build: adapt Arch Linux packaging

CMakeLists.txt

@@ -13,6 +13,15 @@ include(QEmbyPlatformDeps)
 set(QEMBY_RUNTIME_LIB_SUBDIR "qemby" CACHE STRING
     "Subdirectory under the install libdir for bundled private runtime libraries")
 
+option(QEMBY_USE_SYSTEM_DEPS
+    "Prefer system packages for third-party dependencies" ON)
+option(QEMBY_FETCHCONTENT_FALLBACK
+    "Allow FetchContent fallback when a system dependency is missing" ON)
+option(QEMBY_NATIVE_OPTIMIZE
+    "Build qEmby targets with -march=native -mtune=native in optimized configs" OFF)
+option(QEMBY_ENABLE_IPO
+    "Enable interprocedural optimization/LTO for qEmby targets" OFF)
+
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib")
@@ -30,6 +39,46 @@ if(MSVC)
     add_compile_options(/MP)
 endif()
 
+if(NOT QEMBY_USE_SYSTEM_DEPS AND NOT QEMBY_FETCHCONTENT_FALLBACK)
+    message(FATAL_ERROR
+        "At least one dependency source must be enabled: "
+        "QEMBY_USE_SYSTEM_DEPS or QEMBY_FETCHCONTENT_FALLBACK")
+endif()
+
+add_library(qemby_build_options INTERFACE)
+
+if(QEMBY_NATIVE_OPTIMIZE AND CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
+    target_compile_options(qemby_build_options INTERFACE
+        "$<$<CONFIG:Release>:-march=native>"
+        "$<$<CONFIG:Release>:-mtune=native>"
+        "$<$<CONFIG:RelWithDebInfo>:-march=native>"
+        "$<$<CONFIG:RelWithDebInfo>:-mtune=native>"
+    )
+endif()
+
+set(_qemby_ipo_supported FALSE)
+if(QEMBY_ENABLE_IPO)
+    include(CheckIPOSupported)
+    check_ipo_supported(RESULT _qemby_ipo_supported
+        OUTPUT _qemby_ipo_error
+        LANGUAGES CXX)
+    if(NOT _qemby_ipo_supported)
+        message(WARNING
+            "IPO/LTO was requested but is not supported: ${_qemby_ipo_error}")
+    endif()
+endif()
+
+function(qemby_apply_build_options target)
+    if(TARGET qemby_build_options)
+        target_link_libraries("${target}" PRIVATE qemby_build_options)
+    endif()
+
+    if(QEMBY_ENABLE_IPO AND _qemby_ipo_supported)
+        set_target_properties("${target}" PROPERTIES
+            INTERPROCEDURAL_OPTIMIZATION TRUE)
+    endif()
+endfunction()
+
 # ==========================================
 # 允许通过缓存变量或环境变量提供 Qt 安装路径
 # Windows 未显式指定时仍会尝试兼容现有本地默认路径
@@ -68,37 +117,67 @@ endfunction()
 
 set(_qemby_saved_skip_install_rules ${CMAKE_SKIP_INSTALL_RULES})
 set(CMAKE_SKIP_INSTALL_RULES ON)
-FetchContent_Declare(
-    QCoro
-    GIT_REPOSITORY https://github.com/danvratil/qcoro.git
-    GIT_TAG v0.10.0
-)
+if(QEMBY_USE_SYSTEM_DEPS)
+    find_package(QCoro6 CONFIG QUIET COMPONENTS Core Network)
+endif()
 
-# 强制 QCoro 使用 Qt6 进行编译，并关闭不必要的测试与示例构建以加快编译速度
-set(QCORO_QT_MAJOR_VERSION 6 CACHE STRING "Use Qt6 for QCoro" FORCE)
-set(QCORO_BUILD_EXAMPLES OFF CACHE BOOL "Disable QCoro examples" FORCE)
-set(QCORO_WITH_QML OFF CACHE BOOL "Disable QCoro QML module" FORCE)
-set(QCORO_WITH_QTQUICK OFF CACHE BOOL "Disable QCoro QtQuick module" FORCE)
-set(BUILD_TESTING OFF CACHE BOOL "Disable QCoro tests" FORCE)
+if(QCoro6_FOUND)
+    message(STATUS "Using system QCoro6")
+else()
+    if(NOT QEMBY_FETCHCONTENT_FALLBACK)
+        message(FATAL_ERROR
+            "QCoro6 was not found. Install the system package or enable "
+            "QEMBY_FETCHCONTENT_FALLBACK.")
+    endif()
 
