Bug 1399870 - make DEFFILE a Path instead of a string; r=gps

All but one of the current uses of DEFFILE use `SRCDIR + '/file.def'` to
get a srcdir-relative path anyway, and the other one wants an
objdir-relative path, so using Path makes everything clearer.

This makes it more straightforward to translate the paths for the WSL
build.

accessible/interfaces/ia2/moz.build

@@ -8,7 +8,7 @@ GeckoSharedLibrary('IA2Marshal', linkage=None)
 
 DEFINES['REGISTER_PROXY_DLL'] = True
 
-DEFFILE = SRCDIR + '/IA2Marshal.def'
+DEFFILE = 'IA2Marshal.def'
 
 OS_LIBS += [
     'uuid',

accessible/interfaces/msaa/moz.build

@@ -18,7 +18,7 @@ DEFINES['REGISTER_PROXY_DLL'] = True
 # of AccessibleMarshal.dll.
 DEFINES['PROXY_CLSID'] = 'IID_ISimpleDOMNode'
 
-DEFFILE = SRCDIR + '/AccessibleMarshal.def'
+DEFFILE = 'AccessibleMarshal.def'
 
 OS_LIBS += [
     'kernel32',

accessible/ipc/win/handler/moz.build

@@ -37,7 +37,7 @@ GENERATED_FILES += [
     'HandlerData_p.c',
 ]
 
-DEFFILE = SRCDIR + '/AccessibleHandler.def'
+DEFFILE = 'AccessibleHandler.def'
 
 USE_LIBS += [
     'mscom_oop',

build/win32/crashinjectdll/moz.build

@@ -10,7 +10,7 @@ SOURCES += [
 
 SharedLibrary('crashinjectdll')
 
-DEFFILE = SRCDIR + '/crashinjectdll.def'
+DEFFILE = 'crashinjectdll.def'
 
 USE_STATIC_LIBS = True
 NO_PGO = True

config/rules.mk

@@ -153,9 +153,6 @@ CODFILE=$(basename $(@F)).cod
 endif
 
 endif # !GNU_CC
-
-EXTRA_DEPS += $(DEFFILE)
-
 endif # WINNT
 
 ifeq (arm-Darwin,$(CPU_ARCH)-$(OS_TARGET))

dom/plugins/test/testplugin/testplugin.mozbuild

@@ -42,7 +42,7 @@ NO_PGO = True
 if CONFIG['MOZ_WIDGET_TOOLKIT'] == 'windows':
     RCFILE  = 'nptest.rc'
     RESFILE = 'nptest.res'
-    DEFFILE = SRCDIR + '/nptest.def'
+    DEFFILE = 'nptest.def'
 
 if CONFIG['MOZ_WIDGET_TOOLKIT'] == 'cocoa' and '64' in CONFIG['OS_TEST']:
     OS_LIBS += ['-framework Carbon']

gfx/angle/targets/libEGL/moz.build

@@ -153,6 +153,6 @@ OS_LIBS += [
 #    '/WX',
 #]
 
-DEFFILE = SRCDIR + '/../../checkout/src/libEGL/libEGL.def'
+DEFFILE = '../../checkout/src/libEGL/libEGL.def'
 RCFILE = '../../checkout/src/libEGL/libEGL.rc'
 GeckoSharedLibrary('libEGL', linkage=None)

gfx/angle/targets/libGLESv2/moz.build

@@ -171,6 +171,6 @@ OS_LIBS += [
 #    '/WX',
 #]
 
-DEFFILE = SRCDIR + '/../../checkout/src/libGLESv2/libGLESv2_autogen.def'
+DEFFILE = '../../checkout/src/libGLESv2/libGLESv2_autogen.def'
 RCFILE = '../../checkout/src/libGLESv2/libGLESv2.rc'
 GeckoSharedLibrary('libGLESv2', linkage=None)

gfx/angle/update-angle.py

@@ -509,7 +509,7 @@ def export_target(root):
             total_used_files.add(def_path)
 
             def_rel_path = list(fixup_paths([def_path]))[0]
-            extras['DEFFILE'] = "SRCDIR + '/{}'".format(def_rel_path)
+            extras['DEFFILE'] = "'{}'".format(def_rel_path)
 
     os_libs = list(map( lambda x: x[:-len('.lib')], set(accum_desc.get('libs', [])) ))
 

