cmake: Add introspection module

Co-authored-by: Cory Fields <cory-nospam-@coryfields.com> Co-authored-by: Vasil Dimov <vd@FreeBSD.org>
2025-11-27 22:42:34 +01:00 · 2024-03-23 16:50:57 +00:00
parent 27d687fc1f
commit 07069e2bb0
5 changed files with 365 additions and 0 deletions
--- a/cmake/module/TestAppendRequiredLibraries.cmake
+++ b/cmake/module/TestAppendRequiredLibraries.cmake
@@ -0,0 +1,92 @@
+# Copyright (c) 2023-present The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or https://opensource.org/license/mit/.
+
+include_guard(GLOBAL)
+
+# Illumos/SmartOS requires linking with -lsocket if
+# using getifaddrs & freeifaddrs.
+# See:
+# - https://github.com/bitcoin/bitcoin/pull/21486
+# - https://smartos.org/man/3socket/getifaddrs
+function(test_append_socket_library target)
+  if (NOT TARGET ${target})
+    message(FATAL_ERROR "${CMAKE_CURRENT_FUNCTION}() called with non-existent target \"${target}\".")
+  endif()
+
+  set(check_socket_source "
+    #include <sys/types.h>
+    #include <ifaddrs.h>
+
+    int main() {
+      struct ifaddrs* ifaddr;
+      getifaddrs(&ifaddr);
+      freeifaddrs(ifaddr);
+    }
+  ")
+
+  include(CheckSourceCompilesAndLinks)
+  check_cxx_source_links("${check_socket_source}" IFADDR_LINKS_WITHOUT_LIBSOCKET)
+  if(NOT IFADDR_LINKS_WITHOUT_LIBSOCKET)
+    check_cxx_source_links_with_libs(socket "${check_socket_source}" IFADDR_NEEDS_LINK_TO_LIBSOCKET)
+    if(IFADDR_NEEDS_LINK_TO_LIBSOCKET)
+      target_link_libraries(${target} INTERFACE socket)
+    else()
+      message(FATAL_ERROR "Cannot figure out how to use getifaddrs/freeifaddrs.")
+    endif()
+  endif()
+  set(HAVE_DECL_GETIFADDRS TRUE PARENT_SCOPE)
+  set(HAVE_DECL_FREEIFADDRS TRUE PARENT_SCOPE)
+endfunction()
+
+# Clang, when building for 32-bit,
+# and linking against libstdc++, requires linking with
+# -latomic if using the C++ atomic library.
+# Can be tested with: clang++ -std=c++20 test.cpp -m32
+#
+# Sourced from http://bugs.debian.org/797228
+function(test_append_atomic_library target)
+  if (NOT TARGET ${target})
+    message(FATAL_ERROR "${CMAKE_CURRENT_FUNCTION}() called with non-existent target \"${target}\".")
+  endif()
+
+  set(check_atomic_source "
+    #include <atomic>
+    #include <cstdint>
+    #include <chrono>
+
+    using namespace std::chrono_literals;
+
+    int main() {
+      std::atomic<bool> lock{true};
+      lock.exchange(false);
+
+      std::atomic<std::chrono::seconds> t{0s};
+      t.store(2s);
+      auto t1 = t.load();
+      t.compare_exchange_strong(t1, 3s);
+
+      std::atomic<double> d{};
+      d.store(3.14);
+      auto d1 = d.load();
+
+      std::atomic<int64_t> a{};
+      int64_t v = 5;
+      int64_t r = a.fetch_add(v);
+      return static_cast<int>(r);
+    }
+  ")
+
+  include(CheckSourceCompilesAndLinks)
+  check_cxx_source_links("${check_atomic_source}" STD_ATOMIC_LINKS_WITHOUT_LIBATOMIC)
+  if(STD_ATOMIC_LINKS_WITHOUT_LIBATOMIC)
+    return()
+  endif()
+
+  check_cxx_source_links_with_libs(atomic "${check_atomic_source}" STD_ATOMIC_NEEDS_LINK_TO_LIBATOMIC)
+  if(STD_ATOMIC_NEEDS_LINK_TO_LIBATOMIC)
+    target_link_libraries(${target} INTERFACE atomic)
+  else()
+    message(FATAL_ERROR "Cannot figure out how to use std::atomic.")
+  endif()
+endfunction()