cmake: include customlabels in deps

* CMakeLists.txt
* cmake/deps/customlabels.cmake
* include/datadog/tracer_signature.h
* src/datadog/trace_segment.cpp

Author: elsa

CMakeLists.txt

@@ -24,6 +24,11 @@ endif ()
 
 set(DD_TRACE_TRANSPORT "curl" CACHE STRING "HTTP transport that dd-trace-cpp uses to communicate with the Datadog Agent, can be either 'none' or 'curl'")
 
+if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  include(cmake/deps/customlabels.cmake)
+  message(STATUS "customlabels Library is available")
+endif()
+
 if(DD_TRACE_TRANSPORT STREQUAL "curl")
   include(cmake/deps/curl.cmake)
   message(STATUS "DD_TRACE_TRANSPORT is set to 'curl', including curl")
@@ -203,11 +208,17 @@ if (BUILD_SHARED_LIBS)
     PUBLIC
       dd_trace::obj
       CURL::libcurl_shared
-      customlabels
     PRIVATE
       dd_trace::specs
   )
 
+  if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
+   target_link_libraries(dd_trace_cpp-shared
+     PUBLIC
+       customlabels
+   )
+  endif ()
+
   install(TARGETS dd_trace_cpp-objects dd_trace_cpp-shared
     EXPORT dd_trace_cpp-export
     FILE_SET public_headers DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
@@ -250,6 +261,13 @@ if (BUILD_STATIC_LIBS)
       dd_trace::specs
   )
 
+  if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
+   target_link_libraries(dd_trace_cpp-static
+     PUBLIC
+       customlabels
+   )
+  endif ()
+
   install(TARGETS dd_trace_cpp-objects dd_trace_cpp-static
     EXPORT dd_trace_cpp-export
     FILE_SET public_headers DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
@@ -258,3 +276,10 @@ if (BUILD_STATIC_LIBS)
     RUNTIME DESTINATION ${CMAKE_INSTALL_LIBDIR}
   )
 endif ()
+
+if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  target_include_directories(dd_trace_cpp-objects
+  PRIVATE
+    ${customlabels_SOURCE_DIR}/src
+  )
+endif()

cmake/deps/customlabels.cmake

@@ -0,0 +1,17 @@
+include(FetchContent)
+
+FetchContent_Declare(customlabels
+  GIT_REPOSITORY https://github.com/DataDog/custom-labels.git
+  GIT_TAG  elsa/add-process-storage
+)
+
+FetchContent_MakeAvailable(customlabels)
+
+add_library(customlabels SHARED
+  ${customlabels_SOURCE_DIR}/src/customlabels.c
+)
+
+target_include_directories(customlabels
+PUBLIC
+  ${customlabels_SOURCE_DIR}/src
+)

include/datadog/tracer_signature.h

@@ -23,7 +23,7 @@
 #include <cstring>
 #include <vector>
 extern "C" {
-#include <customlabels/customlabels.h>
+#include <customlabels.h>
 }
 #endif
 

src/datadog/trace_segment.cpp

@@ -1,6 +1,6 @@
 #ifdef __linux__
 extern "C" {
-#include <customlabels/customlabels.h>
+#include <customlabels.h>
 }
 #endif