build: include procinfo.c impl for macOS

Include an implementation of trace2_collect_process_info for macOS.

Signed-off-by: Matthew John Cheetham <mjcheetham@outlook.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

config.mak.uname

@@ -148,6 +148,8 @@ ifeq ($(uname_S),Darwin)
 	HAVE_NS_GET_EXECUTABLE_PATH = YesPlease
 	CSPRNG_METHOD = arc4random
 	USE_ENHANCED_BASIC_REGULAR_EXPRESSIONS = YesPlease
+	HAVE_PLATFORM_PROCINFO = YesPlease
+	COMPAT_OBJS += compat/darwin/procinfo.o
 
 	# Workaround for `gettext` being keg-only and not even being linked via
 	# `brew link --force gettext`, should be obsolete as of

contrib/buildsystems/CMakeLists.txt

@@ -274,6 +274,8 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
 	add_compile_definitions(PROCFS_EXECUTABLE_PATH="/proc/self/exe" HAVE_DEV_TTY )
 	list(APPEND compat_SOURCES unix-socket.c unix-stream-server.c compat/linux/procinfo.c)
+elseif(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+	list(APPEND compat_SOURCES compat/darwin/procinfo.c)
 endif()
 
 if(CMAKE_SYSTEM_NAME STREQUAL "Windows")

meson.build

@@ -1292,6 +1292,8 @@ if host_machine.system() == 'linux'
   libgit_sources += 'compat/linux/procinfo.c'
 elif host_machine.system() == 'windows'
   libgit_sources += 'compat/win32/trace2_win32_process_info.c'
+elif host_machine.system() == 'darwin'
+  libgit_sources += 'compat/darwin/procinfo.c'
 else
   libgit_sources += 'compat/stub/procinfo.c'
 endif