build: Default to building MCA components in the library

Default to building MCA components into the library, rather than
as dso objects, since most users are not taking advantage of
per-library packaging, and this results in less stat/open/etc. calls
during application startup.

Clean up the static/dso selection logic for componets at the same time.
Before, it was relatively hard to describe what would happen if
there was a mix of --enable-mca-dso and --enable-mca-static arguments.
Now, the code will first look for a component-specific argument, then
a framework-level argument, then a global argument.  If there is a tie,
static is preferred.

Signed-off-by: Brian Barrett <bbarrett@amazon.com>

config/opal_mca.m4

@@ -68,16 +68,16 @@ AC_DEFUN([OPAL_MCA],[
                         type-component pairs that will be built as
                         run-time loadable components (as opposed to
                         statically linked in), if supported on this
-                        platform.  The default is to build all components
-                        as DSOs.]))
+                        platform.]))
     AC_ARG_ENABLE(mca-static,
         AC_HELP_STRING([--enable-mca-static=LIST],
                        [Comma-separated list of types and/or
                         type-component pairs that will be built statically
                         linked into the library.  The default (if DSOs are
                         supported) is to build all components as DSOs.
                         Enabling a component as static disables it
-                        building as a DSO.]))
+                        building as a DSO.  The default is to build all
+                        components staticly.]))
     AC_ARG_ENABLE(mca-direct,
         AC_HELP_STRING([--enable-mca-direct=LIST],
                        [Comma-separated list of type-component pairs that
@@ -166,15 +166,21 @@ AC_DEFUN([OPAL_MCA],[
     # resolution (prefer static) is done in the big loop below
     #
     AC_MSG_CHECKING([which components should be run-time loadable])
-    if test "$enable_static" != "no" || test "$OPAL_ENABLE_DLOPEN_SUPPORT" = 0; then
+    if test "$enable_static" != "no"; then
         DSO_all=0
-        msg=none
-    elif test -z "$enable_mca_dso" || test "$enable_mca_dso" = "yes"; then
-        DSO_all=1
-        msg=all
+        msg="none (static libraries built)"
+    elif test "$OPAL_ENABLE_DLOPEN_SUPPORT" = 0; then
+        DSO_all=0
+        msg="none (dlopen disabled)"
+    elif test -z "$enable_mca_dso"; then
+        DSO_all=0
+        msg=default
     elif test "$enable_mca_dso" = "no"; then
         DSO_all=0
         msg=none
+    elif test "$enable_mca_dso" = "yes"; then
+        DSO_all=1
+        msg=all
     else
         DSO_all=0
         ifs_save="$IFS"
@@ -195,12 +201,15 @@ AC_DEFUN([OPAL_MCA],[
     fi
 
     AC_MSG_CHECKING([which components should be static])
-    if test "$enable_mca_static" = "yes"; then
-        STATIC_all=1
-        msg=all
-    elif test -z "$enable_mca_static" || test "$enable_mca_static" = "no"; then
+    if test -z "$enable_mca_static" ; then
+        STATIC_all=0
+        msg=default
+    elif test "$enable_mca_static" = "no"; then
         STATIC_all=0
         msg=none
+    elif test "$enable_mca_static" = "yes"; then
+        STATIC_all=1
+        msg=all
     else
         STATIC_all=0
         ifs_save="$IFS"
@@ -705,17 +714,23 @@ AC_DEFUN([MCA_COMPONENT_COMPILE_MODE],[
         [str="STATIC_COMPONENT=\$STATIC_$2_$3"
          eval $str])
 
-    # Setup for either shared or static
-    if test "$STATIC_FRAMEWORK" = "1" || \
-       test "$STATIC_COMPONENT" = "1" || \
-       test "$STATIC_all" = "1" ; then
-        $4="static"
-    elif test "$SHARED_FRAMEWORK" = "1" || \
-         test "$SHARED_COMPONENT" = "1" || \
-         test "$DSO_all" = "1"; then
-        $4="dso"
+    # Look for the most specific specifier between static/dso.  If
+    # there is a tie (either neither or both specified), prefer
+    # static.
+    if test "$STATIC_COMPONENT" = "1"; then
+        $4=static
+    elif test "SHARED_COMPONENT" = "1"; then
+        $4=dso
+    elif test "$STATIC_FRAMEWORK" = "1"; then
+        $4=static
+    elif test "$SHARED_FRAMEWORK" = "1"; then
+        $4=dso
+    elif test "$STATIC_all" = "1"; then
+        $4=static
+    elif test "$DSO_all" = "1"; then
+        $4=dso
     else
-        $4="static"
+        $4=static
     fi
 
     AC_MSG_CHECKING([for MCA component $2:$3 compile mode])