From a74ed58893f2e7e27a914c44814c72a60069a9dc Mon Sep 17 00:00:00 2001
From: Anatoliy Talamanov <anatoliy.talamanov@intel.com>
Date: Mon, 22 Jun 2020 00:46:41 +0300
Subject: [PATCH] Add implementation in case plaidml isn't found

---
 .../gapi/src/backends/plaidml/gplaidmlcore.cpp   | 16 +++++++++++++---
 modules/gapi/test/gapi_plaidml_pipelines.cpp     | 13 ++++++++++---
 2 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/modules/gapi/src/backends/plaidml/gplaidmlcore.cpp b/modules/gapi/src/backends/plaidml/gplaidmlcore.cpp
index e81e4b7ea6..c15f84cd1f 100644
--- a/modules/gapi/src/backends/plaidml/gplaidmlcore.cpp
+++ b/modules/gapi/src/backends/plaidml/gplaidmlcore.cpp
@@ -5,12 +5,14 @@
 // Copyright (C) 2019 Intel Corporation
 
 
-#ifdef HAVE_PLAIDML
-
 #include "precomp.hpp"
 
 #include <opencv2/gapi/core.hpp>
+
 #include <opencv2/gapi/plaidml/core.hpp>
+
+#ifdef HAVE_PLAIDML
+
 #include <opencv2/gapi/plaidml/gplaidmlkernel.hpp>
 
 #include <plaidml2/edsl/edsl.h>
@@ -51,4 +53,12 @@ cv::gapi::GKernelPackage cv::gapi::core::plaidml::kernels()
     return pkg;
 }
 
-#endif // HACE_PLAIDML
+#else // HAVE_PLAIDML
+
+cv::gapi::GKernelPackage cv::gapi::core::plaidml::kernels()
+{
+    // Still provide this symbol to avoid linking issues
+    util::throw_error(std::runtime_error("G-API has been compiled without PlaidML2 support"));
+}
+
+#endif // HAVE_PLAIDML
diff --git a/modules/gapi/test/gapi_plaidml_pipelines.cpp b/modules/gapi/test/gapi_plaidml_pipelines.cpp
index a090c99d61..56306b00ec 100644
--- a/modules/gapi/test/gapi_plaidml_pipelines.cpp
+++ b/modules/gapi/test/gapi_plaidml_pipelines.cpp
@@ -5,8 +5,6 @@
 // Copyright (C) 2019 Intel Corporation
 
 
-#ifdef HAVE_PLAIDML
-
 #include "test_precomp.hpp"
 
 #include <stdexcept>
@@ -19,6 +17,8 @@
 namespace opencv_test
 {
 
+#ifdef HAVE_PLAIDML
+
 inline cv::gapi::plaidml::config getConfig()
 {
     auto read_var_from_env = [](const char* env)
@@ -173,6 +173,13 @@ TEST(GAPI_PlaidML_Pipelines, TwoOutputOperations)
     EXPECT_EQ(0, cv::norm(out_mat[1], ref_mat[1]));
 }
 
-} // namespace opencv_test
+#else // HAVE_PLAIDML
+
+TEST(GAPI_PlaidML_Pipelines, ThrowIfPlaidMLNotFound)
+{
+    ASSERT_ANY_THROW(cv::gapi::core::plaidml::kernels());
+}
 
 #endif // HAVE_PLAIDML
+
+} // namespace opencv_test