Changed the impls argument to be an array name.

Turns out, you can't use preprocessor directives inside macro arguments.
Who'd have thought?

modules/gpu/perf/perf_main.cpp

@@ -44,8 +44,11 @@
 
 using namespace perf;
 
-CV_PERF_TEST_MAIN_WITH_IMPLS(gpu, (
+static const char * impls[] = {
 #ifdef HAVE_CUDA
     "cuda",
 #endif
-                                   "plain"), printCudaInfo())
+    "plain"
+};
+
+CV_PERF_TEST_MAIN_WITH_IMPLS(gpu, impls, printCudaInfo())

modules/nonfree/perf/perf_main.cpp

@@ -1,8 +1,11 @@
 #include "perf_precomp.hpp"
 #include "opencv2/ts/gpu_perf.hpp"
 
-CV_PERF_TEST_MAIN_WITH_IMPLS(nonfree, (
+static const char * impls[] = {
 #ifdef HAVE_CUDA
     "cuda",
 #endif
-                                       "plain"), perf::printCudaInfo())
+    "plain"
+};
+
+CV_PERF_TEST_MAIN_WITH_IMPLS(nonfree, impls, perf::printCudaInfo())

modules/superres/perf/perf_main.cpp

@@ -44,8 +44,11 @@
 
 using namespace perf;
 
-CV_PERF_TEST_MAIN_WITH_IMPLS(superres, (
+static const char * impls[] = {
 #ifdef HAVE_CUDA
     "cuda",
 #endif
-                                        "plain"), printCudaInfo())
+    "plain"
+};
+
+CV_PERF_TEST_MAIN_WITH_IMPLS(superres, impls, printCudaInfo())

modules/ts/include/opencv2/ts/ts_perf.hpp

@@ -475,25 +475,31 @@ CV_EXPORTS void PrintTo(const Size& sz, ::std::ostream* os);
     INSTANTIATE_TEST_CASE_P(/*none*/, fixture##_##name, params);\
     void fixture##_##name::PerfTestBody()
 
-#define CV_PERF_UNWRAP_IMPLS(...) __VA_ARGS__
 
-// "plain" should always be one of the implementations
-#define CV_PERF_TEST_MAIN_WITH_IMPLS(modulename, impls, ...) \
-int main(int argc, char **argv)\
-{\
+#define CV_PERF_TEST_MAIN_INTERNALS(modulename, impls, ...) \
     while (++argc >= (--argc,-1)) {__VA_ARGS__; break;} /*this ugly construction is needed for VS 2005*/\
-    std::string impls_[] = { CV_PERF_UNWRAP_IMPLS impls };\
     ::perf::Regression::Init(#modulename);\
-    ::perf::TestBase::Init(std::vector<std::string>(impls_, impls_ + sizeof impls_ / sizeof *impls_),\
+    ::perf::TestBase::Init(std::vector<std::string>(impls, impls + sizeof impls / sizeof *impls),\
                            argc, argv);\
     ::testing::InitGoogleTest(&argc, argv);\
     cvtest::printVersionInfo();\
     ::testing::Test::RecordProperty("cv_module_name", #modulename);\
     ::perf::TestBase::RecordRunParameters();\
-    return RUN_ALL_TESTS();\
+    return RUN_ALL_TESTS();
+
+// impls must be an array, not a pointer; "plain" should always be one of the implementations
+#define CV_PERF_TEST_MAIN_WITH_IMPLS(modulename, impls, ...) \
+int main(int argc, char **argv)\
+{\
+    CV_PERF_TEST_MAIN_INTERNALS(modulename, impls, __VA_ARGS__)\
 }
 
-#define CV_PERF_TEST_MAIN(modulename, ...) CV_PERF_TEST_MAIN_WITH_IMPLS(modulename, ("plain"), __VA_ARGS__)
+#define CV_PERF_TEST_MAIN(modulename, ...) \
+int main(int argc, char **argv)\
+{\
+    const char * plain_only[] = { "plain" };\
+    CV_PERF_TEST_MAIN_INTERNALS(modulename, plain_only, __VA_ARGS__)\
+}
 
 #define TEST_CYCLE_N(n) for(declare.iterations(n); startTimer(), next(); stopTimer())
 #define TEST_CYCLE() for(; startTimer(), next(); stopTimer())