[offloading] Error on missing symbols

When compiling an OpenMP or OpenACC program containing a reference in the
offloaded code to a symbol that has not been included in the offloaded code,
the offloading compiler may ICE in lto1.

Fix this by erroring out instead, mentioning the problematic symbol:
...
error: variable 'var' has been referenced in offloaded code but hasn't
  been marked to be included in the offloaded code
lto1: fatal error: errors during merging of translation units
compilation terminated.
...

Build x86_64 with nvptx accelerator and reg-tested libgomp.

Build x86_64 and reg-tested libgomp.

2018-12-14  Tom de Vries  <tdevries@suse.de>

	* lto-cgraph.c (verify_node_partition): New function.
	(input_overwrite_node, input_varpool_node): Use verify_node_partition.

	* testsuite/libgomp.c-c++-common/function-not-offloaded-aux.c: New test.
	* testsuite/libgomp.c-c++-common/function-not-offloaded.c: New test.
	* testsuite/libgomp.c-c++-common/variable-not-offloaded.c: New test.
	* testsuite/libgomp.oacc-c-c++-common/function-not-offloaded.c: New test.
	* testsuite/libgomp.oacc-c-c++-common/variable-not-offloaded.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@267134 138bc75d-0d04-0410-961f-82ee72b054a4

5 files changed, 82 insertions, 0 deletions

diff --git a/libgomp/testsuite/libgomp.c-c++-common/function-not-offloaded-aux.c b/libgomp/testsuite/libgomp.c-c++-common/function-not-offloaded-aux.c
new file mode 100644
index 00000000000..b8aa3da48a1
--- /dev/null
+++ b/libgomp/testsuite/libgomp.c-c++-common/function-not-offloaded-aux.c
@@ -0,0 +1,12 @@
+/* { dg-skip-if "" { *-*-* } } */
+
+#pragma omp declare target
+extern int var;
+#pragma omp end declare target
+
+void __attribute__((noinline, noclone))
+foo (void)
+{
+  var++;
+}
+
diff --git a/libgomp/testsuite/libgomp.c-c++-common/function-not-offloaded.c b/libgomp/testsuite/libgomp.c-c++-common/function-not-offloaded.c
new file mode 100644
index 00000000000..9e59ef8864e
--- /dev/null
+++ b/libgomp/testsuite/libgomp.c-c++-common/function-not-offloaded.c
@@ -0,0 +1,16 @@
+/* { dg-do link } */
+/* { dg-excess-errors "unresolved symbol foo, lto1, mkoffload and lto-wrapper fatal errors" { target offload_device_nonshared_as } } */
+/* { dg-additional-sources "function-not-offloaded-aux.c" } */
+
+#pragma omp declare target
+int var;
+#pragma omp end declare target
+
+extern void foo ();
+
+int
+main ()
+{
+#pragma omp target
+  foo ();
+}
diff --git a/libgomp/testsuite/libgomp.c-c++-common/variable-not-offloaded.c b/libgomp/testsuite/libgomp.c-c++-common/variable-not-offloaded.c
new file mode 100644
index 00000000000..bc4b916e9a4
--- /dev/null
+++ b/libgomp/testsuite/libgomp.c-c++-common/variable-not-offloaded.c
@@ -0,0 +1,19 @@
+/* { dg-do link } */
+/* { dg-excess-errors "lto1, mkoffload and lto-wrapper fatal errors" { target offload_device_nonshared_as } } */
+
+int var; /* { dg-error "variable 'var' has been referenced in offloaded code but hasn't been marked to be included in the offloaded code" "" { target offload_device_nonshared_as } } */
+
+#pragma omp declare target
+void  __attribute__((noinline, noclone))
+foo (void)
+{
+  var++;
+}
+#pragma omp end declare target
+
+int
+main ()
+{
+#pragma omp target
+  foo ();
+}
diff --git a/libgomp/testsuite/libgomp.oacc-c-c++-common/function-not-offloaded.c b/libgomp/testsuite/libgomp.oacc-c-c++-common/function-not-offloaded.c
new file mode 100644
index 00000000000..c94f268462f
--- /dev/null
+++ b/libgomp/testsuite/libgomp.oacc-c-c++-common/function-not-offloaded.c
@@ -0,0 +1,18 @@
+/* { dg-do link } */
+/* { dg-excess-errors "lto1, mkoffload and lto-wrapper fatal errors" { target openacc_nvidia_accel_configured } } */
+
+int var;
+#pragma acc declare create (var)
+
+void __attribute__((noinline, noclone))
+foo () /* { dg-error "function 'foo' has been referenced in offloaded code but hasn't been marked to be included in the offloaded code" "" { target openacc_nvidia_accel_configured } } */
+{
+  var++;
+}
+
+int
+main ()
+{
+#pragma acc parallel
+  foo ();
+}
diff --git a/libgomp/testsuite/libgomp.oacc-c-c++-common/variable-not-offloaded.c b/libgomp/testsuite/libgomp.oacc-c-c++-common/variable-not-offloaded.c
new file mode 100644
index 00000000000..8e10271b97f
--- /dev/null
+++ b/libgomp/testsuite/libgomp.oacc-c-c++-common/variable-not-offloaded.c
@@ -0,0 +1,17 @@
+/* { dg-do link } */
+
+int var; /* { dg-error "'var' requires a 'declare' directive for use in a 'routine' function" } */
+
+#pragma acc routine
+void  __attribute__((noinline, noclone))
+foo (void)
+{
+  var++;
+}
+
+int
+main ()
+{
+#pragma acc parallel
+  foo ();
+}