Added "native" kwarg to add_XXX_args. Closes #3669.

docs/markdown/Reference-manual.md

@@ -13,13 +13,20 @@ afterwards](#returned-objects).
   void add_global_arguments(arg1, arg2, ...)
 ```
 
-Adds the positional arguments to the compiler command line for the
-language specified in `language` keyword argument. If a list of
-languages is given, the arguments are added to each of the
-corresponding compiler command lines. Note that there is no way to
-remove an argument set in this way. If you have an argument that is
-only used in a subset of targets, you have to specify it in per-target
-flags.
+Adds the positional arguments to the compiler command line. This
+function has two keyword arguments:
+
+- `language` specifies the language(s) that the arguments should be
+applied to. If a list of languages is given, the arguments are added
+to each of the corresponding compiler command lines. Note that there
+is no way to remove an argument set in this way. If you have an
+argument that is only used in a subset of targets, you have to specify
+it in per-target flags.
+
+- `native` is a boolean specifying whether the arguments should be
+  applied to the native or cross compilation. If omitted, the flags
+  are added to native targets if compiling natively and cross targets
+  if cross compiling. Available since 0.48.0
 
 The arguments are used in all compiler invocations with the exception
 of compile tests, because you might need to run a compile test with
@@ -60,8 +67,9 @@ endif
 Takes one keyword argument, `required`. It defaults to `true`, which
 means that if any of the languages specified is not found, Meson will
 halt. Returns true if all languages specified were found and false
-otherwise. Since *0.47.0*  the value of a [`feature`](Build-options.md#features)
-option can also be passed to the `required` keyword argument.
+otherwise. Since *0.47.0* the value of a
+[`feature`](Build-options.md#features) option can also be passed to
+the `required` keyword argument.
 
 ### add_project_arguments()
 

docs/markdown/snippets/native_args.md

@@ -0,0 +1,34 @@
+## Projects args can be set separately for cross and native builds (potentially breaking change)
+
+It has been a longstanding bug (or let's call it a "delayed bug fix")
+that if yodo this:
+
+```meson
+add_project_arguments('-DFOO', language : 'c')
+```
+
+Then the flag is used both in native and cross compilations. This is
+very confusing and almost never what you want. To fix this a new
+keyword `native` has been added to all functions that add arguments,
+namely `add_global_arguments`, `add_global_link_arguments`,
+`add_project_arguments` and `add_project_link_arguments` that behaves
+like the following:
+
+```
+## Added to native builds when compiling natively and to cross
+## compilations when doing cross compiles.
+add_project_arguments(...)
+
+## Added only to native compilations, not used in cross compilations.
+add_project_arguments(..., native : true)
+
+## Added only to cross compilations, not used in cross compilations.
+add_project_arguments(..., native : false)
+```
+
+Also remember that cross compilation is a property of each
+target. There can be target that are compiled with the native compiler
+and some which are compiled with the cross compiler.
+
+Unfortunately this change is backwards incompatible and may cause some
+projects to fail building. However this should be very rare in practice.

mesonbuild/backend/backends.py

@@ -520,10 +520,10 @@ def generate_basic_compiler_args(self, target, compiler, no_warn_args=False):
         # Add buildtype args: optimization level, debugging, etc.
         commands += compiler.get_buildtype_args(self.get_option_for_target('buildtype', target))
         # Add compile args added using add_project_arguments()
-        commands += self.build.get_project_args(compiler, target.subproject)
+        commands += self.build.get_project_args(compiler, target.subproject, target.is_cross)
         # Add compile args added using add_global_arguments()
         # These override per-project arguments
-        commands += self.build.get_global_args(compiler)
+        commands += self.build.get_global_args(compiler, target.is_cross)
         if not target.is_cross:
