Fix mac compilation by replacing c11 to c++11 in flags, add cmake file

Makefile

@@ -302,17 +302,19 @@ mysql: ${MYSQL} libhl
 sqlite: ${SQLITE} libhl
 	${CC} ${CFLAGS} -shared -o sqlite.hdll ${SQLITE} ${LIBFLAGS} -L. -lhl -lsqlite3
 
+CXXFLAGS:=$(filter-out -std=c11,$(CFLAGS)) -std=c++11
+
 ./include/mikktspace/%.o: ./include/mikktspace/%.c
 	${CC} ${CFLAGS} -o $@ -c $< ${HEAPS_CFLAGS}
 
 ./include/meshoptimizer/%.o: ./include/meshoptimizer/%.cpp
-	${CC} ${CFLAGS} -o $@ -c $< ${HEAPS_CFLAGS}
+	${CC} ${CXXFLAGS} -o $@ -c $< ${HEAPS_CFLAGS}
 
 ./libs/heaps/%.o: ./libs/heaps/%.c
 	${CC} ${CFLAGS} -o $@ -c $< ${HEAPS_CFLAGS}
 
 ./libs/heaps/%.o: ./libs/heaps/%.cpp
-	${CC} ${CFLAGS} -o $@ -c $< ${HEAPS_CFLAGS}
+	${CC} ${CXXFLAGS} -o $@ -c $< ${HEAPS_CFLAGS}
 
 heaps: ${HEAPS} libhl
 	${CC} ${CFLAGS} ${HEAPS_CFLAGS} -shared -o heaps.hdll ${HEAPS} ${LIBFLAGS} -L. -lhl

libs/heaps/CMakeLists.txt

@@ -0,0 +1,46 @@
+set(HEAPS_INCLUDE_DIRS
+    ${INCLUDES_BASE_DIR}/mikktspace
+    ${INCLUDES_BASE_DIR}/meshoptimizer
+    ${INCLUDES_BASE_DIR}/vhacd
+    .
+)
+
+add_library(heaps.hdll SHARED
+    ${INCLUDES_BASE_DIR}/mikktspace/mikktspace.c
+    ${INCLUDES_BASE_DIR}/meshoptimizer/allocator.cpp
+    ${INCLUDES_BASE_DIR}/meshoptimizer/overdrawoptimizer.cpp
+	${INCLUDES_BASE_DIR}/meshoptimizer/vcacheoptimizer.cpp
+    ${INCLUDES_BASE_DIR}/meshoptimizer/clusterizer.cpp
+	${INCLUDES_BASE_DIR}/meshoptimizer/quantization.cpp
+    ${INCLUDES_BASE_DIR}/meshoptimizer/vertexcodec.cpp
+	${INCLUDES_BASE_DIR}/meshoptimizer/indexcodec.cpp
+    ${INCLUDES_BASE_DIR}/meshoptimizer/simplifier.cpp
+	${INCLUDES_BASE_DIR}/meshoptimizer/vertexfilter.cpp
+    ${INCLUDES_BASE_DIR}/meshoptimizer/indexgenerator.cpp
+	${INCLUDES_BASE_DIR}/meshoptimizer/spatialorder.cpp
+    ${INCLUDES_BASE_DIR}/meshoptimizer/vfetchanalyzer.cpp
+	${INCLUDES_BASE_DIR}/meshoptimizer/stripifier.cpp
+    ${INCLUDES_BASE_DIR}/meshoptimizer/vfetchoptimizer.cpp
+	${INCLUDES_BASE_DIR}/meshoptimizer/overdrawanalyzer.cpp
+    ${INCLUDES_BASE_DIR}/meshoptimizer/vcacheanalyzer.cpp
+    mikkt.c
+    meshoptimizer.cpp
+    vhacd.cpp
+)
+
+set_as_hdll(heaps)
+
+target_include_directories(heaps.hdll
+    PRIVATE
+    ${HEAPS_INCLUDE_DIRS}
+)
+
+target_link_libraries(heaps.hdll
+    libhl
+)
+
+install(
+    TARGETS
+        heaps.hdll
+    DESTINATION ${HDLL_DESTINATION}
+)