Merge bitcoin/bitcoin#28622: build: use macOS 14 SDK (Xcode 15.0)

8ea45e626e build: use macOS 14 SDK (Xcode 15.0) (fanquake)
51c97ffb69 build: patch boost process for macOS 14 SDK (fanquake)
423949a13b depends: add -platform_version to macOS build flags (fanquake)

Pull request description:

  This fixes: https://github.com/bitcoin/bitcoin/pull/28349#issuecomment-1748515277 (cross-compiling with C++20 for macOS). See https://developer.apple.com/xcode/cpp/#c++20 for C++20 support in Apples libc++, some features landed with Xcode 14.3, although many more landed with Xcode 15.0.

ACKs for top commit:
  hebasto:
    ACK 8ea45e626e.
  TheCharlatan:
    ACK 8ea45e626e

Tree-SHA512: 274ce2c9b9f8e4d755c07b8d0d4897a7f92708ac64e6afb7a3f75bdb485e863fc7f40badf3a88b129ce36f6cca72f768dc2ed7fba2bdf0bb6da2bf0c8fedee10

depends/hosts/darwin.mk

@@ -1,7 +1,7 @@
 OSX_MIN_VERSION=11.0
-OSX_SDK_VERSION=11.0
-XCODE_VERSION=12.2
-XCODE_BUILD_ID=12B45b
+OSX_SDK_VERSION=14.0
+XCODE_VERSION=15.0
+XCODE_BUILD_ID=15A240d
 LD64_VERSION=711
 
 OSX_SDK=$(SDK_PATH)/Xcode-$(XCODE_VERSION)-$(XCODE_BUILD_ID)-extracted-SDK-with-libcxx-headers
@@ -71,6 +71,10 @@ $(foreach TOOL,$(cctools_TOOLS),$(eval darwin_$(TOOL) = $$(build_prefix)/bin/$$(
 #
 #         Adds the desired paths from the SDK
 #
+#     -platform_version
+#
+#         Indicate to the linker the platform, the oldest supported version,
+#         and the SDK used.
 
 darwin_CC=env -u C_INCLUDE_PATH -u CPLUS_INCLUDE_PATH \
               -u OBJC_INCLUDE_PATH -u OBJCPLUS_INCLUDE_PATH -u CPATH \
@@ -91,6 +95,7 @@ darwin_CXX=env -u C_INCLUDE_PATH -u CPLUS_INCLUDE_PATH \
 
 darwin_CFLAGS=-pipe -std=$(C_STANDARD)
 darwin_CXXFLAGS=-pipe -std=$(CXX_STANDARD)
+darwin_LDFLAGS=-Wl,-platform_version,macos,$(OSX_MIN_VERSION),$(OSX_SDK_VERSION)
 
 ifneq ($(LTO),)
 darwin_CFLAGS += -flto

depends/packages/boost.mk

@@ -3,6 +3,11 @@ $(package)_version=1.81.0
 $(package)_download_path=https://boostorg.jfrog.io/artifactory/main/release/$($(package)_version)/source/
 $(package)_file_name=boost_$(subst .,_,$($(package)_version)).tar.bz2
 $(package)_sha256_hash=71feeed900fbccca04a3b4f2f84a7c217186f28a940ed8b7ed4725986baf99fa
+$(package)_patches=process_macos_sdk.patch
+
+define $(package)_preprocess_cmds
+  patch -p1 < $($(package)_patch_dir)/process_macos_sdk.patch
+endef
 
 define $(package)_stage_cmds
   mkdir -p $($(package)_staging_prefix_dir)/include && \

depends/patches/boost/process_macos_sdk.patch

@@ -0,0 +1,27 @@
+Fix Boost Process compilation with macOS 14 SDK.
+Can be dropped with Boost 1.84.0.
+https://github.com/boostorg/process/pull/343.
+https://github.com/boostorg/process/issues/342.
+
+diff --git a/boost/process/detail/posix/handles.hpp b/boost/process/detail/posix/handles.hpp
+index cd9e1ce5a..304e77b1c 100644
+--- a/boost/process/detail/posix/handles.hpp
++++ b/boost/process/detail/posix/handles.hpp
+@@ -33,7 +33,7 @@ inline std::vector<native_handle_type> get_handles(std::error_code & ec)
+     else
+         ec.clear();
+ 
+-    auto my_fd = ::dirfd(dir.get());
++    auto my_fd = dirfd(dir.get());
+ 
+     struct ::dirent * ent_p;
+ 
+@@ -117,7 +117,7 @@ struct limit_handles_ : handler_base_ext
+             return;
+         }
+ 
+-        auto my_fd = ::dirfd(dir);
++        auto my_fd = dirfd(dir);
+         struct ::dirent * ent_p;
+ 
+         while ((ent_p = readdir(dir)) != nullptr)