我正在尝试使用Cmake将外部库安装到我的C ++项目中。我希望使用该库生成Xcode项目。在我的终端中，我从构建目录运行以下命令：
cmake -G Xcode ..
这给了我以下错误：
-- The CXX compiler identification is unknown
-- The C compiler identification is unknown
CMake Error at CMakeLists.txt:6 (project):
No CMAKE_CXX_COMPILER could be found.
CMake Error at CMakeLists.txt:6 (project):
No CMAKE_C_COMPILER could be found.
我正在使用g ++编译器：
Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 7.0.0 (clang-700.1.76)
Target: x86_64-apple-darwin14.5.0
Thread model: posix
编辑：CMakeLists.txt文件
file(READ "${CMAKE_CURRENT_SOURCE_DIR}/VERSION" PROJECT_VERSION_FULL)
string(REGEX REPLACE "[\n\r]" "" PROJECT_VERSION_FULL "${PROJECT_VERSION_FULL}")
string(REGEX REPLACE "^([0-9]+)\\.[0-9]+\\.[0-9]+$" "\\1" PROJECT_VERSION_MAJOR "${PROJECT_VERSION_FULL}")
string(REGEX REPLACE "^[0-9]+\\.([0-9]+)\\.[0-9]+$" "\\1" PROJECT_VERSION_MINOR "${PROJECT_VERSION_FULL}")
string(REGEX REPLACE "^[0-9]+\\.[0-9]+\\.([0-9]+)$" "\\1" PROJECT_VERSION_PATCH "${PROJECT_VERSION_FULL}")
set(PROJECT_VERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}")
math(EXPR LIBRARY_VERSION_MAJOR "${PROJECT_VERSION_MAJOR}")
set(LIBRARY_VERSION_MINOR "${PROJECT_VERSION_MINOR}")
set(LIBRARY_VERSION_PATCH "${PROJECT_VERSION_PATCH}")
set(LIBRARY_VERSION "${LIBRARY_VERSION_MAJOR}.${LIBRARY_VERSION_MINOR}")
set(LIBRARY_VERSION_FULL "${LIBRARY_VERSION}.${LIBRARY_VERSION_PATCH}")
option(CODE_COVERAGE "Set ON to add code coverage compile options" OFF)
option(GENERATE_DOC "Set ON to genrate doxygen API reference in build/doc directory" OFF)
# C++11 compiler Check
if(NOT CMAKE_CXX_COMPILER_VERSION) # work around for cmake versions smaller than 2.8.10
execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE CMAKE_CXX_COMPILER_VERSION)
endif()
if(CMAKE_CXX_COMPILER MATCHES ".*clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
set(CMAKE_COMPILER_IS_CLANGXX 1)
endif()
if( (CMAKE_COMPILER_IS_GNUCXX AND ${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS 4.7) OR
(CMAKE_COMPILER_IS_CLANGXX AND ${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS 3.2))
message(FATAL_ERROR "Your C++ compiler does not support C++11. Please install g++ 4.7 (or greater) or clang 3.2 (or greater)")
else()
message(STATUS "Compiler is recent enough to support C++11.")
endif()
if( CMAKE_COMPILER_IS_GNUCXX )
append_cxx_compiler_flags("-std=c++11 -Wall -Wextra -DNDEBUG" "GCC" CMAKE_CXX_FLAGS)
append_cxx_compiler_flags("-O3 -ffast-math -funroll-loops" "GCC" CMAKE_CXX_OPT_FLAGS)
if ( CODE_COVERAGE )
append_cxx_compiler_flags("-g -fprofile-arcs -ftest-coverage -lgcov" "GCC" CMAKE_CXX_FLAGS)
endif()
else()
if(MSVC)
append_cxx_compiler_flags("/EHsc" "MSVC" CMAKE_CXX_FLAGS)
append_cxx_compiler_flags("/Od" "MSVC" CMAKE_CXX_FLAGS_DEBUG)
append_cxx_compiler_flags("/Ox" "MSVC" CMAKE_CXX_FLAGS_RELEASE)
set(vars CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
foreach(var ${vars})
string(REPLACE "/MD" "-MT" ${var} "${${var}}")
endforeach(var)
add_definitions("/DMSVC_COMPILER")
else()
append_cxx_compiler_flags("-std=c++11 -DNDEBUG" "CLANG" CMAKE_CXX_FLAGS)
append_cxx_compiler_flags("-stdlib=libc++" "CLANG" CMAKE_CXX_FLAGS)
append_cxx_compiler_flags("-O3 -ffast-math -funroll-loops" "CLANG" CMAKE_CXX_OPT_FLAGS)
endif()
endif()
还有CMakeEdit.log：
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler:
Build flags:
Id flags:
The output was:
1
xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance
Compiling the C compiler identification source file "CMakeCCompilerId.c" failed.
