Fixed #1025.

Propagate compiler options that are decided by cmake options to the
parent project.

Author: redboltz

CMakeLists.txt

@@ -4,6 +4,8 @@ CMAKE_POLICY (SET CMP0054 NEW)
 
 PROJECT (msgpack LANGUAGES CXX)
 
+ADD_LIBRARY (msgpackc-cxx INTERFACE)
+
 FILE (READ ${CMAKE_CURRENT_SOURCE_DIR}/include/msgpack/version_master.hpp contents)
 STRING (REGEX MATCH "#define MSGPACK_VERSION_MAJOR *([0-9a-zA-Z_]*)" NULL_OUT ${contents})
 SET (VERSION_MAJOR ${CMAKE_MATCH_1})
@@ -55,11 +57,11 @@ ENDIF ()
 
 IF (MSGPACK_32BIT)
     IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
-        SET (CMAKE_CXX_FLAGS "-m32 ${CMAKE_CXX_FLAGS}")
-        SET (CMAKE_EXE_LINKER_FLAGS "-m32 ${CMAKE_EXE_LINKER_FLAGS}")
+        TARGET_COMPILE_OPTIONS(msgpackc-cxx INTERFACE -m32)
+        TARGET_LINK_OPTIONS(msgpackc-cxx INTERFACE -m32)
     ELSEIF ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
-        SET (CMAKE_CXX_FLAGS "-m32 ${CMAKE_CXX_FLAGS}")
-        SET (CMAKE_EXE_LINKER_FLAGS "-m32 ${CMAKE_EXE_LINKER_FLAGS}")
+        TARGET_COMPILE_OPTIONS(msgpackc-cxx INTERFACE -m32)
+        TARGET_LINK_OPTIONS(msgpackc-cxx INTERFACE -m32)
     ENDIF ()
 ENDIF ()
 
@@ -76,18 +78,18 @@ IF (MSGPACK_USE_BOOST)
 
     FIND_PACKAGE (Boost REQUIRED)
 ELSE ()
-    SET (CMAKE_CXX_FLAGS "-DMSGPACK_NO_BOOST ${CMAKE_CXX_FLAGS}")
+    TARGET_COMPILE_DEFINITIONS(msgpackc-cxx INTERFACE MSGPACK_NO_BOOST)
 ENDIF ()
 
 IF (MSGPACK_CHAR_SIGN)
-    SET (CMAKE_CXX_FLAGS "-f${MSGPACK_CHAR_SIGN}-char ${CMAKE_CXX_FLAGS}")
+    TARGET_COMPILE_OPTIONS(msgpackc-cxx INTERFACE -f${MSGPACK_CHAR_SIGN}-char)
 ENDIF ()
 
 IF (MSGPACK_DEFAULT_API_VERSION)
-    SET (CMAKE_CXX_FLAGS "-DMSGPACK_DEFAULT_API_VERSION=${MSGPACK_DEFAULT_API_VERSION} ${CMAKE_CXX_FLAGS}")
+    TARGET_COMPILE_DEFINITIONS(msgpackc-cxx INTERFACE MSGPACK_DEFAULT_API_VERSION=${MSGPACK_DEFAULT_API_VERSION})
 ELSE ()
     SET (MSGPACK_DEFAULT_API_VERSION 3)
-    SET (CMAKE_CXX_FLAGS "-DMSGPACK_DEFAULT_API_VERSION=3 ${CMAKE_CXX_FLAGS}")
+    TARGET_COMPILE_DEFINITIONS(msgpackc-cxx INTERFACE MSGPACK_DEFAULT_API_VERSION=3)
 ENDIF ()
 
 IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
@@ -110,8 +112,6 @@ ENDIF ()
 
 INCLUDE (Files.cmake)
 
-ADD_LIBRARY (msgpackc-cxx INTERFACE)
-
 TARGET_INCLUDE_DIRECTORIES (msgpackc-cxx
     INTERFACE
         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
@@ -134,7 +134,6 @@ IF (MSGPACK_GEN_COVERAGE)
 
     INCLUDE (CodeCoverage)
     SET (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${COVERAGE_FLAGS}")
-
     SETUP_TARGET_FOR_COVERAGE(coverage make coverage test)
 ENDIF ()
 
@@ -157,7 +156,7 @@ IF (MSGPACK_FUZZ_REGRESSION)
 ENDIF ()
 
 IF ("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "sparc")
-    SET (CMAKE_CXX_FLAGS "-DMSGPACK_ZONE_ALIGN=8 ${CMAKE_CXX_FLAGS}")
+    TARGET_COMPILE_DEFINITIONS(msgpackc-cxx INTERFACE MSGPACK_ZONE_ALIGN=8)
 ENDIF ()
 
 IF (MSGPACK_BUILD_EXAMPLES)