Refactor '-ldl' handling for libgomp proper and plugins

Instead of implicit global 'LIBS="-ldl $LIBS"' via 'AC_CHECK_LIB', make
'-ldl' explicit for libgomp proper, and clean up 'PLUGIN_GCN_LIBS',
'PLUGIN_NVPTX_LIBS' accordingly.

	libgomp/
	* Makefile.am (libgomp_la_LIBADD): Initialize.
	* plugin/configfrag.ac (DL_LIBS): New.
	(PLUGIN_GCN_LIBS): Remove.
	(PLUGIN_NVPTX_LIBS): Don't set in the 'PLUGIN_NVPTX_DYNAMIC' case.
	* plugin/Makefrag.am (libgomp_la_LIBADD)
	(libgomp_plugin_gcn_la_LIBADD): Consider '$(DL_LIBS)'.
	(libgomp_plugin_nvptx_la_LIBADD) <PLUGIN_NVPTX_DYNAMIC>: Likewise.
	* Makefile.in: Regenerate.
	* config.h.in: Likewise.
	* configure: Likewise.
	* testsuite/Makefile.in: Likewise.

7 files changed, 19 insertions, 28 deletions

diff --git a/libgomp/Makefile.am b/libgomp/Makefile.am
index f8b2a06d63e..428f7a9dab5 100644
--- a/libgomp/Makefile.am
+++ b/libgomp/Makefile.am
@@ -56,6 +56,7 @@ endif
 libgomp_version_info = -version-info $(libtool_VERSION)
 libgomp_la_LDFLAGS = $(libgomp_version_info) $(libgomp_version_script) \
         $(lt_host_flags)
+libgomp_la_LIBADD =
 libgomp_la_DEPENDENCIES = $(libgomp_version_dep)
 libgomp_la_LINK = $(LINK) $(libgomp_la_LDFLAGS)
 
diff --git a/libgomp/Makefile.in b/libgomp/Makefile.in
index 51252b89462..c47b6bd6153 100644
--- a/libgomp/Makefile.in
+++ b/libgomp/Makefile.in
@@ -125,7 +125,7 @@ target_triplet = @target@
 @PLUGIN_NVPTX_DYNAMIC_FALSE@@PLUGIN_NVPTX_TRUE@	-DPLUGIN_NVPTX_LINK_LIBCUDA
 
 # 'dlopen'ing the CUDA Driver library vs. linking it.
-@PLUGIN_NVPTX_DYNAMIC_TRUE@@PLUGIN_NVPTX_TRUE@am__append_3 = $(PLUGIN_NVPTX_LIBS)
+@PLUGIN_NVPTX_DYNAMIC_TRUE@@PLUGIN_NVPTX_TRUE@am__append_3 = $(DL_LIBS)
 @PLUGIN_NVPTX_DYNAMIC_FALSE@@PLUGIN_NVPTX_TRUE@am__append_4 = $(PLUGIN_NVPTX_LIBS)
 @PLUGIN_GCN_TRUE@am__append_5 = libgomp-plugin-gcn.la
 @USE_FORTRAN_TRUE@am__append_6 = openacc.f90
@@ -219,7 +219,6 @@ libgomp_plugin_nvptx_la_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC \
 	$(libgomp_plugin_nvptx_la_LDFLAGS) $(LDFLAGS) -o $@
 @PLUGIN_NVPTX_TRUE@am_libgomp_plugin_nvptx_la_rpath = -rpath \
 @PLUGIN_NVPTX_TRUE@	$(toolexeclibdir)
-libgomp_la_LIBADD =
 @USE_FORTRAN_TRUE@am__objects_1 = openacc.lo
 am_libgomp_la_OBJECTS = alloc.lo atomic.lo barrier.lo critical.lo \
 	env.lo error.lo icv.lo icv-device.lo iter.lo iter_ull.lo \
@@ -384,6 +383,7 @@ CUDA_DRIVER_LIB = @CUDA_DRIVER_LIB@
 CYGPATH_W = @CYGPATH_W@
 DEFS = @DEFS@
 DEPDIR = @DEPDIR@
+DL_LIBS = @DL_LIBS@
 DSYMUTIL = @DSYMUTIL@
 DUMPBIN = @DUMPBIN@
 ECHO_C = @ECHO_C@
@@ -441,7 +441,6 @@ PACKAGE_URL = @PACKAGE_URL@
 PACKAGE_VERSION = @PACKAGE_VERSION@
 PATH_SEPARATOR = @PATH_SEPARATOR@
 PERL = @PERL@
-PLUGIN_GCN_LIBS = @PLUGIN_GCN_LIBS@
 PLUGIN_NVPTX_CPPFLAGS = @PLUGIN_NVPTX_CPPFLAGS@
 PLUGIN_NVPTX_LDFLAGS = @PLUGIN_NVPTX_LDFLAGS@
 PLUGIN_NVPTX_LIBS = @PLUGIN_NVPTX_LIBS@
@@ -553,6 +552,7 @@ libgomp_version_info = -version-info $(libtool_VERSION)
 libgomp_la_LDFLAGS = $(libgomp_version_info) $(libgomp_version_script) \
         $(lt_host_flags)
 