             # Compile args added from the env: CFLAGS/CXXFLAGS, etc. We want these
             # to override all the defaults, but not the per-target compile args.

mesonbuild/backend/ninjabackend.py

@@ -1066,8 +1066,8 @@ def generate_cs_target(self, target, outfile):
 
         for dep in target.get_external_deps():
             commands.extend_direct(dep.get_link_args())
-        commands += self.build.get_project_args(compiler, target.subproject)
-        commands += self.build.get_global_args(compiler)
+        commands += self.build.get_project_args(compiler, target.subproject, target.is_cross)
+        commands += self.build.get_global_args(compiler, target.is_cross)
 
         elem = NinjaBuildElement(self.all_outputs, outputs, 'cs_COMPILER', rel_srcs)
         elem.add_dep(deps)
@@ -1080,8 +1080,8 @@ def generate_single_java_compile(self, src, target, compiler, outfile):
         deps = [os.path.join(self.get_target_dir(l), l.get_filename()) for l in target.link_targets]
         args = []
         args += compiler.get_buildtype_args(self.get_option_for_target('buildtype', target))
-        args += self.build.get_global_args(compiler)
-        args += self.build.get_project_args(compiler, target.subproject)
+        args += self.build.get_global_args(compiler, target.is_cross)
+        args += self.build.get_project_args(compiler, target.subproject, target.is_cross)
         args += target.get_java_args()
         args += compiler.get_output_args(self.get_target_private_dir(target))
         args += target.get_classpath_args()
@@ -2601,10 +2601,10 @@ def generate_link(self, target, outfile, outname, obj_list, linker, extra_args=[
 
         if not isinstance(target, build.StaticLibrary):
             # Add link args added using add_project_link_arguments()
-            commands += self.build.get_project_link_args(linker, target.subproject)
+            commands += self.build.get_project_link_args(linker, target.subproject, target.is_cross)
             # Add link args added using add_global_link_arguments()
             # These override per-project link arguments
-            commands += self.build.get_global_link_args(linker)
+            commands += self.build.get_global_link_args(linker, target.is_cross)
             if not target.is_cross:
                 # Link args added from the env: LDFLAGS. We want these to
                 # override all the defaults but not the per-target link args.

mesonbuild/backend/vs2010backend.py

@@ -963,10 +963,10 @@ def gen_vcxproj(self, target, ofname, guid):
                 options = self.environment.coredata.base_options
                 extra_link_args += compiler.get_std_shared_module_link_args(options)
             # Add link args added using add_project_link_arguments()
-            extra_link_args += self.build.get_project_link_args(compiler, target.subproject)
+            extra_link_args += self.build.get_project_link_args(compiler, target.subproject, target.is_cross)
             # Add link args added using add_global_link_arguments()
             # These override per-project link arguments
-            extra_link_args += self.build.get_global_link_args(compiler)
+            extra_link_args += self.build.get_global_link_args(compiler, target.is_cross)
             if not target.is_cross:
                 # Link args added from the env: LDFLAGS. We want these to
                 # override all the defaults but not the per-target link args.

mesonbuild/build.py

@@ -107,6 +107,10 @@ def __init__(self, environment):
         self.projects_args = {}
         self.global_link_args = {}
         self.projects_link_args = {}
+        self.cross_global_args = {}
+        self.cross_projects_args = {}
+        self.cross_global_link_args = {}
+        self.cross_projects_link_args = {}
         self.tests = []
         self.benchmarks = []
         self.headers = []
@@ -167,20 +171,25 @@ def get_data(self):
     def get_install_subdirs(self):
         return self.install_dirs
 
-    def get_global_args(self, compiler):
-        return self.global_args.get(compiler.get_language(), [])
+    def get_global_args(self, compiler, for_cross):
+        d = self.cross_global_args if for_cross else self.global_args
+        return d.get(compiler.get_language(), [])
 
-    def get_project_args(self, compiler, project):
-        args = self.projects_args.get(project)
+    def get_project_args(self, compiler, project, for_cross):
+        d = self.cross_projects_args if for_cross else self.projects_args
+        args = d.get(project)
         if not args:
             return []
         return args.get(compiler.get_language(), [])
 
-    def get_global_link_args(self, compiler):
-        return self.global_link_args.get(compiler.get_language(), [])
+    def get_global_link_args(self, compiler, for_cross):
+        d = self.cross_global_link_args if for_cross else self.global_link_args
+        return d.get(compiler.get_language(), [])
 
-    def get_project_link_args(self, compiler, project):
-        link_args = self.projects_link_args.get(project)
+    def get_project_link_args(self, compiler, project, for_cross):
+        d = self.cross_projects_link_args if for_cross else self.projects_link_args
+
+        link_args = d.get(project)
         if not link_args:
             return []
 

mesonbuild/interpreter.py

@@ -1803,11 +1803,11 @@ def get_cross_property_method(self, args, kwargs):
     {'target_type'}
 )
 
-permitted_kwargs = {'add_global_arguments': {'language'},
-                    'add_global_link_arguments': {'language'},
-                    'add_project_link_arguments': {'language'},
+permitted_kwargs = {'add_global_arguments': {'language', 'native'},
+                    'add_global_link_arguments': {'language', 'native'},
                     'add_languages': {'required'},
-                    'add_project_arguments': {'language'},
+                    'add_project_link_arguments': {'language', 'native'},
+                    'add_project_arguments': {'language', 'native'},
                     'add_test_setup': {'exe_wrapper', 'gdb', 'timeout_multiplier', 'env'},
                     'benchmark': {'args', 'env', 'should_fail', 'timeout', 'workdir', 'suite'},
                     'build_target': known_build_target_kwargs,
@@ -3624,25 +3624,45 @@ def func_add_test_setup(self, node, args, kwargs):
                                                              timeout_multiplier=timeout_multiplier,
                                                              env=env)
 
+    def get_argdict_on_crossness(self, native_dict, cross_dict, kwargs):
+        for_native = kwargs.get('native', not self.environment.is_cross_build())
+        if not isinstance(for_native, bool):
+            raise InterpreterException('Keyword native must be a boolean.')
