Static link library build and linkage (#268)

* Ignore CMakeSettings.json

* Static build CMake configuration

* Source file variable name change

* Header-only version of spdlog (Resolved linker issues, WIN32)

* RGL_VISIBLE disabled for static

* Corrected spdlog variant

---------

Co-authored-by: Piotr Rybicki <[email protected]>

Author: StubbyRogue46

.gitignore

@@ -41,6 +41,6 @@ cmake-build-release
 build
 external/*
 !external/CMakeLists.txt
-!external/CMakeLists.txt
 extensions/udp
 extensions/snow
+CMakeSettings.json

CMakeLists.txt

@@ -26,6 +26,10 @@ set(RGL_LOG_FILE "" CACHE STRING  # STRING prevents from expanding relative path
 set(RGL_AUTO_TAPE_PATH "" CACHE STRING  # STRING prevents from expanding relative paths
     "If non-empty, defines a path for the automatic tape (started on the first API call)")
 
+# Library configuration
+set(RGL_BUILD_STATIC OFF CACHE BOOL
+    "Builds RobotecGPULidar as a statically linkable library instead of a shared one")
+
 # Test configuration
 set(RGL_BUILD_TESTS ON CACHE BOOL
     "Enables building test. GTest will be automatically downloaded")
@@ -89,7 +93,7 @@ add_custom_command(
     VERBATIM)
 add_library(optixPrograms optixProgramsPtx.c)
 
-add_library(RobotecGPULidar SHARED
+set(RGL_SOURCE_FILES
     src/api/apiCommon.cpp
     src/api/apiCore.cpp
     src/tape/TapePlayer.cpp
@@ -127,6 +131,15 @@ add_library(RobotecGPULidar SHARED
     src/graph/YieldPointsNode.cpp
 )
 
+if (RGL_BUILD_STATIC)
+    add_library(RobotecGPULidar STATIC ${RGL_SOURCE_FILES})
+    target_compile_definitions(RobotecGPULidar PUBLIC RGL_STATIC)
+    set(RGL_SPDLOG_VARIANT spdlog_header_only)
+else ()
+    add_library(RobotecGPULidar SHARED ${RGL_SOURCE_FILES})
+    set(RGL_SPDLOG_VARIANT spdlog)
+endif ()
+
 set_property(TARGET RobotecGPULidar PROPERTY POSITION_INDEPENDENT_CODE ON)
 
 target_compile_definitions(RobotecGPULidar PUBLIC RGL_BUILD_PCL_EXTENSION=$<BOOL:${RGL_BUILD_PCL_EXTENSION}>)
@@ -156,7 +169,7 @@ target_include_directories(RobotecGPULidar
 )
 
 target_link_libraries(RobotecGPULidar PRIVATE
-    spdlog
+    ${RGL_SPDLOG_VARIANT}
     yaml-cpp
     optixPrograms
     cmake_git_version_tracking

include/rgl/api/core.h

@@ -28,6 +28,9 @@
 #define NO_MANGLING
 #endif
 
+#if defined RGL_STATIC
+#define RGL_VISIBLE
+#else
 #if defined _WIN32 || defined __CYGWIN__
 #ifdef __GNUC__
 #define RGL_VISIBLE __attribute__((dllexport))
@@ -42,6 +45,7 @@
 #define RGL_VISIBLE
 #endif
 #endif // _WIN32 || __CYGWIN__
+#endif // RGL_STATIC
 
 #define RGL_API NO_MANGLING RGL_VISIBLE