Merge pull request #1548 from ssssam/sam/stable-ordering

Stable ordering of some commandlines generated by 'gnome' module

5 files changed, 39 insertions, 10 deletions

diff --git a/mesonbuild/backend/backends.py b/mesonbuild/backend/backends.py
index e49793e..a77047b 100644
--- a/mesonbuild/backend/backends.py
+++ b/mesonbuild/backend/backends.py
@@ -23,6 +23,7 @@ import subprocess
 from ..mesonlib import MesonException, get_meson_script
 from ..mesonlib import get_compiler_for_source, classify_unity_sources
 from ..compilers import CompilerArgs
+from collections import OrderedDict
 
 class CleanTrees:
     '''
@@ -574,7 +575,7 @@ class Backend:
         return newargs
 
     def get_build_by_default_targets(self):
-        result = {}
+        result = OrderedDict()
         # Get all build and custom targets that must be built by default
         for name, t in self.build.get_targets().items():
             if t.build_by_default or t.install or t.build_always:
diff --git a/mesonbuild/backend/ninjabackend.py b/mesonbuild/backend/ninjabackend.py
index dfb5600..98a2110 100644
--- a/mesonbuild/backend/ninjabackend.py
+++ b/mesonbuild/backend/ninjabackend.py
@@ -2351,7 +2351,10 @@ rule FORTRAN_DEP_HACK
         cmds = []
         for (k, v) in self.environment.coredata.user_options.items():
             cmds.append('-D' + k + '=' + (v.value if isinstance(v.value, str) else str(v.value).lower()))
-        return cmds
+        # The order of these arguments must be the same between runs of Meson
+        # to ensure reproducible output. The order we pass them shouldn't
+        # affect behaviour in any other way.
+        return sorted(cmds)
 
     # For things like scan-build and other helper tools we might have.
     def generate_utils(self, outfile):
diff --git a/mesonbuild/build.py b/mesonbuild/build.py
index 062b70a..6c16cf9 100644
--- a/mesonbuild/build.py
+++ b/mesonbuild/build.py
@@ -83,9 +83,9 @@ class Build:
         self.project_version = None
         self.environment = environment
         self.projects = {}
-        self.targets = {}
-        self.compilers = {}
-        self.cross_compilers = {}
+        self.targets = OrderedDict()
+        self.compilers = OrderedDict()
+        self.cross_compilers = OrderedDict()
         self.global_args = {}
         self.projects_args = {}
         self.global_link_args = {}
@@ -345,6 +345,9 @@ class BuildTarget(Target):
         self.validate_sources()
         self.validate_cross_install(environment)
 
+    def __lt__(self, other):
+        return self.get_id() < other.get_id()
+
     def __repr__(self):
         repr_str = "<{0} {1}: {2}>"
         return repr_str.format(self.__class__.__name__, self.get_id(), self.filename)
@@ -1304,6 +1307,9 @@ class CustomTarget(Target):
             mlog.warning('Unknown keyword arguments in target %s: %s' %
                          (self.name, ', '.join(unknowns)))
 
+    def __lt__(self, other):
+        return self.get_id() < other.get_id()
+
     def __repr__(self):
         repr_str = "<{0} {1}: {2}>"
         return repr_str.format(self.__class__.__name__, self.get_id(), self.command)
@@ -1470,6 +1476,9 @@ class RunTarget(Target):
         self.args = args
         self.dependencies = dependencies
 
+    def __lt__(self, other):
+        return self.get_id() < other.get_id()
+
     def __repr__(self):
         repr_str = "<{0} {1}: {2}>"
         return repr_str.format(self.__class__.__name__, self.get_id(), self.command)
diff --git a/mesonbuild/mesonlib.py b/mesonbuild/mesonlib.py
index 0a8478b..ae2f88c 100644
--- a/mesonbuild/mesonlib.py
+++ b/mesonbuild/mesonlib.py
@@ -16,6 +16,7 @@
 
 import stat
 import platform, subprocess, operator, os, shutil, re
+import collections
 
 from glob import glob
 
@@ -685,3 +686,18 @@ def get_filenames_templates_dict(inputs, outputs):
         if values['@OUTDIR@'] == '':
             values['@OUTDIR@'] = '.'
     return values
+
+class OrderedSet(collections.OrderedDict):
+    '''
+    A 'set' equivalent that preserves the order in which items are added.
+
+    This is a hack implementation that wraps OrderedDict. It may not be the
+    most efficient solution and might need fixing to override more methods.
+    '''
+    def __init__(self, iterable=None):
+        if iterable:
+            self.update(iterable)
+
+    def update(self, iterable):
+        for item in iterable:
+            self[item] = True
diff --git a/mesonbuild/modules/gnome.py b/mesonbuild/modules/gnome.py
index adb6fa8..6921472 100644
--- a/mesonbuild/modules/gnome.py
+++ b/mesonbuild/modules/gnome.py
@@ -21,7 +21,7 @@ import sys
 import copy
 import subprocess
 from . import ModuleReturnValue
-from ..mesonlib import MesonException, Popen_safe
+from ..mesonlib import MesonException, OrderedSet, Popen_safe
 from ..dependencies import Dependency, PkgConfigDependency, InternalDependency
 from .. import mlog
 from .. import mesonlib
@@ -154,7 +154,7 @@ class GnomeModule(ExtensionModule):
         # Ensure build directories of generated deps are included
         source_dirs += subdirs
 
-        for source_dir in set(source_dirs):
+        for source_dir in OrderedSet(source_dirs):
             cmd += ['--sourcedir', source_dir]
 
         if 'c_name' in kwargs:
@@ -299,9 +299,9 @@ class GnomeModule(ExtensionModule):
 
     def _get_dependencies_flags(self, deps, state, depends=None, include_rpath=False,
                                 use_gir_args=False):
-        cflags = set()
-        ldflags = set()
-        gi_includes = set()
+        cflags = OrderedSet()
+        ldflags = OrderedSet()
+        gi_includes = OrderedSet()
         if not isinstance(deps, list):
             deps = [deps]