GCN back-end config

This patch contains the configuration adjustments needed to enable the GCN
back-end.

The new configure check for dlopen is required to allow building the new
gcn-run tool.  This tool uses libdl to load the HSA runtime libraries, which
are required to run programs on the GPU.  The tool is disabled if libdl is not
available.

2019-01-17  Andrew Stubbs  <ams@codesourcery.com>
	    Kwok Cheung Yeung  <kcy@codesourcery.com>
	    Julian Brown  <julian@codesourcery.com>
	    Tom de Vries  <tom@codesourcery.com>
	    Jan Hubicka  <hubicka@ucw.cz>
	    Martin Jambor  <mjambor@suse.cz>

	* configure.ac: Likewise.
	* configure: Regenerate.
	* contrib/config-list.mk: Add amdgcn-amdhsa.

	gcc/
	* config.gcc: Add amdgcn*-*-amdhsa configuration.
	* configure.ac: Check for dlopen.
	* configure: Regenerate.


Co-Authored-By: Jan Hubicka <hubicka@ucw.cz>
Co-Authored-By: Julian Brown <julian@codesourcery.com>
Co-Authored-By: Kwok Cheung Yeung <kcy@codesourcery.com>
Co-Authored-By: Martin Jambor <mjambor@suse.cz>
Co-Authored-By: Tom de Vries <tom@codesourcery.com>

From-SVN: r268024

1 files changed, 66 insertions, 2 deletions

diff --git a/gcc/configure b/gcc/configure
index ed76a7e..d6a48ef 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -782,6 +782,7 @@ manext
 LIBICONV_DEP
 LTLIBICONV
 LIBICONV
+DL_LIB
 LDEXP_LIB
 EXTRA_GCC_LIBS
 GNAT_LIBEXC
@@ -9735,6 +9736,69 @@ LDEXP_LIB="$LIBS"
 LIBS="$save_LIBS"
 
 
+# Some systems need dlopen
+save_LIBS="$LIBS"
+LIBS=
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing dlopen" >&5
+$as_echo_n "checking for library containing dlopen... " >&6; }
+if ${ac_cv_search_dlopen+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_func_search_save_LIBS=$LIBS
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char dlopen ();
+int
+main ()
+{
+return dlopen ();
+  ;
+  return 0;
+}
+_ACEOF
+for ac_lib in '' dl; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  if ac_fn_cxx_try_link "$LINENO"; then :
+  ac_cv_search_dlopen=$ac_res
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext
+  if ${ac_cv_search_dlopen+:} false; then :
+  break
+fi
+done
+if ${ac_cv_search_dlopen+:} false; then :
+
+else
+  ac_cv_search_dlopen=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_dlopen" >&5
+$as_echo "$ac_cv_search_dlopen" >&6; }
+ac_res=$ac_cv_search_dlopen
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
+
+fi
+
+DL_LIB="$LIBS"
+LIBS="$save_LIBS"
+
+
 # Use <inttypes.h> only if it exists,
 # doesn't clash with <sys/types.h>, declares intmax_t and defines
 # PRId64
@@ -18582,7 +18646,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 18576 "configure"
+#line 18640 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -18688,7 +18752,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 18682 "configure"
+#line 18746 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H