From fda4ff3c2389a5a8b57d44fd9be715ade37d576e Mon Sep 17 00:00:00 2001
From: Robin Voetter <rvoetter@amd.com>
Date: Sat, 4 Apr 2026 22:01:44 +0000
Subject: [PATCH] [rocprofiler-sdk] Allow using system json dependency

This adds a new option, ROCPROFILER_BUILD_JSON, which can be set to OFF to
make rocprofiler-sdk use a system dependency for nlohmann_json instead of trying
to build it manually. To mimick old behavior, ROCPROFILER_BUILD_JSON is set to
ON by default.

Related: https://github.com/ROCm/rocm-systems/pull/2319
---
 cmake/rocprofiler_options.cmake |  2 ++
 external/CMakeLists.txt         | 27 ++++++++++++++++-----------
 2 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/cmake/rocprofiler_options.cmake b/cmake/rocprofiler_options.cmake
index 077898a520..e35a41c95c 100644
--- a/cmake/rocprofiler_options.cmake
+++ b/cmake/rocprofiler_options.cmake
@@ -71,6 +71,8 @@ rocprofiler_add_option(ROCPROFILER_BUILD_ELFIO "Enable building ELFIO library in
                        ON)
 rocprofiler_add_option(ROCPROFILER_BUILD_OTF2 "Enable building OTF2 library internally"
                        ON)
+rocprofiler_add_option(ROCPROFILER_BUILD_JSON "Enable building JSON library internally"
+                       ON)
 if(ROCPROFILER_BUILD_TESTS)
     rocprofiler_add_option(
         ROCPROFILER_BUILD_GTEST
diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
index 0c5d4e5fe5..b943be5ad6 100644
--- a/external/CMakeLists.txt
+++ b/external/CMakeLists.txt
@@ -235,20 +235,25 @@ else()
     target_link_libraries(otf2 INTERFACE PkgConfig::OTF2)
 endif()
 
-rocprofiler_checkout_git_submodule(
-    RECURSIVE
-    RELATIVE_PATH external/json
-    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
-    REPO_URL https://github.com/nlohmann/json.git
-    REPO_BRANCH "develop")
-
 #
 # JSON
 #
-add_subdirectory(json)
-target_include_directories(
-    rocprofiler-sdk-json SYSTEM
-    INTERFACE $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/external/json/include>)
+if(ROCPROFILER_BUILD_JSON)
+    rocprofiler_checkout_git_submodule(
+        RECURSIVE
+        RELATIVE_PATH external/json
+        WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+        REPO_URL https://github.com/nlohmann/json.git
+        REPO_BRANCH "develop")
+
+    add_subdirectory(json)
+    target_include_directories(
+        rocprofiler-sdk-json SYSTEM
+        INTERFACE $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/external/json/include>)
+else()
+    find_package(nlohmann_json REQUIRED GLOBAL)
+    target_link_libraries(rocprofiler-sdk-json INTERFACE nlohmann_json::nlohmann_json)
+endif()
 
 #
 # SQLite3
-- 
2.43.0