Fix compiling without shared

[proller]

No description provided.

[redboltz]

@proller, thank you for sending the PR. I think that -Wno-mismatched-tags is not related to MSGPACK_ENABLE_SHARED. When -Wno-mismatched-tags is given, the following code doesn't make the warining "warning: 'foo' defined as a struct here but previously declared as a class [-Wmismatched-tags]".

class foo;
struct foo {};

See:
http://melpon.org/wandbox/permlink/Agqg5dsVbGMYERvW (with -Wno-mismatched-tags )
http://melpon.org/wandbox/permlink/da6IyphldlxKWZ4Y (without -Wno-mismatched-tags )

[proller]

i dont change warning options, i just add condition IF (MSGPACK_ENABLE_SHARED)
because if MSGPACK_ENABLE_SHARED = false
then
TARGET msgpackc
failed because here is no msgpackc

[redboltz]

I understand. The reason that I got confused is the option -Wno-mismatched-tags is only applied to msgpackc. It should be applied msgpackc-static too. It's not your pull requests problem. I will add the code that adds -Wno-mismatched-tags to msgpackc-static as follows and then merge the pull request.

 IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
 -    SET_PROPERTY (TARGET msgpackc APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
 +    IF (MSGPACK_ENABLE_SHARED)
 +        SET_PROPERTY (TARGET msgpackc APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
 +    ENDIF ()
 +    SET_PROPERTY (TARGET msgpackc-static APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
  ENDIF ()

  IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
      IF ((CMAKE_CXX_COMPILER_VERSION VERSION_GREATER ${GNUCXX_NO_MISMATCHED_TAGS_SUPPORT_VERSION}) OR
          (CMAKE_CXX_COMPILER_VERSION VERSION_EQUAL   ${GNUCXX_NO_MISMATCHED_TAGS_SUPPORT_VERSION}))
 -    SET_PROPERTY (TARGET msgpackc APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
 +        IF (MSGPACK_ENABLE_SHARED)
 +            SET_PROPERTY (TARGET msgpackc APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
 +        ENDIF ()
 +        SET_PROPERTY (TARGET msgpackc-static APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-mismatched-tags")
      ENDIF ()
  ENDIF ()