dhrystone: create nicer custom build, baremetal almost working

build-dhrystone

@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+
+import os
+import shutil
+
+import common
+import shlex
+from shell_helpers import LF
+
+class Main(common.BuildCliFunction):
+    def __init__(self):
+        super().__init__(
+            description='''\
+https://cirosantilli.com/linux-kernel-module-cheat#dhrystone
+'''
+        )
+        self._add_argument('--ccflags')
+        self._add_argument('--force-rebuild')
+        self._add_argument('--optimization-level')
+
+    def setup(self, env):
+        self.root_relpath = os.path.join('submodules', 'dhrystone')
+
+    def build(self):
+        build_dir = self.get_build_dir()
+        cflags = ['-O{}'.format(self.env['optimization_level'])]
+        extra_flags = []
+        if self.env['static']:
+            cflags.extend(['-static'])
+        if self.env['force_rebuild']:
+            extra_flags.extend(['-B', LF])
+        if self.env['mode'] == 'baremetal':
+            extra_objs = [
+                self.env['baremetal_syscalls_obj'],
+                self.env['baremetal_syscalls_asm_obj']
+            ]
+        else:
+            extra_objs = []
+        ret = self.sh.run_cmd(
+            [
+                'make', LF,
+                '-j', str(self.env['nproc']), LF,
+                '-C', os.path.join(self.env['submodules_dir'], 'dhrystone'), LF,
+                'CC={}'.format(self.env['gcc_path']), LF,
+                'CFLAGS={}'.format(' '.join(cflags)), LF,
+                'EXTRA_OBJS={}'.format(' '.join(extra_objs)), LF,
+                'OUT_DIR={}'.format(build_dir), LF,
+            ]
+            + extra_flags
+        )
+        if ret == 0 and self.env['mode'] == 'userland':
+            self.sh.copy_file_if_update(
+                os.path.join(build_dir, 'dhrystone'),
+                os.path.join(self.env['out_rootfs_overlay_lkmc_dir'], self.root_relpath),
+            )
+        return ret
+
+    def get_build_dir(self):
+        return os.path.join(self.env['build_dir'], self.root_relpath)
+
+if __name__ == '__main__':
+    Main().cli()