Feat/compile time wrap check

libs/core/config/CMakeLists.txt

@@ -27,6 +27,7 @@ set(config_macro_headers
     hpx/config/forward.hpp
     hpx/config/manual_profiling.hpp
     hpx/config/move.hpp
+    hpx/config/static_linker_check.hpp
     hpx/config/threads_stack.hpp
     hpx/config/warnings_prefix.hpp
     hpx/config/warnings_suffix.hpp

libs/core/config/include/hpx/config/static_linker_check.hpp

@@ -0,0 +1,20 @@
+//  Copyright (c) 2026 The STE||AR-Group
+//
+//  SPDX-License-Identifier: BSL-1.0
+//  Distributed under the Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// hpxinspect:linelength
+#pragma once
+
+#include <hpx/config/defines.hpp>
+
+#if defined(HPX_HAVE_DYNAMIC_HPX_MAIN)
+#if (defined(__linux) || defined(__linux__) || defined(linux) ||               \
+    defined(__APPLE__)) &&                                                     \
+    defined(HPX_HAVE_STATIC_LINKING) &&                                        \
+    !defined(HPX_HAVE_WRAP_MAIN_CONFIGURED)
+#warning                                                                       \
+    "You are statically linking HPX on Linux/macOS while using hpx_main.hpp. Please ensure you manually configure the linker to use wrap_main, or use the CMake target HPX::wrap_main to avoid linking errors."
+#endif
+#endif

libs/core/include_local/CMakeLists.txt

@@ -15,6 +15,7 @@ set(include_local_headers
     hpx/format.hpp
     hpx/functional.hpp
     hpx/generator.hpp
+    hpx/local.hpp
     hpx/memory.hpp
     hpx/mutex.hpp
     hpx/numeric.hpp

libs/core/include_local/include/hpx/local.hpp

@@ -0,0 +1,36 @@
+//  Copyright (c) 2020-2026 The STE||AR-Group
+//
+//  SPDX-License-Identifier: BSL-1.0
+//  Distributed under the Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+/// \file hpx/local.hpp
+/// \brief Single-include convenience header for single-node HPX usage.
+///
+/// This header bundles the **Standard Parallel Toolkit** -- the most commonly
+/// used HPX facilities for local (single-node) execution:
+///
+///   - \c hpx/modules/algorithms.hpp -- Parallel algorithms (for_each, sort, ...)
+///   - \c hpx/modules/execution.hpp  -- Execution policies (par, par_unseq, seq)
+///   - \c hpx/modules/futures.hpp    -- Futures and dataflow
+///   - \c hpx/numeric.hpp            -- Parallel numeric (reduce, transform_reduce, ...)
+///
+/// **Selection criteria**: each header is part of the HPX core module,
+/// provides ISO C++ Standard Library parallel equivalents, and has no
+/// dependency on the distributed runtime or networking layer.
+///
+/// \note  This header intentionally does NOT include hpx/hpx_main.hpp.
+///        Including hpx_main.hpp has observable side effects: it emits
+///        non-weak symbol definitions and redefines 'main' via a
+///        preprocessor macro. Users who need the zero-boilerplate HPX
+///        runtime entry-point should include hpx/hpx_main.hpp explicitly.
+
+#pragma once
+
+#include <hpx/config.hpp>
+
+// --- Standard Parallel Toolkit (core, no networking dependency) ---
+#include <hpx/modules/algorithms.hpp>
+#include <hpx/modules/execution.hpp>
+#include <hpx/modules/futures.hpp>
+#include <hpx/numeric.hpp>

libs/core/include_local/tests/unit/CMakeLists.txt

@@ -1,5 +1,26 @@
-# Copyright (c) 2020-2021 The STE||AR-Group
+# Copyright (c) 2026 The STE||AR-Group
 #
 # SPDX-License-Identifier: BSL-1.0
 # Distributed under the Boost Software License, Version 1.0. (See accompanying
 # file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+set(tests local_header)
+
+set(local_header_FLAGS NOLIBS DEPENDENCIES HPX::hpx HPX::wrap_main)
+
+foreach(test ${tests})
+  set(sources ${test}.cpp)
+
+  source_group("Source Files" FILES ${sources})
+
+  set(folder_name "Tests/Unit/Modules/Core/IncludeLocal")
+
+  add_hpx_executable(
+    ${test}_test INTERNAL_FLAGS
+    SOURCES ${sources} ${${test}_FLAGS}
+    EXCLUDE_FROM_ALL
+    FOLDER ${folder_name}
+  )
+
+  add_hpx_unit_test("modules.include_local" ${test} ${${test}_PARAMETERS})
+endforeach()

libs/core/include_local/tests/unit/local_header.cpp

@@ -0,0 +1,42 @@
+//  Copyright (c) 2020-2026 The STE||AR-Group
+//
+//  SPDX-License-Identifier: BSL-1.0
+//  Distributed under the Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// Verify that hpx/local.hpp provides access to the Standard Parallel Toolkit:
+// parallel algorithms, numeric algorithms, and execution policies.
+//
+// We use hpx::local::init to drive the HPX runtime without requiring any
+// dependency on the wrap module (hpx_main.hpp / HPX::wrap_main).
+
+#include <hpx/config.hpp>
+#include <hpx/init.hpp>
+#include <hpx/local.hpp>
+
+#include <cstddef>
+#include <iostream>
+#include <numeric>
+#include <vector>
+
+int test_main(int argc, char* argv[])
+{
+    // 1. Verify parallel algorithms are reachable via hpx/local.hpp
+    std::vector<int> v(100);
+    std::iota(v.begin(), v.end(), 1);
+
+    hpx::for_each(
+        hpx::execution::par, v.begin(), v.end(), [](int& x) { x *= 2; });
+
+    // 2. Verify numeric algorithms are reachable
+    int sum = hpx::reduce(hpx::execution::par, v.begin(), v.end(), 0);
+
+    std::cout << "reduce sum: " << sum << std::endl;
+
+    return hpx::local::finalize();
+}
+
+int main(int argc, char* argv[])
+{
+    return hpx::local::init(test_main, argc, argv);
+}

wrap/CMakeLists.txt

@@ -134,7 +134,11 @@ endif()
 if(HPX_WITH_DYNAMIC_HPX_MAIN)
   if("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
     target_link_libraries(hpx_wrap INTERFACE "-Wl,-wrap=main")
+    target_compile_definitions(hpx_wrap INTERFACE HPX_HAVE_WRAP_MAIN_CONFIGURED)
     target_link_libraries(hpx_auto_wrap INTERFACE "-Wl,-wrap=main")
+    target_compile_definitions(
+      hpx_auto_wrap INTERFACE HPX_HAVE_WRAP_MAIN_CONFIGURED
+    )
   elseif(APPLE)
     target_link_libraries(hpx_wrap INTERFACE "-Wl,-e,_initialize_main")
     target_link_libraries(hpx_auto_wrap INTERFACE "-Wl,-e,_initialize_main")

wrap/include/hpx/hpx_main.hpp

@@ -7,6 +7,7 @@
 
 #pragma once
 
+#include <hpx/config/static_linker_check.hpp>
 #include <hpx/wrap_main.hpp>
 
 #if defined(HPX_HAVE_RUN_MAIN_EVERYWHERE)