modules/pdfium/moz.build

@@ -562,4 +562,4 @@ AllowCompilerWarnings()
 GeckoSharedLibrary('pdfium', linkage=None)
 
 if CONFIG['OS_TARGET'] == 'WINNT':
-    DEFFILE = SRCDIR + '/pdfium.def'
+    DEFFILE = 'pdfium.def'

mozglue/build/moz.build

@@ -30,7 +30,7 @@ if CONFIG['MOZ_UBSAN']:
     ]
 
 if CONFIG['OS_TARGET'] == 'WINNT':
-    DEFFILE = 'mozglue.def'
+    DEFFILE = '!mozglue.def'
     # We'll break the DLL blocklist if we immediately load user32.dll
     DELAYLOAD_DLLS += [
         'user32.dll',

python/mozbuild/mozbuild/frontend/context.py

@@ -1614,7 +1614,7 @@ VARIABLES = {
         This variable can only be used on Windows.
         """),
 
-    'DEFFILE': (unicode, unicode,
+    'DEFFILE': (Path, unicode,
         """The program .def (module definition) file.
 
         This variable can only be used on Windows.

python/mozbuild/mozbuild/frontend/emitter.py

@@ -1036,7 +1036,6 @@ class TreeMetadataEmitter(LoggingMixin):
             'RCFILE',
             'RESFILE',
             'RCINCLUDE',
-            'DEFFILE',
             'WIN32_EXE_LDFLAGS',
             'USE_EXTENSION_MANIFEST',
             'NO_JS_MANIFEST',
@@ -1067,13 +1066,28 @@ class TreeMetadataEmitter(LoggingMixin):
         if 'LDFLAGS' in context and context['LDFLAGS']:
             computed_link_flags.resolve_flags('MOZBUILD', context['LDFLAGS'])
 
-        deffile = context['DEFFILE']
-        if deffile and context.config.substs.get('OS_ARCH') == 'WINNT':
+        deffile = context.get('DEFFILE')
+        if deffile and context.config.substs.get('OS_TARGET') == 'WINNT':
+            if isinstance(deffile, SourcePath):
+                if not os.path.exists(deffile.full_path):
+                    raise SandboxValidationError(
+                        'Path specified in DEFFILE does not exist: %s '
+                        '(resolved to %s)' % (deffile,
+                        deffile.full_path), context)
+                path = mozpath.relpath(deffile.full_path, context.objdir)
+            else:
+                path = deffile.target_basename
+
+            # We don't have any better way to indicate that the def file
+            # is a dependency to whatever we're building beyond stuffing
+            # it into EXTRA_DEPS.
+            passthru.variables['EXTRA_DEPS'] = [path]
+
             if context.config.substs.get('GNU_CC'):
-                computed_link_flags.resolve_flags('DEFFILE', [deffile])
+                computed_link_flags.resolve_flags('DEFFILE', [path])
             else:
                 computed_link_flags.resolve_flags('DEFFILE',
-                                                  ['-DEF:' + deffile])
+                                                  ['-DEF:' + path])
 
         dist_install = context['DIST_INSTALL']
         if dist_install is True:

python/mozbuild/mozbuild/test/backend/test_recursivemake.py

@@ -325,8 +325,10 @@ class TestRecursiveMakeBackend(BackendTester):
             'RCINCLUDE': [
                 'RCINCLUDE := bar.rc',
             ],
-            'DEFFILE': [
-                'DEFFILE := baz.def',
+            'EXTRA_DEPS': [
+                'EXTRA_DEPS += %s' % mozpath.join(mozpath.relpath(env.topsrcdir,
+                                                                  env.topobjdir),
+                                                  'baz.def'),
             ],
             'WIN32_EXE_LDFLAGS': [
                 'WIN32_EXE_LDFLAGS += -subsystem:console',

python/mozbuild/mozbuild/test/frontend/test_emitter.py

@@ -190,7 +190,9 @@ class TestEmitterBasic(unittest.TestCase):
             'RCFILE': 'foo.rc',
             'RESFILE': 'bar.res',
             'RCINCLUDE': 'bar.rc',
-            'DEFFILE': 'baz.def',
+            'EXTRA_DEPS': [mozpath.join(mozpath.relpath(reader.config.topsrcdir,
+                                                        reader.config.topobjdir),
+                                        'baz.def')],
             'WIN32_EXE_LDFLAGS': ['-subsystem:console'],
         }