Fix fuzzing build (#250)

Fixes issues with OSS-Fuzz.

Author: palemieux

CMakeLists.txt

@@ -249,5 +249,7 @@ if(OJPH_BUILD_FUZZER)
     message(FATAL_ERROR "Fuzzing requires a Clang toolchain.")
   endif()
 
+  message(STATUS "Building fuzzer target")
+
   add_subdirectory(fuzzing)
 endif()

docs/fuzzing.md

@@ -7,7 +7,7 @@ podman build -t openjph-fuzz  -f fuzzing/Dockerfile
 podman run -it --rm -v $(pwd):/app/ojph/ openjph-fuzz bash
 image# mkdir /app/build/
 image# cd /app/build/
-image# cmake /app/ojph -DOJPH_BUILD_FUZZER=ON -DBUILD_SHARED_LIBS=OFF
+image# cmake /app/ojph -DCMAKE_CXX_FLAGS="-fsanitize=fuzzer,address" -DOJPH_BUILD_FUZZER=ON -DBUILD_SHARED_LIBS=OFF
 image# make
 image# ./fuzzing/ojph_expand_fuzz_target /app/jp2k_test_codestreams/openjph/*.j2c
 ```

fuzzing/CMakeLists.txt

@@ -1,10 +1,4 @@
-if(DEFINED ENV{BUILD_UID})
-  link_libraries($ENV{LIB_FUZZING_ENGINE})
-else()
-  add_compile_options(-fsanitize=fuzzer,address)
-  add_link_options(-fsanitize=fuzzer,address)
-endif()
+link_libraries($ENV{LIB_FUZZING_ENGINE})
 
 add_executable(ojph_expand_fuzz_target fuzz_targets/ojph_expand_fuzz_target.cpp)
 target_link_libraries(ojph_expand_fuzz_target PRIVATE openjph)
-