+libgomp_la_LIBADD = $(DL_LIBS)
 libgomp_la_DEPENDENCIES = $(libgomp_version_dep)
 libgomp_la_LINK = $(LINK) $(libgomp_la_LDFLAGS)
 libgomp_la_SOURCES = alloc.c atomic.c barrier.c critical.c env.c \
@@ -586,7 +586,7 @@ libgomp_la_SOURCES = alloc.c atomic.c barrier.c critical.c env.c \
 @PLUGIN_GCN_TRUE@libgomp_plugin_gcn_la_LDFLAGS = $(libgomp_plugin_gcn_version_info) \
 @PLUGIN_GCN_TRUE@	$(lt_host_flags)
 
-@PLUGIN_GCN_TRUE@libgomp_plugin_gcn_la_LIBADD = libgomp.la $(PLUGIN_GCN_LIBS)
+@PLUGIN_GCN_TRUE@libgomp_plugin_gcn_la_LIBADD = libgomp.la $(DL_LIBS)
 @PLUGIN_GCN_TRUE@libgomp_plugin_gcn_la_LIBTOOLFLAGS = --tag=disable-static
 nodist_noinst_HEADERS = libgomp_f.h
 nodist_libsubinclude_HEADERS = omp.h openacc.h acc_prof.h
diff --git a/libgomp/config.h.in b/libgomp/config.h.in
index d971ea38c46..46d3eac1e61 100644
--- a/libgomp/config.h.in
+++ b/libgomp/config.h.in
@@ -51,9 +51,6 @@
 /* Define to 1 if you have the <inttypes.h> header file. */
 #undef HAVE_INTTYPES_H
 
-/* Define to 1 if you have the `dl' library (-ldl). */
-#undef HAVE_LIBDL
-
 /* Define to 1 if you have the `memalign' function. */
 #undef HAVE_MEMALIGN
 
diff --git a/libgomp/configure b/libgomp/configure
index 0df47cf96e3..66dface222e 100755
--- a/libgomp/configure
+++ b/libgomp/configure
@@ -675,12 +675,12 @@ offload_additional_lib_paths
 offload_additional_options
 offload_targets
 offload_plugins
-PLUGIN_GCN_LIBS
 PLUGIN_NVPTX_LIBS
 PLUGIN_NVPTX_LDFLAGS
 PLUGIN_NVPTX_CPPFLAGS
 CUDA_DRIVER_LIB
 CUDA_DRIVER_INCLUDE
+DL_LIBS
 libtool_VERSION
 ac_ct_FC
 FCFLAGS
@@ -15057,6 +15057,8 @@ _ACEOF
 # <http://www.gnu.org/licenses/>.
 
 plugin_support=yes
+DL_LIBS=
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for dlsym in -ldl" >&5
 $as_echo_n "checking for dlsym in -ldl... " >&6; }
 if ${ac_cv_lib_dl_dlsym+:} false; then :
@@ -15094,12 +15096,7 @@ fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_dl_dlsym" >&5
 $as_echo "$ac_cv_lib_dl_dlsym" >&6; }
 if test "x$ac_cv_lib_dl_dlsym" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBDL 1
-_ACEOF
-
-  LIBS="-ldl $LIBS"
-
+  DL_LIBS=-ldl
 else
   plugin_support=no
 fi
@@ -15221,8 +15218,6 @@ PLUGIN_NVPTX_DYNAMIC=0
 
 
 PLUGIN_GCN=0
-PLUGIN_GCN_LIBS=
-
 
 # Parse '--enable-offload-targets', figure out the corresponding libgomp
 # plugins, and configure to find the corresponding offload compilers.
@@ -15295,7 +15290,6 @@ rm -f core conftest.err conftest.$ac_objext \
 		       && (test "x$CUDA_DRIVER_LIB" = x \
 			   || test "x$CUDA_DRIVER_LIB" = xno); then
 		      PLUGIN_NVPTX=1
-		      PLUGIN_NVPTX_LIBS='-ldl'
 		      PLUGIN_NVPTX_DYNAMIC=1
 		    else
 		      PLUGIN_NVPTX=0
@@ -15321,8 +15315,6 @@ rm -f core conftest.err conftest.$ac_objext \
 		;;
 	      *)
 		tgt_plugin=gcn
-		PLUGIN_GCN=$tgt
-		PLUGIN_GCN_LIBS="-ldl"
 		PLUGIN_GCN=1
 		;;
 	      esac
diff --git a/libgomp/plugin/Makefrag.am b/libgomp/plugin/Makefrag.am
index 3eeb3419f9c..3e453ff6fee 100644
--- a/libgomp/plugin/Makefrag.am
+++ b/libgomp/plugin/Makefrag.am
@@ -26,6 +26,8 @@
 # see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 # <http://www.gnu.org/licenses/>.
 
