[CMake] Fix examples linking against libz3 when it is built as a

static library on Linux.

CMakeLists.txt

@@ -147,7 +147,6 @@ set(Z3_COMPONENT_CXX_FLAGS "")
 set(Z3_COMPONENT_EXTRA_INCLUDE_DIRS "")
 set(Z3_DEPENDENT_LIBS "")
 set(Z3_DEPENDENT_EXTRA_CXX_LINK_FLAGS "")
-set(Z3_DEPENDENT_EXTRA_C_LINK_FLAGS "")
 
 ################################################################################
 # Build type
@@ -296,10 +295,6 @@ if (OPENMP_FOUND)
         ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU"))
       list(APPEND Z3_DEPENDENT_EXTRA_CXX_LINK_FLAGS ${OpenMP_CXX_FLAGS})
     endif()
-    if (("${CMAKE_C_COMPILER_ID}" MATCHES "Clang") OR
-        ("${CMAKE_C_COMPILER_ID}" MATCHES "GNU"))
-      list(APPEND Z3_DEPENDENT_EXTRA_C_LINK_FLAGS ${OpenMP_C_FLAGS})
-    endif()
     unset(CMAKE_REQUIRED_FLAGS)
     message(STATUS "Using OpenMP")
 else()
@@ -386,7 +381,6 @@ message(STATUS "Z3_COMPONENT_CXX_FLAGS: ${Z3_COMPONENT_CXX_FLAGS}")
 message(STATUS "Z3_DEPENDENT_LIBS: ${Z3_DEPENDENT_LIBS}")
 message(STATUS "Z3_COMPONENT_EXTRA_INCLUDE_DIRS: ${Z3_COMPONENT_EXTRA_INCLUDE_DIRS}")
 message(STATUS "Z3_DEPENDENT_EXTRA_CXX_LINK_FLAGS: ${Z3_DEPENDENT_EXTRA_CXX_LINK_FLAGS}")
-message(STATUS "Z3_DEPENDENT_EXTRA_C_LINK_FLAGS: ${Z3_DEPENDENT_EXTRA_C_LINK_FLAGS}")
 
 ################################################################################
 # Z3 installation locations

contrib/cmake/examples/c++/CMakeLists.txt

@@ -20,9 +20,3 @@ message(STATUS "Z3_DIR: ${Z3_DIR}")
 add_executable(cpp_example example.cpp)
 target_include_directories(cpp_example PRIVATE ${Z3_CXX_INCLUDE_DIRS})
 target_link_libraries(cpp_example PRIVATE ${Z3_LIBRARIES})
-
-# FIXME: The Z3 package does not export information on the link flags
-# This is needed for when libz3 is built as a static library
-#if (NOT BUILD_LIBZ3_SHARED)
-#  z3_append_linker_flag_list_to_target(cpp_example ${Z3_DEPENDENT_EXTRA_CXX_LINK_FLAGS})
-#endif()

contrib/cmake/examples/c/CMakeLists.txt

@@ -1,7 +1,11 @@
 ################################################################################
 # Example C project
 ################################################################################
-project(Z3_C_EXAMPLE C)
+# NOTE: Even though this is a C project, libz3 uses C++. When using libz3
+# as a static library if we don't configure this project to also support
+# C++ we will use the C linker rather than the C++ linker and will not link
+# the C++ standard library in resulting in a link failure.
+project(Z3_C_EXAMPLE C CXX)
 cmake_minimum_required(VERSION 2.8.12)
 find_package(Z3
   REQUIRED
@@ -20,9 +24,3 @@ message(STATUS "Z3_DIR: ${Z3_DIR}")
 add_executable(c_example test_capi.c)
 target_include_directories(c_example PRIVATE ${Z3_C_INCLUDE_DIRS})
 target_link_libraries(c_example PRIVATE ${Z3_LIBRARIES})
-
-# FIXME: The Z3 package does not export information on the link flags
-# This is needed for when libz3 is built as a static library
-#if (NOT BUILD_LIBZ3_SHARED)
-#  z3_append_linker_flag_list_to_target(c_example ${Z3_DEPENDENT_EXTRA_C_LINK_FLAGS})
-#endif()

contrib/cmake/examples/tptp/CMakeLists.txt

@@ -20,9 +20,3 @@ message(STATUS "Z3_DIR: ${Z3_DIR}")
 add_executable(z3_tptp5 tptp5.cpp tptp5.lex.cpp)
 target_include_directories(z3_tptp5 PRIVATE ${Z3_CXX_INCLUDE_DIRS})
 target_link_libraries(z3_tptp5 PRIVATE ${Z3_LIBRARIES})
-
-# FIXME: The Z3 package does not export information on the link flags
-# This is needed for when libz3 is built as a static library
-#if (NOT BUILD_LIBZ3_SHARED)
-#  z3_append_linker_flag_list_to_target(z3_tptp5 ${Z3_DEPENDENT_EXTRA_CXX_LINK_FLAGS})
-#endif()

contrib/cmake/src/CMakeLists.txt

@@ -143,7 +143,13 @@ endif()
 # so that if those are also shared libraries they are referenced by `libz3.so`.
 target_link_libraries(libz3 PRIVATE ${Z3_DEPENDENT_LIBS})
 
-z3_append_linker_flag_list_to_target(libz3 ${Z3_DEPENDENT_EXTRA_CXX_LINK_FLAGS})
+# This is currently only for the OpenMP flags. It needs to be set
+# via `target_link_libraries()` rather than `z3_append_linker_flag_list_to_target()`
+# because when building the `libz3` as a static library when the target is exported
+# the link dependencies need to be exported too.
+foreach (flag_name ${Z3_DEPENDENT_EXTRA_CXX_LINK_FLAGS})
+  target_link_libraries(libz3 PRIVATE ${flag_name})
+endforeach()
 
 # Declare which header file are the public header files of libz3
 # these will automatically installed when the libz3 target is installed

contrib/cmake/src/api/java/CMakeLists.txt

@@ -44,7 +44,6 @@ target_link_libraries(z3java PRIVATE libz3)
 # Z3's components to build ``Native.cpp`` lets do the same for now.
 target_compile_options(z3java PRIVATE ${Z3_COMPONENT_CXX_FLAGS})
 target_compile_definitions(z3java PRIVATE ${Z3_COMPONENT_CXX_DEFINES})
-z3_append_linker_flag_list_to_target(z3java ${Z3_DEPENDENT_EXTRA_CXX_LINK_FLAGS})
 target_include_directories(z3java PRIVATE
   "${CMAKE_SOURCE_DIR}/src/api"
   "${CMAKE_BINARY_DIR}/src/api"