-FetchContent_MakeAvailable(QCoro)
-FetchContent_GetProperties(QCoro)
-qemby_ensure_noop_install_script("${qcoro_BINARY_DIR}")
+    message(STATUS "System QCoro6 not found; fetching bundled QCoro")
+    FetchContent_Declare(
+        QCoro
+        GIT_REPOSITORY https://github.com/danvratil/qcoro.git
+        GIT_TAG v0.10.0
+    )
+
+    # 强制 QCoro 使用 Qt6 进行编译，并关闭不必要的测试与示例构建以加快编译速度
+    set(QCORO_QT_MAJOR_VERSION 6 CACHE STRING "Use Qt6 for QCoro" FORCE)
+    set(QCORO_BUILD_EXAMPLES OFF CACHE BOOL "Disable QCoro examples" FORCE)
+    set(QCORO_WITH_QML OFF CACHE BOOL "Disable QCoro QML module" FORCE)
+    set(QCORO_WITH_QTQUICK OFF CACHE BOOL "Disable QCoro QtQuick module" FORCE)
+    set(BUILD_TESTING OFF CACHE BOOL "Disable QCoro tests" FORCE)
+
+    FetchContent_MakeAvailable(QCoro)
+    FetchContent_GetProperties(QCoro)
+    qemby_ensure_noop_install_script("${qcoro_BINARY_DIR}")
+endif()
 
 # ==========================================
 # 引入 spdlog (高性能线程安全日志库, MIT License)
 # ==========================================
-FetchContent_Declare(
-    spdlog
-    GIT_REPOSITORY https://github.com/gabime/spdlog.git
-    GIT_TAG v1.15.3
-)
-set(SPDLOG_BUILD_EXAMPLE OFF CACHE BOOL "Disable spdlog examples" FORCE)
-set(SPDLOG_BUILD_TESTS OFF CACHE BOOL "Disable spdlog tests" FORCE)
-set(SPDLOG_INSTALL OFF CACHE BOOL "Disable spdlog install rules" FORCE)
-FetchContent_MakeAvailable(spdlog)
-FetchContent_GetProperties(spdlog)
-qemby_ensure_noop_install_script("${spdlog_BINARY_DIR}")
+if(QEMBY_USE_SYSTEM_DEPS)
+    find_package(spdlog CONFIG QUIET)
+endif()
+
+if(spdlog_FOUND)
+    message(STATUS "Using system spdlog")
+else()
+    if(NOT QEMBY_FETCHCONTENT_FALLBACK)
+        message(FATAL_ERROR
+            "spdlog was not found. Install the system package or enable "
+            "QEMBY_FETCHCONTENT_FALLBACK.")
+    endif()
+
+    message(STATUS "System spdlog not found; fetching bundled spdlog")
+    FetchContent_Declare(
+        spdlog
+        GIT_REPOSITORY https://github.com/gabime/spdlog.git
+        GIT_TAG v1.15.3
+    )
+    set(SPDLOG_BUILD_EXAMPLE OFF CACHE BOOL "Disable spdlog examples" FORCE)
+    set(SPDLOG_BUILD_TESTS OFF CACHE BOOL "Disable spdlog tests" FORCE)
+    set(SPDLOG_INSTALL OFF CACHE BOOL "Disable spdlog install rules" FORCE)
+    FetchContent_MakeAvailable(spdlog)
+    FetchContent_GetProperties(spdlog)
+    qemby_ensure_noop_install_script("${spdlog_BINARY_DIR}")
+endif()
 set(CMAKE_SKIP_INSTALL_RULES ${_qemby_saved_skip_install_rules})
 unset(_qemby_saved_skip_install_rules)
 # ==========================================