[CMake] FindJsoncpp.cmake: Use descriptive variable name for libjsoncpp.so path.

find_library(lib) stores the result in the variable "lib", which is also
cached in CMakeCache.txt.  This could theoretically conflict if jsoncpp
required two libraries, which each would get cached as "lib".  Use a
more descriptive and disambiguative "jsoncpp_${libname}" for that.

llvm-svn: 308289

polly/cmake/FindJsoncpp.cmake

@@ -5,11 +5,11 @@ if (PkgConfig_FOUND)
   # Get the libraries full paths, to be consistent with find_library().
   set(fulllibs)
   foreach (libname IN LISTS JSONCPP_LIBRARIES)
-    find_library(lib NAMES ${libname}
+    find_library(jsoncpp_lib${libname} NAMES ${libname}
       HINTS ${JSONCPP_LIBDIR} ${JSONCPP_LIBRARY_DIRS}
     )
-    if (lib)
-      list(APPEND fulllibs ${lib})
+    if (jsoncpp_lib${libname})
+      list(APPEND fulllibs ${jsoncpp_lib${libname}})
     else ()
       list(APPEND fulllibs ${libname})
     endif ()