+libgomp_la_LIBADD += $(DL_LIBS)
+
 if PLUGIN_NVPTX
 # Nvidia PTX OpenACC plugin.
 libgomp_plugin_nvptx_version_info = -version-info $(libtool_VERSION)
@@ -46,7 +48,7 @@ endif
 
 # 'dlopen'ing the CUDA Driver library vs. linking it.
 if PLUGIN_NVPTX_DYNAMIC
-libgomp_plugin_nvptx_la_LIBADD += $(PLUGIN_NVPTX_LIBS)
+libgomp_plugin_nvptx_la_LIBADD += $(DL_LIBS)
 else
 libgomp_plugin_nvptx_la_CPPFLAGS += -DPLUGIN_NVPTX_LINK_LIBCUDA
 libgomp_plugin_nvptx_la_LIBADD += $(PLUGIN_NVPTX_LIBS)
@@ -62,6 +64,8 @@ libgomp_plugin_gcn_la_CPPFLAGS = $(AM_CPPFLAGS) \
 	-D_GNU_SOURCE
 libgomp_plugin_gcn_la_LDFLAGS = $(libgomp_plugin_gcn_version_info) \
 	$(lt_host_flags)
-libgomp_plugin_gcn_la_LIBADD = libgomp.la $(PLUGIN_GCN_LIBS)
+libgomp_plugin_gcn_la_LIBADD = libgomp.la
 libgomp_plugin_gcn_la_LIBTOOLFLAGS = --tag=disable-static
+
+libgomp_plugin_gcn_la_LIBADD += $(DL_LIBS)
 endif
diff --git a/libgomp/plugin/configfrag.ac b/libgomp/plugin/configfrag.ac
index c16224104e3..14203048bdb 100644
--- a/libgomp/plugin/configfrag.ac
+++ b/libgomp/plugin/configfrag.ac
@@ -27,7 +27,9 @@
 # <http://www.gnu.org/licenses/>.
 
 plugin_support=yes
-AC_CHECK_LIB(dl, dlsym, , [plugin_support=no])
+DL_LIBS=
+AC_SUBST(DL_LIBS)
+AC_CHECK_LIB(dl, dlsym, [DL_LIBS=-ldl], [plugin_support=no])
 if test x"$plugin_support" = xyes; then
   AC_DEFINE(PLUGIN_SUPPORT, 1,
     [Define if all infrastructure, needed for plugins, is supported.])
@@ -91,8 +93,6 @@ AC_SUBST(PLUGIN_NVPTX_LDFLAGS)
 AC_SUBST(PLUGIN_NVPTX_LIBS)
 
 PLUGIN_GCN=0
-PLUGIN_GCN_LIBS=
-AC_SUBST(PLUGIN_GCN_LIBS)
 
 # Parse '--enable-offload-targets', figure out the corresponding libgomp
 # plugins, and configure to find the corresponding offload compilers.
@@ -154,7 +154,6 @@ if test x"$enable_offload_targets" != x; then
 		       && (test "x$CUDA_DRIVER_LIB" = x \
 			   || test "x$CUDA_DRIVER_LIB" = xno); then
 		      PLUGIN_NVPTX=1
-		      PLUGIN_NVPTX_LIBS='-ldl'
 		      PLUGIN_NVPTX_DYNAMIC=1
 		    else
 		      PLUGIN_NVPTX=0
@@ -180,8 +179,6 @@ if test x"$enable_offload_targets" != x; then
 		;;
 	      *)
 		tgt_plugin=gcn
-		PLUGIN_GCN=$tgt
-		PLUGIN_GCN_LIBS="-ldl"
 		PLUGIN_GCN=1
 		;;
 	      esac
diff --git a/libgomp/testsuite/Makefile.in b/libgomp/testsuite/Makefile.in
index 2d1bf8f20d7..048844f0a40 100644
--- a/libgomp/testsuite/Makefile.in
+++ b/libgomp/testsuite/Makefile.in
@@ -152,6 +152,7 @@ CUDA_DRIVER_LIB = @CUDA_DRIVER_LIB@
 CYGPATH_W = @CYGPATH_W@
 DEFS = @DEFS@
 DEPDIR = @DEPDIR@
+DL_LIBS = @DL_LIBS@
 DSYMUTIL = @DSYMUTIL@
 DUMPBIN = @DUMPBIN@
 ECHO_C = @ECHO_C@
@@ -209,7 +210,6 @@ PACKAGE_URL = @PACKAGE_URL@
 PACKAGE_VERSION = @PACKAGE_VERSION@
 PATH_SEPARATOR = @PATH_SEPARATOR@
 PERL = @PERL@
-PLUGIN_GCN_LIBS = @PLUGIN_GCN_LIBS@
 PLUGIN_NVPTX_CPPFLAGS = @PLUGIN_NVPTX_CPPFLAGS@
 PLUGIN_NVPTX_LDFLAGS = @PLUGIN_NVPTX_LDFLAGS@
 PLUGIN_NVPTX_LIBS = @PLUGIN_NVPTX_LIBS@