如何在 CMake 文件中添加链接器或编译标志?
问题描述
我正在使用 arm-linux-androideabi-g++ 编译器.当我尝试编译一个简单的Hello, World!"时程序它编译得很好.当我通过在该代码中添加一个简单的异常处理来测试它时，它也可以工作(在添加 -fexceptions 之后......我猜它默认是禁用的).
I am using the arm-linux-androideabi-g++ compiler. When I try to compile a simple "Hello, World!" program it compiles fine. When I test it by adding a simple exception handling in that code it works too (after adding -fexceptions .. I guess it is disabled by default).
这是针对Android设备的，我只想使用CMake，而不是ndk-build.
This is for an Android device, and I only want to use CMake, not ndk-build.
例如 - first.cpp
#include <iostream>
using namespace std;
int main()
{
try
{
}
catch (...)
{
}
return 0;
}
./arm-linux-androideadi-g++ -o first-test first.cpp -fexceptions
它没有问题...
问题 ...我正在尝试使用 CMake 文件编译该文件.
The problem ... I am trying to compile the file with a CMake file.
我想添加 -fexceptions 作为标志.我试过
I want to add the -fexceptions as a flag. I tried with
set (CMAKE_EXE_LINKER_FLAGS -fexceptions ) or set (CMAKE_EXE_LINKER_FLAGS "fexceptions" )
和
set ( CMAKE_C_FLAGS "fexceptions")
它仍然显示错误.
推荐答案
注意:考虑到 CMake 的演变，自从这个答案被写出来，这里的大部分建议现在已经过时/不推荐使用，并且有更好的替代方案
Note: Given CMake evolution since this was answer was written, most of the suggestions here are now outdated/deprecated and have better alternatives
假设您想添加这些标志(最好在常量中声明它们):
Suppose you want to add those flags (better to declare them in a constant):
SET(GCC_COVERAGE_COMPILE_FLAGS "-fprofile-arcs -ftest-coverage")
SET(GCC_COVERAGE_LINK_FLAGS "-lgcov")
有几种方法可以添加它们:
There are several ways to add them:
最简单的一个(不干净，但简单方便，并且只对编译标志、C 和 C++ 一次有效):
The easiest one (not clean, but easy and convenient, and works only for compile flags, C & C++ at once):
add_definitions(${GCC_COVERAGE_COMPILE_FLAGS})
附加到相应的 CMake 变量:
Appending to corresponding CMake variables:
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${GCC_COVERAGE_COMPILE_FLAGS}")
SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${GCC_COVERAGE_LINK_FLAGS}")
使用目标属性，参见.doc CMake 编译标志目标属性 并且需要知道目标名称.
Using target properties, cf. doc CMake compile flag target property and need to know the target name.
get_target_property(TEMP ${THE_TARGET} COMPILE_FLAGS)
if(TEMP STREQUAL "TEMP-NOTFOUND")
SET(TEMP "") # Set to empty string
else()
SET(TEMP "${TEMP} ") # A space to cleanly separate from existing content
endif()
# Append our values
SET(TEMP "${TEMP}${GCC_COVERAGE_COMPILE_FLAGS}" )
set_target_properties(${THE_TARGET} PROPERTIES COMPILE_FLAGS ${TEMP} )
现在我使用方法 2.
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