Gate Source Link on pipeline builds only

Only generate sourcelink.json and pass /SOURCELINK to the linker when
PIPELINE_BUILD_ID is defined (i.e. during CI pipeline builds). This
avoids unnecessary Source Link artifacts in local developer builds.

Co-authored-by: Copilot <[email protected]>

Author: Ben Hillis

CMakeLists.txt

@@ -156,9 +156,11 @@ file(MAKE_DIRECTORY ${BIN})
 set (GENERATED_DIR ${CMAKE_BINARY_DIR}/generated)
 file(MAKE_DIRECTORY ${GENERATED_DIR})
 
-# Generate Source Link JSON so debuggers can fetch source from GitHub
-set(SOURCELINK_JSON "${GENERATED_DIR}/sourcelink.json")
-file(WRITE "${SOURCELINK_JSON}" "{\"documents\":{\"${CMAKE_SOURCE_DIR}/*\":\"https://raw.githubusercontent.com/microsoft/WSL/${COMMIT_HASH}/*\"}}")
+# Generate Source Link JSON so debuggers can fetch source from GitHub (pipeline builds only)
+if (DEFINED PIPELINE_BUILD_ID)
+    set(SOURCELINK_JSON "${GENERATED_DIR}/sourcelink.json")
+    file(WRITE "${SOURCELINK_JSON}" "{\"documents\":{\"${CMAKE_SOURCE_DIR}/*\":\"https://raw.githubusercontent.com/microsoft/WSL/${COMMIT_HASH}/*\"}}")
+endif()
 
 set(PACKAGE_CERTIFICATE ${GENERATED_DIR}/dev-cert.pfx)
 file(CREATE_LINK ${WSL_DEVICE_HOST_SOURCE_DIR}/bin/${TARGET_PLATFORM}/wsldevicehost.dll ${BIN}/wsldevicehost.dll)
@@ -236,8 +238,10 @@ set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Zi /guard:cf /Qspectre"
 # Linker flags
 set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /debug:full /debugtype:cv,fixup /guard:cf /DYNAMICBASE")
 set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /debug:full /debugtype:cv,fixup /guard:cf /DYNAMICBASE")
-set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /SOURCELINK:\"${SOURCELINK_JSON}\"")
-set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /SOURCELINK:\"${SOURCELINK_JSON}\"")
+if (DEFINED SOURCELINK_JSON)
+    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /SOURCELINK:\"${SOURCELINK_JSON}\"")
+    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /SOURCELINK:\"${SOURCELINK_JSON}\"")
+endif()
 if (${TARGET_PLATFORM} STREQUAL "x64")
     set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /CETCOMPAT")
     set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /CETCOMPAT")