configure: new --dynamic-libengines build option

When enabled, some of the more dependency-heavy internal engines are
converted to "plugin" engines, i.e. they are built into separate object
files and are loaded by fio on demand.
This helps downstream distros package these engines separately and not
force a long list of package dependencies from the base fio package.

Signed-off-by: Yigal Korman <ykorman@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 8 insertions, 0 deletions

diff --git a/configure b/configure
index 5d475bf3..0e8c27b1 100755
--- a/configure
+++ b/configure
@@ -151,6 +151,7 @@ march_set="no"
 libiscsi="no"
 libnbd="no"
 libaio_uring="no"
+dynamic_engines="no"
 prefix=/usr/local
 
 # parse options
@@ -215,6 +216,8 @@ for opt do
   ;;
   --enable-libaio-uring) libaio_uring="yes"
   ;;
+  --dynamic-libengines) dynamic_engines="yes"
+  ;;
   --help)
     show_help="yes"
     ;;
@@ -254,6 +257,7 @@ if test "$show_help" = "yes" ; then
   echo "--enable-libnbd         Enable libnbd (NBD engine) support"
   echo "--disable-tcmalloc	Disable tcmalloc support"
   echo "--enable-libaio-uring   Enable libaio emulated over io_uring"
+  echo "--dynamic-libengines	Lib-based ioengines as dynamic libraries"
   exit $exit_val
 fi
 
@@ -2954,6 +2958,10 @@ if test "$libnbd" = "yes" ; then
   echo "LIBNBD_CFLAGS=$libnbd_cflags" >> $config_host_mak
   echo "LIBNBD_LIBS=$libnbd_libs" >> $config_host_mak
 fi
+if test "$dynamic_engines" = "yes" ; then
+	output_sym "CONFIG_DYNAMIC_ENGINES"
+fi
+print_config "Lib-based ioengines dynamic" "$dynamic_engines"
 cat > $TMPC << EOF
 int main(int argc, char **argv)
 {