues a écrit :
> * Sylvestre Ledru wrote on Thu, Nov 30, 2006 at 03:02:21PM CET:
> > 
> > I would like to generate a Makefile which will work with source files
> > provided in the command line (parameters) instead of providing them into
> > the Makefile.am.
> [...]
> > I would like to be able to produce this kind of line from a Makefile.am 
> > but instead of providing "src/hashtable_localization.c", it will use
> > parameters provided by the user. (ie $1)
> > 
> > I want to do this because I want to provide to the user of my
> > application the possibility to edit C/fortran files, compile, link and
> > load them from the application without touching configure.* or Makefile*
> 
> I don't think this is possible in general.  If the list of files the
> user can choose is a subset of a pre-defined set of source file names,
> you can stuff all of those in some EXTRA_foo_SOURCES variable.
> 
> Otherwise, all you can get is the inference rules.  I.e.,
>   make foo.o
> 
> will look for foo.c (and maybe foo.f, foo.cpp...) and if found use the
> corresponding .c.o (or .f.o, .cpp.o, ...) rule if you have enabled the
> inference rule.  (Automake outputs them as soon as you list some source
> file with that extension in a *_SOURCES variable; an EXTRA_*_SOURCES as
> above would probably come in handy again).  But this won't get you the
> benefit of dependency-tracking of included files.  And you'd still have
> to write a rule for linking (but you can just write one manually and
> make it depend upon a macro name which the user overrides).
> 
> Hope that helps.
Yep, it did help.

I worked on a solution. Some might find it perfectible (and I won't deny
it) :) 
It is a test case.

Here is the procedure :
# autoreconf (just once for the maintainer, just to create Makefile.in
and configure)
# ./configure
#  ./compile.sh mygreatlib plop.c plop.f
# make

Here is what I did :

------- Makefile.am -------
lib_LTLIBRARIES = libsciexternal.la
libsciexternal_la_SOURCES = foo.c foo2.f foo3.cxx

------- configure.ac ------- 
AC_INIT([project],[0],[url])
AM_MAINTAINER_MODE
AM_INIT_AUTOMAKE([foreign])

AC_PROG_CC
AC_PROG_CXX
AC_PROG_F77

AC_PROG_LIBTOOL
AC_CONFIG_FILES([Makefile])
AC_OUTPUT

------- compile.sh ------- 

#!/bin/sh

ORIGINALLIBNAME=libsciexternal

# Check number of parameters
if test $# -lt 2; then
        echo "Syntax : $0 libname sources"
        exit -1
fi

# retrieve parameters
LIB=$1
shift
SOURCES=$*

# Check if files exist
for file in $SOURCES; do
        if test ! -s $file; then 
                echo "Cannot find $file"
                exit -2
        fi
done

# Relaunch configure if files are missing
if test ! -s Makefile -o Makefile -ot Makefile.orig ; then 
        echo "Detection of C/C++/Fortran Compilers"
        ./configure
        mv Makefile Makefile.orig       
fi

# Replace fake filenames to the one we want 
sed -s "s|libsciexternal_la_SOURCES = foo.c foo2.f foo3.cxx|
lib"$LIB"_la_SOURCES = $SOURCES|" Makefile.orig > Makefile

##Replace  sources by .lo file
SOURCES=`echo $SOURCES|sed -s 's|\.c|\.lo|'`
SOURCES=`echo $SOURCES|sed -s 's|\.f|\.lo|'`
SOURCES=`echo $SOURCES|sed -s 's|\.cxx|\.lo|'`

### Changes objects in the source code
sed -si "s|am_libsciexternal_la_OBJECTS = foo.lo foo2.lo foo3.lo|
am_lib"$LIB"_la_OBJECTS = $SOURCES|" Makefile

### Changes objects in the source code
sed -si "s|libsciexternal|lib"$LIB"|" Makefile

-------


Comments/criticism are welcome :)

Cheers,
Sylvestre