+        if for_native:
+            return native_dict
+        else:
+            return cross_dict
+
     @permittedKwargs(permitted_kwargs['add_global_arguments'])
     @stringArgs
     def func_add_global_arguments(self, node, args, kwargs):
-        self.add_global_arguments(node, self.build.global_args, args, kwargs)
+        argdict = self.get_argdict_on_crossness(self.build.global_args,
+                                                self.build.cross_global_args,
+                                                kwargs)
+        self.add_global_arguments(node, argdict, args, kwargs)
 
     @permittedKwargs(permitted_kwargs['add_global_link_arguments'])
     @stringArgs
     def func_add_global_link_arguments(self, node, args, kwargs):
-        self.add_global_arguments(node, self.build.global_link_args, args, kwargs)
+        argdict = self.get_argdict_on_crossness(self.build.global_link_args,
+                                                self.build.cross_global_link_args,
+                                                kwargs)
+        self.add_global_arguments(node, argdict, args, kwargs)
 
     @permittedKwargs(permitted_kwargs['add_project_arguments'])
     @stringArgs
     def func_add_project_arguments(self, node, args, kwargs):
-        self.add_project_arguments(node, self.build.projects_args, args, kwargs)
+        argdict = self.get_argdict_on_crossness(self.build.projects_args,
+                                                self.build.cross_projects_args,
+                                                kwargs)
+        self.add_project_arguments(node, argdict, args, kwargs)
 
     @permittedKwargs(permitted_kwargs['add_project_link_arguments'])
     @stringArgs
     def func_add_project_link_arguments(self, node, args, kwargs):
-        self.add_project_arguments(node, self.build.projects_link_args, args, kwargs)
+        argdict = self.get_argdict_on_crossness(self.build.projects_link_args,
+                                                self.build.cross_projects_link_args, kwargs)
+        self.add_project_arguments(node, argdict, args, kwargs)
 
     def add_global_arguments(self, node, argsdict, args, kwargs):
         if self.is_subproject():

run_unittests.py

@@ -485,6 +485,8 @@ def test_snippets(self):
         self.assertTrue(snippet_dir.is_dir())
         for f in snippet_dir.glob('*'):
             self.assertTrue(f.is_file())
+            if f.parts[-1].endswith('~'):
+                continue
             if f.suffix == '.md':
                 with f.open() as snippet:
                     for line in snippet:

test cases/common/23 global arg/meson.build

@@ -3,9 +3,18 @@ project('global arg test', 'cpp', 'c')
 add_global_arguments('-DMYTHING', language : 'c')
 add_global_arguments('-DMYCPPTHING', language : 'cpp')
 
+add_global_arguments('-DGLOBAL_NATIVE', language : 'c', native : true)
+add_global_arguments('-DGLOBAL_CROSS', language : 'c', native : false)
+
+if meson.is_cross_build()
+  c_args = ['-DARG_CROSS']
+else
+  c_args = ['-DARG_NATIVE']
+endif
+
 add_global_arguments('-DMYCANDCPPTHING', language: ['c', 'cpp'])
 
-exe1 = executable('prog', 'prog.c')
+exe1 = executable('prog', 'prog.c', c_args : c_args)
 exe2 = executable('prog2', 'prog.cc')
 
 test('prog1', exe1)

test cases/common/23 global arg/prog.c

@@ -10,6 +10,29 @@
 #error "Global argument not set"
 #endif
 
+#ifdef GLOBAL_NATIVE
+#ifndef ARG_NATIVE
+#error "Global is native but arg_native is not set."
+#endif
+#else
+#ifndef GLOBAL_CROSS
+#error "Neither global_cross nor glogal_native is set."
+#endif
+#ifdef ARG_CROSS
+#error "Global is native but arg_cross is set."
+#endif
+#endif
+
+#ifdef GLOBAL_CROSS
+#ifndef ARG_CROSS
+#error "Global is cross but arg_cross is not set."
+#endif
+#else
+#ifdef ARG_CROSS
+#error "Global is cross but arg_native is set."
+#endif
+#endif
+
 int main(int argc, char **argv) {
     return 0;
 }