waf: disable-python - add option globally to build system

This commit adds --disable-python as an option to the build system.
It adds PYTHON_BUILD_IS_ENABLED() to bld, to be used with enabled=
on other modules, and adjusts SAMBA_PYTHON() to set enabled=False
if PYTHON_BUILD_IS_ENABLED() is false.

Signed-off-by: Ian Stakenvicius <axs@gentoo.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>

2 files changed, 37 insertions, 1 deletions

diff --git a/buildtools/wafsamba/samba_python.py b/buildtools/wafsamba/samba_python.py
index bba059edf98..40b42fcf79a 100644
--- a/buildtools/wafsamba/samba_python.py
+++ b/buildtools/wafsamba/samba_python.py
@@ -40,6 +40,18 @@ def SAMBA_CHECK_PYTHON(conf, mandatory=True, version=(2,4,2)):
 
 @conf
 def SAMBA_CHECK_PYTHON_HEADERS(conf, mandatory=True):
+    if conf.env.disable_python:
+        if mandatory:
+            raise Utils.WafError("Cannot check for python headers when "
+                                 "--disable-python specified")
+
+        conf.msg("python headers", "Check disabled due to --disable-python")
+        # we don't want PYTHONDIR in config.h, as otherwise changing
+        # --prefix causes a complete rebuild
+        del(conf.env.defines['PYTHONDIR'])
+        del(conf.env.defines['PYTHONARCHDIR'])
+        return
+
     if conf.env["python_headers_checked"] == []:
         if conf.env['EXTRA_PYTHON']:
             conf.setenv('extrapython')
@@ -79,6 +91,12 @@ def _check_python_headers(conf, mandatory):
         conf.env['PYTHON_SO_ABI_FLAG'].replace('_', '-'))
 
 
+def PYTHON_BUILD_IS_ENABLED(self):
+    return self.CONFIG_SET('HAVE_PYTHON_H')
+
+Build.BuildContext.PYTHON_BUILD_IS_ENABLED = PYTHON_BUILD_IS_ENABLED
+
+
 def SAMBA_PYTHON(bld, name,
                  source='',
                  deps='',
@@ -93,6 +111,11 @@ def SAMBA_PYTHON(bld, name,
                  enabled=True):
     '''build a python extension for Samba'''
 
+    # force-disable when we can't build python modules, so
+    # every single call doesn't need to pass this in.
+    if not bld.PYTHON_BUILD_IS_ENABLED():
+        enabled = False
+
     if bld.env['IS_EXTRA_PYTHON']:
         name = 'extra-' + name
 
@@ -140,7 +163,10 @@ Build.BuildContext.SAMBA_PYTHON = SAMBA_PYTHON
 
 
 def pyembed_libname(bld, name, extrapython=False):
-    return name + bld.env['PYTHON_SO_ABI_FLAG']
+    if bld.env['PYTHON_SO_ABI_FLAG']:
+        return name + bld.env['PYTHON_SO_ABI_FLAG']
+    else:
+        return name
 
 Build.BuildContext.pyembed_libname = pyembed_libname
 
diff --git a/buildtools/wafsamba/wscript b/buildtools/wafsamba/wscript
index fcaaf1b792e..4eef008cf88 100644
--- a/buildtools/wafsamba/wscript
+++ b/buildtools/wafsamba/wscript
@@ -196,6 +196,10 @@ def set_options(opt):
                    help='tag release in git at the same time',
                    type='string', action='store', dest='TAG_RELEASE')
 
+    opt.add_option('--disable-python',
+                    help='do not generate python modules',
+                    action='store_true', dest='disable_python', default=False)
+
     opt.add_option('--extra-python', type=str,
                     help=("build selected libraries for the specified "
                           "additional version of Python "
@@ -279,8 +283,14 @@ def configure(conf):
     conf.env.AUTOCONF_HOST  = Options.options.AUTOCONF_HOST
     conf.env.AUTOCONF_PROGRAM_PREFIX = Options.options.AUTOCONF_PROGRAM_PREFIX
 
+    conf.env.disable_python = Options.options.disable_python
+
     conf.env.EXTRA_PYTHON = Options.options.EXTRA_PYTHON
 
+    if (conf.env.disable_python and conf.env.EXTRA_PYTHON):
+        Logs.error('ERROR: cannot specify both --disable-python and --extra-python.')
+        sys.exit(1)
+
     if (conf.env.AUTOCONF_HOST and
         conf.env.AUTOCONF_BUILD and
         conf.env.AUTOCONF_BUILD != conf.env.AUTOCONF_HOST):