Regenerator script works, but is not run automatically yet.

backends.py

@@ -333,3 +333,20 @@ class Backend():
         mfobj['projects'] = self.build.dep_manifest
         open(ifilename, 'w').write(json.dumps(mfobj))
         d.data.append([ifilename, ofilename])
+
+    def get_regen_filelist(self):
+        '''List of all files whose alteration means that the build
+        definition needs to be regenerated.'''
+        deps = [os.path.join(self.build_to_src, df) \
+                for df in self.interpreter.get_build_def_files()]
+        if self.environment.is_cross_build():
+            deps.append(os.path.join(self.build_to_src,
+                                     self.environment.coredata.cross_file))
+        deps.append('meson-private/coredata.dat')
+        if os.path.exists(os.path.join(self.environment.get_source_dir(), 'meson_options.txt')):
+            deps.append(os.path.join(self.build_to_src, 'meson_options.txt'))
+        for sp in self.build.subprojects.keys():
+            fname = os.path.join(self.environment.get_source_dir(), sp, 'meson_options.txt')
+            if os.path.isfile(fname):
+                deps.append(os.path.join(self.build_to_src, sp, 'meson_options.txt'))
+        return deps

ninjabackend.py

@@ -21,7 +21,7 @@ from mesonlib import File
 from meson_install import InstallData
 from build import InvalidArguments
 from coredata import MesonException
-import os, sys, shutil, pickle, re
+import os, sys, pickle, re
 
 if mesonlib.is_windows():
     quote_char = '"'
@@ -1613,18 +1613,7 @@ rule FORTRAN_DEP_HACK
         elem.write(outfile)
         self.check_outputs(elem)
 
-        deps = [os.path.join(self.build_to_src, df) \
-                for df in self.interpreter.get_build_def_files()]
-        if self.environment.is_cross_build():
-            deps.append(os.path.join(self.build_to_src,
-                                     self.environment.coredata.cross_file))
-        deps.append('meson-private/coredata.dat')
-        if os.path.exists(os.path.join(self.environment.get_source_dir(), 'meson_options.txt')):
-            deps.append(os.path.join(self.build_to_src, 'meson_options.txt'))
-        for sp in self.build.subprojects.keys():
-            fname = os.path.join(self.environment.get_source_dir(), sp, 'meson_options.txt')
-            if os.path.isfile(fname):
-                deps.append(os.path.join(self.build_to_src, sp, 'meson_options.txt'))
+        deps = self.get_regen_filelist()
         elem = NinjaBuildElement('build.ninja', 'REGENERATE_BUILD', deps)
         elem.add_item('pool', 'console')
         elem.write(outfile)

regen_checker.py

@@ -14,11 +14,29 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import sys
-
-print('I am a script that checks whether VS solution should be regenerated.')
-print('Currently I do nothing.')
+import sys, os
+import pickle, subprocess
 
 # This could also be used for XCode.
 
-sys.exit(0)
+def need_regen(regeninfo):
+    sln_time = os.stat(os.path.join(regeninfo.build_dir, regeninfo.solutionfile)).st_mtime
+    for i in regeninfo.depfiles:
+        curfile = os.path.join(regeninfo.build_dir, i)
+        curtime = os.stat(curfile).st_mtime
+        if curtime > sln_time:
+            return True
+    return False
+
+def regen(regeninfo):
+    scriptdir = os.path.split(__file__)[0]
+    mesonscript = os.path.join(scriptdir, 'meson.py')
+    cmd = [sys.executable, mesonscript, regeninfo.build_dir, regeninfo.source_dir,
+           '--backend=vs2010', 'secret-handshake']
+    subprocess.check_call(cmd)
+
+if __name__ == '__main__':
+    regeninfo = pickle.load(open(os.path.join(sys.argv[1], 'regeninfo.dump'), 'rb'))
+    if need_regen(regeninfo):
+        regen(regeninfo)
+    sys.exit(0)

vs2010backend.py

@@ -13,11 +13,19 @@
 # limitations under the License.
 
 import os, sys
+import pickle
 import backends, build
 import xml.etree.ElementTree as ET
 import xml.dom.minidom
 from coredata import MesonException
 
+class RegenInfo():
+    def __init__(self, source_dir, build_dir, depfiles, solutionfile):
+        self.source_dir = source_dir
+        self.build_dir = build_dir
+        self.depfiles = depfiles
+        self.solutionfile = solutionfile
+
 class Vs2010Backend(backends.Backend):
     def __init__(self, build):
         super().__init__(build)
@@ -70,6 +78,15 @@ class Vs2010Backend(backends.Backend):
         self.gen_testproj('RUN_TESTS', os.path.join(self.environment.get_build_dir(), 'RUN_TESTS.vcxproj'))
         self.gen_regenproj('REGEN', os.path.join(self.environment.get_build_dir(), 'REGEN.vcxproj'))
         self.generate_solution(sln_filename, projlist)
+        self.generate_regen_info(sln_filename)
+
+    def generate_regen_info(self, sln_filename):
+        deps = self.get_regen_filelist()
+        regeninfo = RegenInfo(self.environment.get_source_dir(),
+                              self.environment.get_build_dir(),
+                              deps,
+                              sln_filename)
+        pickle.dump(regeninfo, open(os.path.join(self.environment.get_scratch_dir(), 'regeninfo.dump'), 'wb'))
 
     def get_obj_target_deps(self, obj_list):
         result = {}