Restore --build-dir

news/9193.removal.rst

@@ -0,0 +1,2 @@
+The --build-dir option has been restored as a no-op, to soften the transition
+for tools that still used it.

src/pip/_internal/cli/base_command.py

@@ -199,6 +199,20 @@ class Command(CommandContextMixIn):
                 )
                 options.cache_dir = None
 
+        if getattr(options, "build_dir", None):
+            deprecated(
+                reason=(
+                    "The -b/--build/--build-dir/--build-directory "
+                    "option is deprecated and has no effect anymore."
+                ),
+                replacement=(
+                    "use the TMPDIR/TEMP/TMP environment variable, "
+                    "possibly combined with --no-clean"
+                ),
+                gone_in="21.1",
+                issue=8333,
+            )
+
         if '2020-resolver' in options.features_enabled and not PY2:
             logger.warning(
                 "--use-feature=2020-resolver no longer has any effect, "

src/pip/_internal/cli/cmdoptions.py

@@ -695,6 +695,14 @@ no_deps = partial(
     help="Don't install package dependencies.",
 )  # type: Callable[..., Option]
 
+build_dir = partial(
+    PipOption,
+    '-b', '--build', '--build-dir', '--build-directory',
+    dest='build_dir',
+    type='path',
+    metavar='dir',
+    help=SUPPRESS_HELP,
+)  # type: Callable[..., Option]
 
 ignore_requires_python = partial(
     Option,

src/pip/_internal/commands/download.py

@@ -43,6 +43,7 @@ class DownloadCommand(RequirementCommand):
         # type: () -> None
         self.cmd_opts.add_option(cmdoptions.constraints())
         self.cmd_opts.add_option(cmdoptions.requirements())
+        self.cmd_opts.add_option(cmdoptions.build_dir())
         self.cmd_opts.add_option(cmdoptions.no_deps())
         self.cmd_opts.add_option(cmdoptions.global_options())
         self.cmd_opts.add_option(cmdoptions.no_binary())

src/pip/_internal/commands/install.py

@@ -129,6 +129,8 @@ class InstallCommand(RequirementCommand):
             help="Installation prefix where lib, bin and other top-level "
                  "folders are placed")
 
+        self.cmd_opts.add_option(cmdoptions.build_dir())
+
         self.cmd_opts.add_option(cmdoptions.src())
 
         self.cmd_opts.add_option(

src/pip/_internal/commands/wheel.py

@@ -78,6 +78,7 @@ class WheelCommand(RequirementCommand):
         self.cmd_opts.add_option(cmdoptions.src())
         self.cmd_opts.add_option(cmdoptions.ignore_requires_python())
         self.cmd_opts.add_option(cmdoptions.no_deps())
+        self.cmd_opts.add_option(cmdoptions.build_dir())
         self.cmd_opts.add_option(cmdoptions.progress_bar())
 
         self.cmd_opts.add_option(