libgomp/testsuite: Fix checks for dg-excess-errors

For the tests modified below, the effective target line has to be effective
when compiling for an offload target, except that variable-not-offloaded.c
would compile with unified-share memory and pr86416-*.c if long double/float128
is supported.
The previous check used a run-time device ability check. This new variant
now enables those dg- lines when _compiling_ for nvptx or gcn.

libgomp/ChangeLog:

	* testsuite/lib/libgomp.exp (offload_target_to_openacc_device_type):
	New, based on check_effective_target_offload_target_nvptx.
	(check_effective_target_offload_target_nvptx): Call it.
	(check_effective_target_offload_target_amdgcn): New.
	* testsuite/libgomp.c-c++-common/function-not-offloaded.c:
	Require target offload_target_nvptx || offload_target_amdgcn.
	* testsuite/libgomp.c-c++-common/variable-not-offloaded.c: Likewise.
	* testsuite/libgomp.c/pr86416-1.c: Likewise.
	* testsuite/libgomp.c/pr86416-2.c: Likewise.

libgomp/testsuite/lib/libgomp.exp

@@ -340,8 +340,10 @@ proc offload_target_to_openacc_device_type { offload_target } {
     }
 }
 
-# Return 1 if compiling for offload target nvptx.
-proc check_effective_target_offload_target_nvptx { } {
+# Return 1 if compiling for the specified offload target
+# Takes -foffload=... into account by checking OFFLOAD_TARGET_NAMES=
+# in the -v compiler output.
+proc libgomp_check_effective_target_offload_target { target_name } {
     # Consider all actual options, including the flags passed to
     # 'gcc-dg-runtest', or 'gfortran-dg-runtest' (see the 'libgomp.*/*.exp'
     # files; in particular, '-foffload', 'libgomp.oacc-*/*.exp'), which don't
@@ -354,13 +356,23 @@ proc check_effective_target_offload_target_nvptx { } {
     set gcc_output [libgomp_target_compile "" "" "none" $options]
     if [regexp "(?n)^OFFLOAD_TARGET_NAMES=(.*)" $gcc_output dummy offload_targets] {
 	verbose "compiling for offload targets: $offload_targets"
-	return [string match "*:nvptx*:*" ":$offload_targets:"]
+	return [string match "*:$target_name*:*" ":$offload_targets:"]
     }
 
-    verbose "not compiling for any offload targets"
+    verbose "not compiling for $target_name offload target"
     return 0
 }
 
+# Return 1 if compiling for offload target nvptx.
+proc check_effective_target_offload_target_nvptx { } {
+    return [libgomp_check_effective_target_offload_target "nvptx"]
+}
+
+# Return 1 if compiling for offload target amdgcn
+proc check_effective_target_offload_target_amdgcn { } {
+    return [libgomp_check_effective_target_offload_target "amdgcn"]
+}
+
 # Return 1 if offload device is available.
 proc check_effective_target_offload_device { } {
     return [check_runtime_nocache offload_device_available_ {

libgomp/testsuite/libgomp.c-c++-common/function-not-offloaded.c

@@ -1,5 +1,5 @@
 /* { dg-do link } */
-/* { dg-excess-errors "unresolved symbol foo, lto1, mkoffload and lto-wrapper fatal errors" { target offload_device_nonshared_as } } */
+/* { dg-excess-errors "unresolved symbol foo, lto1, mkoffload and lto-wrapper fatal errors" { target { offload_target_nvptx || offload_target_amdgcn } } } */
 /* { dg-additional-sources "function-not-offloaded-aux.c" } */
 
 #pragma omp declare target

libgomp/testsuite/libgomp.c-c++-common/variable-not-offloaded.c

@@ -1,7 +1,7 @@
 /* { dg-do link } */
-/* { dg-excess-errors "lto1, mkoffload and lto-wrapper fatal errors" { target offload_device_nonshared_as } } */
+/* { dg-excess-errors "lto1, mkoffload and lto-wrapper fatal errors" { target { offload_target_nvptx || offload_target_amdgcn } } } */
 
-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 } } */
+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_target_nvptx || offload_target_amdgcn } } } */
 
 #pragma omp declare target
 void  __attribute__((noinline, noclone))

libgomp/testsuite/libgomp.c/pr86416-1.c

@@ -2,8 +2,8 @@
 /* { dg-require-effective-target large_long_double } */
 
 /* PR middle-end/86416  */
-/* { dg-error "bit-precision floating-point numbers unsupported .mode '.F'." "" { target offload_device } 0 }  */
-/* { dg-excess-errors "Follow-up errors from mkoffload and lto-wrapper" { target offload_device } }  */
+/* { dg-error "bit-precision floating-point numbers unsupported .mode '.F'." "" { target { offload_target_nvptx || offload_target_amdgcn } } 0 }  */
+/* { dg-excess-errors "Follow-up errors from mkoffload and lto-wrapper" { target { offload_target_nvptx || offload_target_amdgcn } } }  */
 
 #include <stdlib.h>  /* For abort. */
 

libgomp/testsuite/libgomp.c/pr86416-2.c

@@ -2,8 +2,8 @@
 /* { dg-add-options __float128 } */
 
 /* PR middle-end/86416  */
-/* { dg-error "bit-precision floating-point numbers unsupported .mode '.F'." "" { target offload_device } 0 }  */
-/* { dg-excess-errors "Follow-up errors from mkoffload and lto-wrapper" { target offload_device } }  */
+/* { dg-error "bit-precision floating-point numbers unsupported .mode '.F'." "" { target { offload_target_nvptx || offload_target_amdgcn } } 0 }  */
+/* { dg-excess-errors "Follow-up errors from mkoffload and lto-wrapper" { target { offload_target_nvptx || offload_target_amdgcn } } }  */
 
 #include <stdlib.h>  /* For abort. */