opal/accelerator: Remove function table and dlopen logic

config/opal_check_cuda.m4

@@ -27,7 +27,22 @@ dnl
 dnl $HEADER$
 dnl
 
+
+# OPAL_CHECK_CUDA(prefix, [action-if-found], [action-if-not-found])
+# --------------------------------------------------------
+# check if CUDA support can be found.  sets prefix_{CPPFLAGS,
+# LDFLAGS, LIBS} as needed and runs action-if-found if there is
+# support, otherwise executes action-if-not-found
+
+#
+# Check for CUDA support
+#
 AC_DEFUN([OPAL_CHECK_CUDA],[
+OPAL_VAR_SCOPE_PUSH([cuda_save_CPPFLAGS cuda_save_LDFLAGS cuda_save_LIBS])
+
+cuda_save_CPPFLAGS="$CPPFLAGS"
+cuda_save_LDFLAGS="$LDFLAGS"
+cuda_save_LIBS="$LIBS"
 #
 # Check to see if user wants CUDA support
 #
@@ -72,12 +87,15 @@ AS_IF([test "$with_cuda" = "no" || test "x$with_cuda" = "x"],
                             opal_cuda_incdir="$with_cuda/include"
                             AC_MSG_RESULT([found ($opal_cuda_incdir/cuda.h)])])])])])
 
-dnl We cannot have CUDA support without dlopen support.  HOWEVER, at
-dnl this point in configure, we can't know whether the DL framework
-dnl has been configured or not yet (it likely hasn't, since CUDA is a
-dnl common framework, and likely configured first).  So we have to
-dnl defer this check until later (see the OPAL_CHECK_CUDA_AFTER_OPAL_DL m4
-dnl macro, below).  :-(
+AS_IF([test "$opal_check_cuda_happy" = "yes"],
+    [OAC_CHECK_PACKAGE([cuda],
+                       [$1],
+                       [cuda.h],
+                       [cuda],
+                       [cuMemFree],
+                       [opal_check_cuda_happy="yes"],
+                       [opal_check_cuda_happy="no"])],
+    [])
 
 # We require CUDA IPC support which started in CUDA 4.1. Error
 # out if the support is not there.
@@ -144,22 +162,9 @@ AM_CONDITIONAL([OPAL_cuda_gdr_support], [test "x$CUDA_VERSION_60_OR_GREATER" = "
 AC_DEFINE_UNQUOTED([OPAL_CUDA_GDR_SUPPORT],$CUDA_VERSION_60_OR_GREATER,
                    [Whether we have CUDA GDR support available])
 
+CPPFLAGS=${cuda_save_CPPFLAGS}
+LDFLAGS=${cuda_save_LDFLAGS}
+LIBS=${cuda_save_LIBS}
+OPAL_VAR_SCOPE_POP
 ])
 
-dnl
-dnl CUDA support requires DL support (it dynamically opens the CUDA
-dnl library at run time).  But we do not check for OPAL DL support
-dnl until lafter the initial OPAL_CHECK_CUDA is called.  So put the
-dnl CUDA+DL check in a separate macro that can be called after the DL MCA
-dnl framework checks in the top-level configure.ac.
-dnl
-AC_DEFUN([OPAL_CHECK_CUDA_AFTER_OPAL_DL],[
-
-    # We cannot have CUDA support without OPAL DL support.  Error out
-    # if the user wants CUDA but we do not have OPAL DL support.
-    AS_IF([test $OPAL_HAVE_DL_SUPPORT -eq 0 && \
-           test "$opal_check_cuda_happy" = "yes"],
-          [AC_MSG_WARN([--with-cuda was specified, but dlopen support is disabled.])
-           AC_MSG_WARN([You must reconfigure Open MPI with dlopen ("dl") support.])
-           AC_MSG_ERROR([Cannot continue.])])
-])

config/opal_config_files.m4

@@ -17,7 +17,6 @@
 AC_DEFUN([OPAL_CONFIG_FILES],[
     AC_CONFIG_FILES([
         opal/Makefile
-        opal/cuda/Makefile
         opal/etc/Makefile
         opal/include/Makefile
         opal/datatype/Makefile

configure.ac

@@ -987,7 +987,6 @@ AC_CACHE_SAVE
 
 opal_show_title "System-specific tests"
 
-OPAL_CHECK_CUDA
 ##################################
 OPAL_CHECK_OS_FLAVORS
 
@@ -1233,8 +1232,6 @@ AC_CACHE_SAVE
 # be done better by having some kind of "run this check at the end of
 # all other MCA checks" hook...?
 
-OPAL_CHECK_CUDA_AFTER_OPAL_DL
-
 OPAL_CHECK_ROCM_AFTER_OPAL_DL
 
 ##################################

opal/Makefile.am

@@ -22,26 +22,18 @@
 # $HEADER$
 #
 
-if OPAL_cuda_support
-LIBOPAL_GPU_SUBDIR = cuda
-LIBOPAL_GPU_LA = cuda/libopalcuda.la
-endif
-
-
 SUBDIRS = \
 	include \
         datatype \
         etc \
         util \
 	mca/base \
-	$(LIBOPAL_GPU_SUBDIR) \
 	$(MCA_opal_FRAMEWORKS_SUBDIRS) \
 	$(MCA_opal_FRAMEWORK_COMPONENT_STATIC_SUBDIRS) \
         . \
 	$(MCA_opal_FRAMEWORK_COMPONENT_DSO_SUBDIRS)
 DIST_SUBDIRS = \
 	include \
-	cuda \
         datatype \
         etc \
 	util \
@@ -67,13 +59,11 @@ lib@OPAL_LIB_NAME@_la_LIBADD = \
 	libopen-pal_core.la \
         datatype/libdatatype.la \
         util/libopalutil.la \
-	$(LIBOPAL_GPU_LA) \
 	$(MCA_opal_FRAMEWORK_LIBS)
 lib@OPAL_LIB_NAME@_la_DEPENDENCIES = \
 	libopen-pal_core.la \
         datatype/libdatatype.la \
         util/libopalutil.la \
-        $(LIBOPAL_GPU_LA)  \
         $(MCA_opal_FRAMEWORK_LIBS)
 lib@OPAL_LIB_NAME@_la_LDFLAGS = -version-info @libopen_pal_so_version@