[CMake] Introduce POLLY_BUNDLED_JSONCPP.

Allow using a system's install jsoncpp library instead of the bundled
one with the setting POLLY_BUNDLED_JSONCPP=OFF.

This fixes llvm.org/PR32929

Differential Revision: https://reviews.llvm.org/D32922

llvm-svn: 302336

2 files changed, 60 insertions, 0 deletions

diff --git a/polly/cmake/FindJsoncpp.cmake b/polly/cmake/FindJsoncpp.cmake
new file mode 100644
index 00000000000..25c6828fdb1
--- /dev/null
+++ b/polly/cmake/FindJsoncpp.cmake
@@ -0,0 +1,58 @@
+find_package(PkgConfig QUIET)
+if (PkgConfig_FOUND)
+  pkg_search_module(JSONCPP jsoncpp QUIET)
+
+  # Get the libraries full paths, to be consistent with find_library().
+  set(fulllibs)
+  foreach (libname IN LISTS JSONCPP_LIBRARIES)
+    find_library(lib NAMES ${libname} 
+      HINTS ${JSONCPP_LIBDIR} ${JSONCPP_LIBRARY_DIRS}
+      NO_DEFAULT_PATH
+    )
+    if (lib)
+      list(APPEND fulllibs ${lib})
+    else ()
+      list(APPEND fulllibs ${libname})
+    endif ()
+  endforeach ()
+  set(JSONCPP_LIBRARIES ${fulllibs})
+
+  set(JSONCPP_DEFINITIONS ${JSONCPP_CFLAGS})
+else ()
+  set(JSONCPP_DEFINITIONS)
+
+  find_path(JSONCPP_INCLUDE_DIR json/json.h
+    PATHS ENV JSONCPP_INCLUDE ENV JSONCPP_DIR
+    PATH_SUFFIXES jsoncpp
+    NO_DEFAULT_PATH
+  )
+  find_path(JSONCPP_INCLUDE_DIR json/json.h
+    PATH_SUFFIXES jsoncpp
+  )
+  mark_as_advanced(JSONCPP_INCLUDE_DIR)
+  set(JSONCPP_INCLUDE_DIRS "${JSONCPP_INCLUDE_DIR}")
+
+  find_library(JSONCPP_LIBRARY NAMES jsoncpp
+    HINTS ENV JSONCPP_LIB ENV JSONCPP_DIR
+    NO_DEFAULT_PATH
+  )
+  find_library(JSONCPP_LIBRARY NAMES jsoncpp)
+  mark_as_advanced(JSONCPP_LIBRARY)
+  set(JSON_LIBRARIES ${JSON_LIBRARY})
+endif ()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Jsoncpp DEFAULT_MSG JSONCPP_INCLUDE_DIRS JSONCPP_LIBRARIES JSONCPP_DEFINITIONS)
+
+if (Jsoncpp_FOUND)
+  add_library(jsoncpp INTERFACE IMPORTED)
+  foreach (incl IN LISTS JSONCPP_INCLUDE_DIRS)
+    set_property(TARGET jsoncpp APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${incl})
+  endforeach ()
+  foreach (libname IN LISTS JSONCPP_LIBRARIES)
+    set_property(TARGET jsoncpp APPEND PROPERTY INTERFACE_LINK_LIBRARIES ${lib})
+  endforeach ()
+  foreach (opt IN LISTS JSONCPP_DEFINITIONS)
+    set_property(TARGET jsoncpp APPEND PROPERTY INTERFACE_COMPILE_OPTIONS ${opt})
+  endforeach ()
+endif ()
diff --git a/polly/cmake/PollyConfig.cmake.in b/polly/cmake/PollyConfig.cmake.in
index cef97a8f424..42ff45ce0bc 100644
--- a/polly/cmake/PollyConfig.cmake.in
+++ b/polly/cmake/PollyConfig.cmake.in
@@ -5,6 +5,7 @@ find_package(LLVM REQUIRED CONFIG
 
 set(Polly_CMAKE_DIR ${CMAKE_CURRENT_LIST_DIR})
 set(Polly_BUNDLED_ISL @POLLY_BUNDLED_ISL@)
+set(Polly_BUNDLED_JSONCPP @POLLY_BUNDLED_JSONCPP@)
 set(Polly_ENABLE_GPGPU_CODEGEN @POLLY_ENABLE_GPGPU_CODEGEN@)
 
 set(Polly_DEFINITIONS ${LLVM_DEFINITIONS})
@@ -27,6 +28,7 @@ if (NOT TARGET Polly)
   if (Polly_ENABLE_GPGPU_CODEGEN)
     set_property(TARGET Polly APPEND PROPERTY INTERFACE_LINK_LIBRARIES PollyPPCG)
   endif()
+  set_property(TARGET Polly APPEND PROPERTY INTERFACE_LINK_LIBRARIES @JSONCPP_LIBRARIES@)
 endif()
 
 if (NOT TARGET LLVMPolly)