Reuse most of the already compiled objects for unit test libraries.

CORRADE_GRACEFUL_ASSERT is set only on files where it makes sense, the
rest is shared between main and test libraries. Speeds up the
compilation like infinity times.

CMake 2.8.8 is required for OBJECT library target.

CMakeLists.txt

@@ -1,4 +1,5 @@
-cmake_minimum_required(VERSION 2.6)
+# CMake 2.8.8 required for OBJECT library target
+cmake_minimum_required(VERSION 2.8.8)
 project(Magnum)
 
 option(BUILD_TESTS "Build unit tests (requires Qt4)." OFF)

README.md

@@ -23,7 +23,7 @@ Minimal dependencies
  * C++ compiler with good C++11 support. Currently the only compilers which
    support everything needed are **GCC** >= 4.6 and **Clang** >= 3.1 (from
    SVN).
- * **CMake** >= 2.6
+ * **CMake** >= 2.8.8 (needed for `OBJECT` library target)
  * **OpenGL headers**, on Linux most probably shipped with Mesa
  * **GLEW** - OpenGL extension wrangler
  * **Corrade** - Plugin management and utility library. You can get it at

doc/Building.dox

@@ -12,7 +12,7 @@ Minimal set of tools and libraries required for building is:
 - C++ compiler with good C++11 support. Currently the only compilers which
   support everything needed are **GCC** >= 4.6 and **Clang** >= 3.1 (from
   SVN).
-- **CMake** >= 2.6
+- **CMake** >= 2.8.8 (needed for `OBJECT` library target)
 - **OpenGL** headers, on Linux most probably shipped with Mesa
 - **GLEW** - OpenGL extension wrangler
 - **Corrade** - Plugin management and utility library. You can get it at

src/CMakeLists.txt

@@ -2,14 +2,15 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -pedantic -std=c++0x -fvisibility=
 
 include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${CORRADE_INCLUDE_DIR})
 
-add_subdirectory(Math)
-add_subdirectory(MeshTools)
-add_subdirectory(Physics)
-add_subdirectory(Primitives)
-add_subdirectory(Shaders)
+# On 64bit Linux with GCC flag -fPIC is needed for building some static libraries
+if(CMAKE_SIZEOF_VOID_P EQUAL 8 AND CMAKE_COMPILER_IS_GNUCC AND CMAKE_SYSTEM_NAME STREQUAL "Linux")
+    set(USE_FPIC ON)
+else()
+    set(USE_FPIC OFF)
+endif()
 
+# Files shared between main library and unit test library
 set(Magnum_SRCS
-    Object.cpp
     AbstractImage.cpp
     AbstractTexture.cpp
     AbstractShaderProgram.cpp
@@ -27,21 +28,48 @@ set(Magnum_SRCS
 
     Trade/AbstractImporter.cpp
     Trade/MeshData.cpp
+)
+add_library(MagnumObjects OBJECT ${Magnum_SRCS})
 
+# Files shared between main library and math unit test library
+set(MagnumMath_SRCS
     Math/Math.cpp
 )
+add_library(MagnumMathObjects OBJECT ${MagnumMath_SRCS})
 
-add_library(Magnum SHARED ${Magnum_SRCS})
+if(USE_FPIC)
+    set_target_properties(MagnumObjects PROPERTIES COMPILE_FLAGS -fPIC)
+    set_target_properties(MagnumMathObjects PROPERTIES COMPILE_FLAGS -fPIC)
+endif()
 
-target_link_libraries(Magnum ${CORRADE_UTILITY_LIBRARY} ${CORRADE_PLUGINMANAGER_LIBRARY} ${OPENGL_gl_LIBRARY} ${GLEW_LIBRARY})
+# Files compiled with different flags for main library and unit test library
+set(Magnum_GracefulAssert_SRCS
+    Object.cpp
+)
 
+# Main library
+add_library(Magnum SHARED
+    $<TARGET_OBJECTS:MagnumObjects>
+    $<TARGET_OBJECTS:MagnumMathObjects>
+    ${Magnum_GracefulAssert_SRCS}
+)
+target_link_libraries(Magnum ${CORRADE_UTILITY_LIBRARY} ${CORRADE_PLUGINMANAGER_LIBRARY} ${OPENGL_gl_LIBRARY} ${GLEW_LIBRARY})
 install(TARGETS Magnum DESTINATION ${MAGNUM_LIBRARY_INSTALL_DIR})
 