Compiler:
Build flags:
Id flags:
The output was:
1
xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance
修改
当xcode-select开发人员目录指向/ Library / Developer / CommandLineTools时，当需要完整的常规XCode时（在XCode之后安装CLT时）会发生此问题。
我找到了解决方案：
sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
完成此操作后，当我运行cmake -G Xcode ..时，我会收到其他错误：
-- The CXX compiler identification is AppleClang 7.0.0.7000176
-- The C compiler identification is AppleClang 7.0.0.7000176
CMake Error at /usr/local/Cellar/cmake/3.4.0/share/cmake/Modules/Platform/Darwin.cmake:76 (message):
CMAKE_OSX_DEPLOYMENT_TARGET is '10.10' but CMAKE_OSX_SYSROOT:
""
is not set to a MacOSX SDK with a recognized version. Either set
CMAKE_OSX_SYSROOT to a valid SDK or set CMAKE_OSX_DEPLOYMENT_TARGET to
empty.
Call Stack (most recent call first):
/usr/local/Cellar/cmake/3.4.0/share/cmake/Modules/CMakeSystemSpecificInformation.cmake:36 (include)
CMakeLists.txt:6 (project)
编辑2 看起来操作系统指定的SDK是错误的。
CMAKE_OSX_DEPLOYMENT_TARGET is '10.10' but the matching SDK does not exist
at:
"/Applications/DEV/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk"
Instead using SDK:
"/Applications/DEV/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk".
Call Stack (most recent call first):
/usr/local/Cellar/cmake/3.4.0/share/cmake/Modules/CMakeSystemSpecificInitialize.cmake:18 (include)
CMakeLists.txt:6 (project)
-- The CXX compiler identification is AppleClang 7.0.0.7000176
-- The C compiler identification is AppleClang 7.0.0.7000176
CMake Error at /usr/local/Cellar/cmake/3.4.0/share/cmake/Modules/Platform/Darwin.cmake:76 (message):
CMAKE_OSX_DEPLOYMENT_TARGET is '10.10' but CMAKE_OSX_SYSROOT:
""
is not set to a MacOSX SDK with a recognized version. Either set
CMAKE_OSX_SYSROOT to a valid SDK or set CMAKE_OSX_DEPLOYMENT_TARGET to
empty.
Call Stack (most recent call first):
/usr/local/Cellar/cmake/3.4.0/share/cmake/Modules/CMakeSystemSpecificInformation.cmake:36 (include)
CMakeLists.txt:6 (project)
答案 0 :(得分：8)
我遇到了同样的问题，但我解决了这个问题：
public MineSweeperVisual(int height2, int width2, int bombs) {
height = height2;
width = width2;
buttons = new JButton[height * width];
flag = false;
result = new JLabel("Playing");
grid = new String[height][width];
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
grid[x][y] = "AA";
}
}
for (int i = 0; i < bombs; i++) {
int x = (int) (Math.random() * width);
int y = (int) (Math.random() * height);
grid[y][x] = "BH";
}
// grid = resetGrid(grid, height, width);
loadButtons();
createFlagButton();
createPanel();
add(panel);
pack();
//setSize(20 * width, 20 * height);
setLocationRelativeTo(null);
}
在执行上述操作之前，sudo xcode-select --reset
报告路径为xcode-select -p。
重置后，路径为/Library/Developer/CommandLineTools。
答案 1 :(得分：5)
我有相同的输出，可以通过同意苹果许可来解决它。
sudo xcodebuild -license accept
答案 2 :(得分：3)
通常可以通过清除CMake构建缓存并在项目（）之前将以下内容添加到CMakeLists.txt来解决SDK中的错误：
SET(MACOSX_DEPLOYMENT_TARGET ${DARWIN_MAJOR_SDK_VERSION}.${DARWIN_MINOR_SDK_VERSION})
SET(CMAKE_CXX_FLAGS "--sysroot ${CMAKE_OSX_SYSROOT} ${CMAKE_CXX_FLAGS}")
MESSAGE("Setting MACOSX_DEPLOYMENT_TARGET to '${MACOSX_DEPLOYMENT_TARGET}'.")
如果您发现没有解决问题，那么您应该检查Xcode的版本是否是最新的并且已经安装了您指定的SDK。一般来说，Homebrew和Macports CMake都应该安装最新稳定版本的Xcode。
答案 3 :(得分：2)
我遇到了同样的问题，并且在其中一条评论中提到它似乎是因为我首先安装了命令行工具。
我通过打开Xcode应用程序，转到首选项 - ＆gt;解决了这个问题。位置，并从命令行工具的下拉列表中选择Xcode安装。它最初是空白的。
答案 4 :(得分：0)
我通过以下方式解决了类似的问题
gem list libv8 --remote --all
gem install libv8 -v 3.16.14.19 -- --with-system-v8
gem install therubyracer -- --with-v8-dir=/Users/YOUR_NAME/homebrew/opt/v8@3.15
同意许可后，可以识别C编译器和CXX编译器。
===============================
作为参考，我的错误消息是：
sudo xcodebuild -license