Re: Alternative Approach to Subdirectories issue

[Ben Pfaff]

Jan Engelhardt <address@hidden> writes:

> Makefile.am contains like:
>
>       PROGRAM1_SOURCES := src/p1/foo.c
>       PROGRAM2_SOURCES := src/p2/foo.c
>
> Then the following warning will be generated upon `autoreconf -fi`:
>
>       Makefile.am: object `foo.lo' created by 
>       `src/p1/foo.c' and `src/p2/foo.c'
>       autoreconf: automake failed with exit status: 1

It sounds like you are not using the subdir-objects option.  Here
is its documentation, from the Automake 1.10 manual:

17 Changing Automake's Behavior
*******************************

Various features of Automake can be controlled by options in the
`Makefile.am'.  Such options are applied on a per-`Makefile' basis when
listed in a special `Makefile' variable named `AUTOMAKE_OPTIONS'.  They
are applied globally to all processed `Makefiles' when listed in the
first argument of `AM_INIT_AUTOMAKE' in `configure.ac'.  Currently
understood options are: 

[...]

`subdir-objects'
     If this option is specified, then objects are placed into the
     subdirectory of the build directory corresponding to the
     subdirectory of the source file.  For instance, if the source file
     is `subdir/file.cxx', then the output file would be
     `subdir/file.o'.

     In order to use this option with C sources, you should add
     `AM_PROG_CC_C_O' to `configure.ac'.

-- 
Ben Pfaff 
http://benpfaff.org