CMake的禁用-std = C ++ 11 C文件标志 [英] CMake disable -std=c++11 flag for C files

问题描述

我试图建立 bkchaind 。构建一个选择是使用CMake的，所以我用自制（OSX 10.9.1）安装。当我做 cmake的，不过，我得到：

I'm trying to build bkchaind. One build option is to use cmake, so I installed it with Homebrew (OSX 10.9.1). When I do cmake, though, I get:

[  2%] Building C object json-rpc-cpp/src/jsonrpc/CMakeFiles/jsonrpcStatic.dir/connectors/mongoose.c.o
error: invalid argument '-std=c++11' not allowed with 'C/ObjC'

我一点也不知道为什么 cmake的将试图通过一个C ++ - 特定编译器选项为C / ObjC文件。如果我注释掉此行的主要的CMakeLists.txt 文件：

I am none too sure why cmake would try to pass a C++-specific compiler option to a C/ObjC file. If I comment out this line in the main CMakeLists.txt file:

ADD_DEFINITIONS(-std=c++11)

则不再传递标志的任何的文件。然而，C ++的文件确实需要它。我如何获得 cmake的来包括C文件标记为C ++文件，但不？

then it no longer passes the flag to any file. However, the C++ files do need it. How do I get cmake to include the flag for C++ files, but not for C files?

推荐答案

使用 CMAKE_CXX_FLAGS 来设置C ++的特定标志：

Use CMAKE_CXX_FLAGS to set c++ specific flags:

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

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