[patch, libgomp] Add tests for print from offload target

[Andrew Stubbs]

Hi,

This patch adds new libgomp tests to ensure that C "printf" and Fortran 
"write" work correctly within offload kernels. Both should work for 
amdgcn, but nvptx uses the libgfortran "minimal" mode which lacks 
"write" support.

Obviously, printing from offload kernels is not recommended in 
production, but can be useful in development.

OK to commit?

Thanks

Andrew
Add tests for print from offload target.

2019-11-14  Andrew Stubbs  <a...@codesourcery.com>

	libgomp/
	* testsuite/libgomp.c/target-print-1.c: New file.
	* testsuite/libgomp.fortran/target-print-1.f90: New file.
	* testsuite/libgomp.oacc-c/print-1.c: New file.
	* testsuite/libgomp.oacc-fortran/print-1.f90: New file.

diff --git a/libgomp/testsuite/libgomp.c/target-print-1.c b/libgomp/testsuite/libgomp.c/target-print-1.c
new file mode 100644
index 00000000000..5857b875ced
--- /dev/null
+++ b/libgomp/testsuite/libgomp.c/target-print-1.c
@@ -0,0 +1,17 @@
+/* Ensure that printf on the offload device works.  */
+
+/* { dg-do run } */
+/* { dg-output "The answer is 42(\n|\r\n|\r)+" } */
+
+#include <stdio.h>
+
+int var = 42;
+
+int
+main ()
+{
+#pragma omp target
+    {
+      printf ("The answer is %d\n", var);
+    }
+}
diff --git a/libgomp/testsuite/libgomp.fortran/target-print-1.f90 b/libgomp/testsuite/libgomp.fortran/target-print-1.f90
new file mode 100644
index 00000000000..73ee09a2b79
--- /dev/null
+++ b/libgomp/testsuite/libgomp.fortran/target-print-1.f90
@@ -0,0 +1,14 @@
+! Ensure that printf on the offload device works.
+
+! { dg-do run }
+! { dg-output "The answer is 42(\n|\r\n|\r)+" }
+
+program main
+  implicit none
+  integer :: var = 42
+
+!$omp target 
+  write (0, '("The answer is ", I2)') var
+!$omp end target
+
+end program main
diff --git a/libgomp/testsuite/libgomp.oacc-c/print-1.c b/libgomp/testsuite/libgomp.oacc-c/print-1.c
new file mode 100644
index 00000000000..593885b5c2c
--- /dev/null
+++ b/libgomp/testsuite/libgomp.oacc-c/print-1.c
@@ -0,0 +1,17 @@
+/* Ensure that printf on the offload device works.  */
+
+/* { dg-do run } */
+/* { dg-output "The answer is 42(\n|\r\n|\r)+" } */
+
+#include <stdio.h>
+
+int var = 42;
+
+int
+main ()
+{
+#pragma acc parallel
+    {
+      printf ("The answer is %d\n", var);
+    }
+}
diff --git a/libgomp/testsuite/libgomp.oacc-fortran/print-1.f90 b/libgomp/testsuite/libgomp.oacc-fortran/print-1.f90
new file mode 100644
index 00000000000..bef664df4fa
--- /dev/null
+++ b/libgomp/testsuite/libgomp.oacc-fortran/print-1.f90
@@ -0,0 +1,14 @@
+! Ensure that printf on the offload device works.
+
+! { dg-do run }
+! { dg-output "The answer is 42(\n|\r\n|\r)+" }
+
+program main
+  implicit none
+  integer :: var = 42
+
+!$acc parallel
+  write (0, '("The answer is ", I2)') var
+!$acc end parallel
+
+end program main