问题描述
我想使用来生成针对iOS的Xcode项目。但是，它找不到线程。下面是演示了一个简单的CMake脚本：
I'm trying to use ios-cmake to generate Xcode project targeting iOS. However, it cannot find Threads. Here's a simple CMake script for demonstration:
CMAKE_MINIMUM_REQUIRED (VERSION 2.8)
PROJECT (MyCITest)
SET (CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/modules")
########################
# EDIT: I've also tried adding the lines below prior to posting this question,
# but there doesn't seem to be any effect.
# (http://stackoverflow.com/questions/8386897)
SET (CMAKE_REQUIRED_INCLUDES ${CMAKE_IOS_SDK_ROOT}/usr ${CMAKE_IOS_SDK_ROOT}/usr/include)
SET (CMAKE_CXX_FLAGS "--sysroot=${CMAKE_IOS_SDK_ROOT} ${CMAKE_CXX_FLAGS}")
SET (CMAKE_C_FLAGS "--sysroot=${CMAKE_IOS_SDK_ROOT} ${CMAKE_C_FLAGS}")
########################
FIND_PACKAGE (ZLIB REQUIRED)
FIND_PACKAGE (LibXml2 REQUIRED)
FIND_PACKAGE (Threads REQUIRED)
从终端运行CMake：
Running CMake from the terminal:
cmake .. -DCMAKE_TOOLCHAIN_FILE=../cmake/toolchains/iOS.cmake -GXcode
这是我得到的输出：
-- Toolchain using default iOS SDK: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk
-- Found ZLIB: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/libz.dylib (found version "1.2.5")
-- Found LibXml2: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/libxml2.dylib (found version "2.7.8")
-- Looking for include file pthread.h
-- Looking for include file pthread.h - not found
CMake Error at cmake/modules/FindPackageHandleStandardArgs.cmake:97 (MESSAGE):
Could NOT find Threads (missing: Threads_FOUND)
Call Stack (most recent call first):
cmake/modules/FindPackageHandleStandardArgs.cmake:288 (_FPHSA_FAILURE_MESSAGE)
cmake/modules/FindThreads.cmake:166 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
CMakeLists.txt:8 (FIND_PACKAGE)
-- Configuring incomplete, errors occurred!
我已经三次检查pthread.h位于应用程序/ Xcode.app / Contents / Developer / Platforms / iPhoneOS.platform / Developer / SDKs / iPhoneOS6.0.sdk / usr / include ，此外，它位于ZLib和LibXML2没有问题，因此我不知道我做错了什么。
I've already triple-checked that pthread.h is located in /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/include, and besides, it located ZLib and LibXML2 without a problem, so I'm not sure what I'm doing wrong.
> cmake --version
cmake version 2.8.10.2
推荐答案
事实证明，iOS工具链目前不支持 CheckIncludeFiles.cmake 使用的 TRY_COMPILE 这又由 FindThreads.cmake 使用。工具链目前设置为跳过 TRY_COMPILE ：
It turns out that the iOS toolchain currently doesn't support TRY_COMPILE, which is used by CheckIncludeFiles.cmake, which is in turn used by FindThreads.cmake. The toolchain is currently set to skip TRY_COMPILE by using:
set (CMAKE_CXX_COMPILER_WORKS TRUE)
set (CMAKE_C_COMPILER_WORKS TRUE)
参考：
这篇关于CMake与iOS工具链：无法找到主题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！