+add_subdirectory(Math)
+add_subdirectory(MeshTools)
+add_subdirectory(Physics)
+add_subdirectory(Primitives)
+add_subdirectory(Shaders)
+
 if(BUILD_TESTS)
     enable_testing()
 
     # Library with graceful assert for testing
-    add_library(MagnumTestLib SHARED ${Magnum_SRCS})
+    add_library(MagnumTestLib SHARED
+        $<TARGET_OBJECTS:MagnumObjects>
+        ${Magnum_GracefulAssert_SRCS}
+    )
     set_target_properties(MagnumTestLib PROPERTIES COMPILE_FLAGS -DCORRADE_GRACEFUL_ASSERT)
     target_link_libraries(MagnumTestLib ${CORRADE_UTILITY_LIBRARY} ${CORRADE_PLUGINMANAGER_LIBRARY} ${OPENGL_gl_LIBRARY} ${GLEW_LIBRARY})
 

src/Math/CMakeLists.txt

@@ -3,12 +3,6 @@ include_directories(${CMAKE_CURRENT_SOURCE_DIR})
 add_subdirectory(Geometry)
 
 if(BUILD_TESTS)
-
-    # Add Math library for testing purposes
-    add_library(MagnumMath STATIC
-        Math.cpp
-    )
-
     enable_testing()
     add_subdirectory(Test)
 endif()

src/Math/Geometry/CMakeLists.txt

@@ -4,4 +4,3 @@ if(BUILD_TESTS)
     enable_testing()
     add_subdirectory(Test)
 endif()
-

src/Math/Test/CMakeLists.txt

@@ -9,4 +9,6 @@ corrade_add_test(MathMatrixTest MatrixTest.h MatrixTest.cpp ${CORRADE_UTILITY_LI
 corrade_add_test(MathMatrix3Test Matrix3Test.h Matrix3Test.cpp ${CORRADE_UTILITY_LIBRARY})
 corrade_add_test(MathMatrix4Test Matrix4Test.h Matrix4Test.cpp ${CORRADE_UTILITY_LIBRARY})
 
-corrade_add_test(MathTest MathTest.h MathTest.cpp MagnumMath)
+set(MathTest_MOC MathTest.h)
+set(MathTest_SRCS MathTest.cpp $<TARGET_OBJECTS:MagnumMathObjects>)
+corrade_add_multifile_test(MathTest MathTest_MOC MathTest_SRCS)

src/MeshTools/CMakeLists.txt

@@ -1,11 +1,23 @@
+# Files shared between main library and unit test library
 set(MagnumMeshTools_SRCS
-    FlipNormals.cpp
-    GenerateFlatNormals.cpp
     Tipsify.cpp
 )
+add_library(MagnumMeshToolsObjects OBJECT ${MagnumMeshTools_SRCS})
+if(USE_FPIC)
+    set_target_properties(MagnumMeshToolsObjects PROPERTIES COMPILE_FLAGS -fPIC)
+endif()
 
-add_library(MagnumMeshTools SHARED ${MagnumMeshTools_SRCS})
+# Files compiled with different flags for main library and unit test library
+set(MagnumMeshTools_GracefulAssert_SRCS
+    FlipNormals.cpp
+    GenerateFlatNormals.cpp
+)
 
+# Main library
+add_library(MagnumMeshTools SHARED
+    $<TARGET_OBJECTS:MagnumMeshToolsObjects>
+    ${MagnumMeshTools_GracefulAssert_SRCS}
+)
 target_link_libraries(MagnumMeshTools Magnum)
 
 install(TARGETS MagnumMeshTools DESTINATION ${MAGNUM_LIBRARY_INSTALL_DIR})
@@ -14,7 +26,10 @@ if(BUILD_TESTS)
     enable_testing()
 
     # Library with graceful assert for testing
-    add_library(MagnumMeshToolsTestLib SHARED ${MagnumMeshTools_SRCS})
+    add_library(MagnumMeshToolsTestLib SHARED
+        $<TARGET_OBJECTS:MagnumMeshToolsObjects>
+        ${MagnumMeshTools_GracefulAssert_SRCS}
+    )
     set_target_properties(MagnumMeshToolsTestLib PROPERTIES COMPILE_FLAGS -DCORRADE_GRACEFUL_ASSERT)
     target_link_libraries(MagnumMeshToolsTestLib ${MAGNUM_LIBRARY})