[libFuzzer] Export external functions on tests.

Marcos Pividori · Marcos Pividori · commit a0b23b8e637c · 2017-02-10T01:40:28.000Z
We need to export external functions so they are found when calling GetProcAddress() on Windows. But we can't use `__declspec(dllexport)` because we want the targets to be completely independent from the fuzz engines and don't depend on other header files. Also, we don't want to include platform specific code managed with conditional macros. So, the solution is to add the exported symbols with linker flags in cmake. Differential revision: https://reviews.llvm.org/D29752 llvm-svn: 294688
diff --git a/llvm/lib/Fuzzer/test/CMakeLists.txt b/llvm/lib/Fuzzer/test/CMakeLists.txt
@@ -142,6 +142,18 @@ foreach(Test ${Tests})
   add_libfuzzer_test(${Test} SOURCES ${Test}.cpp)
 endforeach()
 
+function(test_export_symbol target symbol)
+  if(MSVC)
+    set_target_properties(LLVMFuzzer-${target} PROPERTIES LINK_FLAGS
+        "-export:${symbol}")
+  endif()
+endfunction()
+
+test_export_symbol(InitializeTest "LLVMFuzzerInitialize")
+test_export_symbol(BogusInitializeTest "LLVMFuzzerInitialize")
+test_export_symbol(CustomCrossOverTest "LLVMFuzzerCustomCrossOver")
+test_export_symbol(CustomMutatorTest "LLVMFuzzerCustomMutator")
+
 ###############################################################################
 # Unit tests
 ###############################################################################
