From 75462c504589987c7235948ea2aca4fd1ed3c7bd Mon Sep 17 00:00:00 2001
From: Ruixiang Du <ruixiang.du@gmail.com>
Date: Sun, 12 Jul 2026 21:22:24 +0800
Subject: [PATCH] build: assembly follows the family bin/lib placement
 convention

Every executable -> build/bin, every library -> build/lib, regardless
of producing component (previously: driver/nav routed to top-level
lib while telemetry/messaging scattered into their component subdirs
and bin/ was empty). Guarded (if NOT set) so a parent embedding the
superbuild keeps its own layout. Verified: full five-component
assembly, 17 binaries in bin/, 24 archives in lib/, zero strays under
build/components.
---
 CMakeLists.txt | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4bbc3a8..74a029a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,6 +15,23 @@ project(xMotion VERSION 0.1.0 LANGUAGES CXX)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 
+# -- Output layout ------------------------------------------------------------
+# The assembly follows the family bin/lib placement convention: every
+# executable lands in build/bin and every library in build/lib, regardless
+# of which component produced it. Guarded so a parent project embedding
+# this superbuild keeps its own layout. Components that already anchor
+# their outputs to CMAKE_BINARY_DIR (driver, navigation) align with this
+# automatically; the rest inherit it.
+if(NOT CMAKE_RUNTIME_OUTPUT_DIRECTORY)
+  set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+endif()
+if(NOT CMAKE_LIBRARY_OUTPUT_DIRECTORY)
+  set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib")
+endif()
+if(NOT CMAKE_ARCHIVE_OUTPUT_DIRECTORY)
+  set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib")
+endif()
+
 # -- Options ----------------------------------------------------------------
 # xmBase (foundation) is always built. The rest are opt-in so a consumer only
 # pays for the dependency footprint it actually needs.