Build: add binary I/O files to Unix build

Adds binary_io_writer.c and binary_io_reader.c to the _remote_debugging
module compilation. Also hooks up optional zstd support: when libzstd
is found by pkg-config, the module compiles with HAVE_ZSTD defined and
links against libzstd. Without zstd, the module still builds but
compression is unavailable.

Modules/Setup.stdlib.in

@@ -41,7 +41,7 @@
 @MODULE__PICKLE_TRUE@_pickle _pickle.c
 @MODULE__QUEUE_TRUE@_queue _queuemodule.c
 @MODULE__RANDOM_TRUE@_random _randommodule.c
-@MODULE__REMOTE_DEBUGGING_TRUE@_remote_debugging _remote_debugging/module.c _remote_debugging/object_reading.c _remote_debugging/code_objects.c _remote_debugging/frames.c _remote_debugging/frame_cache.c _remote_debugging/threads.c _remote_debugging/asyncio.c
+@MODULE__REMOTE_DEBUGGING_TRUE@_remote_debugging _remote_debugging/module.c _remote_debugging/object_reading.c _remote_debugging/code_objects.c _remote_debugging/frames.c _remote_debugging/frame_cache.c _remote_debugging/threads.c _remote_debugging/asyncio.c _remote_debugging/binary_io_writer.c _remote_debugging/binary_io_reader.c
 @MODULE__STRUCT_TRUE@_struct _struct.c
 
 # build supports subinterpreters

configure.ac

@@ -5529,6 +5529,18 @@ PKG_CHECK_MODULES([LIBZSTD], [libzstd >= 1.4.5], [have_libzstd=yes], [
   ])
 ])
 
+dnl _remote_debugging module: optional zstd compression support
+dnl The module always builds, but zstd compression is only available when libzstd is found
+AS_VAR_IF([have_libzstd], [yes], [
+  REMOTE_DEBUGGING_CFLAGS="-DHAVE_ZSTD $LIBZSTD_CFLAGS"
+  REMOTE_DEBUGGING_LIBS="$LIBZSTD_LIBS"
+], [
+  REMOTE_DEBUGGING_CFLAGS=""
+  REMOTE_DEBUGGING_LIBS=""
+])
+AC_SUBST([REMOTE_DEBUGGING_CFLAGS])
+AC_SUBST([REMOTE_DEBUGGING_LIBS])
+
 dnl PY_CHECK_NETDB_FUNC(FUNCTION)
 AC_DEFUN([PY_CHECK_NETDB_FUNC], [PY_CHECK_FUNC([$1], [@%:@include <netdb.h>])])
 
@@ -7911,7 +7923,7 @@ PY_STDLIB_MOD_SIMPLE([_pickle])
 PY_STDLIB_MOD_SIMPLE([_posixsubprocess])
 PY_STDLIB_MOD_SIMPLE([_queue])
 PY_STDLIB_MOD_SIMPLE([_random])
-PY_STDLIB_MOD_SIMPLE([_remote_debugging])
+PY_STDLIB_MOD_SIMPLE([_remote_debugging], [$REMOTE_DEBUGGING_CFLAGS], [$REMOTE_DEBUGGING_LIBS])
 PY_STDLIB_MOD_SIMPLE([select])
 PY_STDLIB_MOD_SIMPLE([_struct])
 PY_STDLIB_MOD_SIMPLE([_types])