twister: support namespacing of extra configs

We want to be able to have platform or architecture extra configs
without having to duplicate a whole section of the test specification.

This adds support for namespacing of extra configs, for example:

arch:nios2:CONFIG_SYS_CLOCK_TICKS_PER_SEC=1000

or

platform:qemu_x86:CONFIG_FOO=y

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

Author: nashif

doc/develop/test/twister.rst

@@ -310,6 +310,19 @@ extra_configs: <list of extra configurations>
             extra_configs:
               - CONFIG_ADC_ASYNC=y
 
+    Using namespacing, it is possible to apply a configuration only to some
+    hardware. Currently both architectures and platforms are supported::
+
+        common:
+          tags: drivers adc
+        tests:
+          test:
+            depends_on: adc
+          test_async:
+            extra_configs:
+              - arch:x86:CONFIG_ADC_ASYNC=y
+              - platform:qemu_x86:CONFIG_DEBUG=y
+
 
 build_only: <True|False> (default False)
     If true, don't try to run the test even if the

scripts/pylib/twister/twisterlib/testinstance.py

@@ -212,7 +212,22 @@ def create_overlay(self, platform, enable_asan=False, enable_ubsan=False, enable
         content = ""
 
         if self.testsuite.extra_configs:
-            content = "\n".join(self.testsuite.extra_configs)
+            new_config_list = []
+            # some configs might be conditional on arch or platform, see if we
+            # have a namespace defined and apply only if the namespace matches.
+            # we currently support both arch: and platform:
+            for config in self.testsuite.extra_configs:
+                cond_config = config.split(":")
+                if cond_config[0] == "arch" and len(cond_config) == 3:
+                    if self.platform.arch == cond_config[1]:
+                        new_config_list.append(cond_config[2])
+                elif cond_config[0] == "plaform" and len(cond_config) == 3:
+                    if self.platform.name == cond_config[1]:
+                        new_config_list.append(cond_config[2])
+                else:
+                    new_config_list.append(config)
+
+            content = "\n".join(new_config_list)
 
         if enable_coverage:
             if platform.name in coverage_platform: