Specify the ABI version on the command line

The `--abi-version` command line option has been added to `sip-build`,
`sip-install` and `sip-wheel` to specify the ABI version of the `sip`
module to generate code for.

Resolves #64

docs/command_line_tools.rst

@@ -49,6 +49,13 @@ The full set of command line options is:
 
     Verbose progress messages are enabled.
 
+.. option:: --abi-version M[.N]
+
+    The version number of the ABI of the :mod:`sip` module to generate code for
+    is ``M.N``.  By default the latest major version is used.  If the minor
+    version is not specified then the latest minor version of the major version
+    is used.
+
 .. option:: --api-dir DIR
 
     A QScintilla :file:`.api` file is created in ``DIR``.
@@ -258,6 +265,13 @@ The full set of command line options is:
 
     Verbose progress messages are enabled.
 
+.. option:: --abi-version M[.N]
+
+    The version number of the ABI of the :mod:`sip` module to generate code for
+    is ``M.N``.  By default the latest major version is used.  If the minor
+    version is not specified then the latest minor version of the major version
+    is used.
+
 .. option:: --api-dir DIR
 
     A QScintilla :file:`.api` file is created in ``DIR``.
@@ -497,6 +511,13 @@ The full set of command line options is:
 
     Verbose progress messages are enabled.
 
+.. option:: --abi-version M[.N]
+
+    The version number of the ABI of the :mod:`sip` module to generate code for
+    is ``M.N``.  By default the latest major version is used.  If the minor
+    version is not specified then the latest minor version of the major version
+    is used.
+
 .. option:: --api-dir DIR
 
     A QScintilla :file:`.api` file is created in ``DIR``.  This must be a name

docs/pyproject_toml.rst

@@ -97,9 +97,9 @@ list options may contain environment markers as defined in `PEP 508
 
 **abi-version**
     The version number of the ABI of the :mod:`sip` module to generate code
-    for.  By the default the latest major version is used.  If the minor
-    version is not specified then the latest minor version of the major version
-    is used.
+    for.  By default the latest major version is used.  If the minor version is
+    not specified then the latest minor version of the major version is used.
+    There is also a corresponding command line option.
 
 **api-dir**
     The value is the name of a the directory in which a QScintilla :file:`.api`

sipbuild/project.py

@@ -35,9 +35,6 @@ class Project(AbstractProject, Configurable):
 
     # The configurable options.
     _options = (
-        # The minimum required ABI version of the sip module.
-        Option('abi_version'),
-
         # The callable that will return an Bindings instance.  This is used for
         # bindings implicitly defined in the .toml file.
         Option('bindings_factory'),
@@ -106,6 +103,8 @@ class Project(AbstractProject, Configurable):
                 help="enable verbose progress messages"),
         Option('name', help="the name used in sdist and wheel file names",
                 metavar="NAME", tools=['sdist', 'wheel']),
+        Option('abi_version', help="The ABI to generate code for",
+                metavar="M[.N]"),
         Option('build_dir', help="the build directory", metavar="DIR"),
         Option('build_tag', help="the build tag to be used in the wheel name",
                 metavar="TAG", tools=['wheel']),