Added functionality to find the fuzzer_no_main dependency automatically for custom installations as well

Author: PBetzler

src/advanced_examples/CMakeLists.txt

@@ -1,6 +1,5 @@
 set(OPENSSL_USE_STATIC_LIBS TRUE)
 find_package(OpenSSL REQUIRED)
-#include(libprotobuf-mutator)
 add_compile_options(-O0)
 
 add_library(explore_me_advanced
@@ -17,6 +16,36 @@ target_link_libraries(explore_me_advanced
     -lz
 )
 
+
+#
+# Block defining the location of the fuzzer_no_main library that is needed to compile this example
+#
+
+# Uncomment and change to your own path if you want to specify a specific fuzzer_no_main library
+#set(FUZZER_NO_MAIN_PATH /usr/lib/clang/${CMAKE_C_COMPILER_VERSION}/lib/linux/libclang_rt.fuzzer_no_main-${CMAKE_SYSTEM_PROCESSOR}.a)
+
+
+# If location is not manually defined, we search for it.
+if (NOT DEFINED FUZZER_NO_MAIN_PATH)
+    execute_process(COMMAND clang --print-file-name libclang_rt.fuzzer_no_main-${CMAKE_SYSTEM_PROCESSOR}.a 
+        OUTPUT_VARIABLE FUZZER_NO_MAIN_PATH 
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+
+    # If the first search was not successful, we check if the dependency is there, but does not contain the architecture information
+    # in its name, as it is common if you compile the sources yourself.
+    if(NOT ${FUZZER_NO_MAIN_PATH} MATCHES "\/")
+        execute_process(COMMAND clang --print-file-name libclang_rt.fuzzer_no_main.a 
+            OUTPUT_VARIABLE FUZZER_NO_MAIN_PATH 
+            OUTPUT_STRIP_TRAILING_WHITESPACE
+        )
+    endif()
+endif()
+
+#
+# End of fuzzer_no_main definition
+#
+
 foreach(TestType IN ITEMS
     structured_input_checks
     custom_mutator_example_checks
@@ -31,7 +60,7 @@ foreach(TestType IN ITEMS
     )
 
     target_link_libraries(${TestType}_test
-        /usr/lib/clang/${CMAKE_C_COMPILER_VERSION}/lib/linux/libclang_rt.fuzzer_no_main-${CMAKE_SYSTEM_PROCESSOR}.a
+        ${FUZZER_NO_MAIN_PATH}
         explore_me_advanced
         GTest::gtest_main
     )
@@ -43,7 +72,7 @@ foreach(TestType IN ITEMS
     )
 
     target_link_libraries(${TestType}_fuzz_test
-        /usr/lib/clang/${CMAKE_C_COMPILER_VERSION}/lib/linux/libclang_rt.fuzzer_no_main-${CMAKE_SYSTEM_PROCESSOR}.a
+        ${FUZZER_NO_MAIN_PATH}
         explore_me_advanced
         GTest::gtest        
     )