vs2010: properly check whether solution needs to be regenerated

mesonbuild/backend/vs2010backend.py

@@ -21,13 +21,13 @@ from .. import mlog
 import xml.etree.ElementTree as ET
 import xml.dom.minidom
 from ..coredata import MesonException
+from ..environment import Environment
 
 class RegenInfo():
-    def __init__(self, source_dir, build_dir, depfiles, solutionfile):
+    def __init__(self, source_dir, build_dir, depfiles):
         self.source_dir = source_dir
         self.build_dir = build_dir
         self.depfiles = depfiles
-        self.solutionfile = solutionfile
 
 class Vs2010Backend(backends.Backend):
     def __init__(self, build):
@@ -92,15 +92,22 @@ 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)
-        open(os.path.join(self.environment.get_scratch_dir(), 'regen.stamp'), 'wb')
+        self.generate_regen_info()
+        Vs2010Backend.touch_regen_timestamp(self.environment.get_build_dir())
 
-    def generate_regen_info(self, sln_filename):
+    @staticmethod
+    def get_regen_stampfile(build_dir):
+        return os.path.join(os.path.join(build_dir, Environment.private_dir), 'regen.stamp')
+
+    @staticmethod
+    def touch_regen_timestamp(build_dir):
+        open(Vs2010Backend.get_regen_stampfile(build_dir), 'w').close()
+
+    def generate_regen_info(self):
         deps = self.get_regen_filelist()
         regeninfo = RegenInfo(self.environment.get_source_dir(),
                               self.environment.get_build_dir(),
-                              deps,
-                              sln_filename)
+                              deps)
         pickle.dump(regeninfo, open(os.path.join(self.environment.get_scratch_dir(), 'regeninfo.dump'), 'wb'))
 
     def get_obj_target_deps(self, obj_list):
@@ -579,7 +586,7 @@ if %%errorlevel%% neq 0 goto :VCEnd'''
         message.text = 'Checking whether solution needs to be regenerated.'
         ET.SubElement(custombuild, 'Command').text = cmd_templ % \
             ('" "'.join(regen_command), private_dir)
-        ET.SubElement(custombuild, 'Outputs').text = os.path.join(self.environment.get_scratch_dir(), 'regen.stamp')
+        ET.SubElement(custombuild, 'Outputs').text = Vs2010Backend.get_regen_stampfile(self.environment.get_build_dir())
         deps = self.get_regen_filelist()
         ET.SubElement(custombuild, 'AdditionalInputs').text = ';'.join(deps)
         ET.SubElement(root, 'Import', Project='$(VCTargetsPath)\Microsoft.Cpp.targets')

mesonbuild/scripts/regen_checker.py

@@ -19,13 +19,18 @@ import pickle, subprocess
 
 # This could also be used for XCode.
 
-def need_regen(regeninfo):
-    sln_time = os.stat(os.path.join(regeninfo.build_dir, regeninfo.solutionfile)).st_mtime
+def need_regen(regeninfo, regen_timestamp):
     for i in regeninfo.depfiles:
         curfile = os.path.join(regeninfo.build_dir, i)
         curtime = os.stat(curfile).st_mtime
-        if curtime > sln_time:
+        if curtime > regen_timestamp:
             return True
+    # The timestamp file gets automatically deleted by MSBuild during a 'Clean' build.
+    # We must make sure to recreate it, even if we do not regenerate the solution.
+    # Otherwise, Visual Studio will always consider the REGEN project out of date.
+    print("Everything is up-to-date, regeneration of build files is not needed.")
+    from mesonbuild.backend.vs2010backend import Vs2010Backend
+    Vs2010Backend.touch_regen_timestamp(regeninfo.build_dir)
     return False
 
 def regen(regeninfo):
@@ -41,8 +46,11 @@ def regen(regeninfo):
     subprocess.check_call(cmd)
 
 def run(args):
-    regeninfo = pickle.load(open(os.path.join(args[0], 'regeninfo.dump'), 'rb'))
-    if need_regen(regeninfo):
+    private_dir = args[0]
+    dumpfile = os.path.join(private_dir, 'regeninfo.dump')
+    regeninfo = pickle.load(open(dumpfile, 'rb'))
+    regen_timestamp = os.stat(dumpfile).st_mtime
+    if need_regen(regeninfo, regen_timestamp):
         regen(regeninfo)
     sys.exit(0)