Floss: Check for C++ output dir instead of Rust output dir

To determine whether to re-run build script for btadapterd, check the
C++ output dir instead of Rust output dir, otherwise we will always
rebuild btadapterd unconditionally.

Bug: 203696027
Tag: #floss
Test: Manual - cargo build and check that btadapterd is only built once
unless there is a change in C++ output dir

Change-Id: I54fe4293a64d0d1abad3828d12590b63650d4ee6

1 files changed, 1 insertions, 0 deletions

diff --git a/build.py b/build.py
index 5d0e0d9cd8..46841ac166 100755
--- a/build.py
+++ b/build.py
@@ -249,6 +249,7 @@ class HostBuild():
         self.env['RUSTFLAGS'] = self._generate_rustflags()
         self.env['CXX_ROOT_PATH'] = os.path.join(self.platform_dir, 'bt')
         self.env['CROS_SYSTEM_API_ROOT'] = os.path.join(self.platform_dir, 'system_api')
+        self.env['CXX_OUTDIR'] = self._gn_default_output()
 
     def run_command(self, target, args, cwd=None, env=None):
         """ Run command and stream the output.