configure.ac: enable automake's subdir-objects option

From [1]:

    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. See
        Program and Library Variables.

This will allow reducing the number of Makefiles, but placing rules in
Makefiles in parent directories, instead of having Makefiles in every
single directory with something that needs to be built.

[1] https://www.gnu.org/software/automake/manual/html_node/List-of-Automake-options.html

Change-Id: Ic0c6ee5d809dee6b9e560239abd15408b28d9695
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/configure.ac b/configure.ac
index b6309378c85e64b0a5c9b55274b9b10fbd709f4f..b360f09845c0508c8a30226dcef8427a8a06d704 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -9,7 +9,7 @@ AC_CONFIG_MACRO_DIR([m4])
 AC_CANONICAL_TARGET
 AC_CANONICAL_HOST
 
-AM_INIT_AUTOMAKE([1.12 foreign dist-bzip2 no-dist-gzip tar-pax nostdinc])
+AM_INIT_AUTOMAKE([1.12 foreign dist-bzip2 no-dist-gzip tar-pax nostdinc subdir-objects])
 AM_MAINTAINER_MODE([enable])
 
 # Enable silent rules if available (Introduced in AM 1.11)