C语言 如何使用 CMake 链接到 C 数学库？
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How to link to the C math library with CMake?
提问by phillipsK
How do I add the mathlibrary to my CMake file? This postreferences adding a target link library, yet I am not too familiar with C. An Additional post- Could someone please demonstrate an example. DocumentationI am using C and I receive an undefined reference to 'pow'with the pow method of the math header.
如何将math库添加到我的 CMake 文件中？这篇文章引用了添加目标链接库，但我对 C 不太熟悉。 一个附加的帖子- 有人可以演示一个例子。文档我正在使用 C 并且我收到一个undefined reference to 'pow'带有数学标题的 pow 方法的文件。
cmake_minimum_required(VERSION 3.3)
project(CSCI-E-28-Unix-Linux-Systems-Programming)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
set(SOURCE_FILES
CMakeLists.txt
getchar.c
main.cpp
hw0
more01.c)
#target_link_libraries(<math.h> m)
add_executable(main main.cpp)
add_executable(getchar getchar.c)
add_executable(more01 more01.c)
add_executable(argu print_all_arguments.c)
add_executable(chars chars.c)
add_executable(ch4 ch4.c)
回答by usr1234567
Many mathematical functions (pow, sqrt, fabs, logetc.) are declared in math.hand require the library libmto be linked. Unlike libc, which is automatically linked, libmis a separate library and often requires explicit linkage. The linker presumes all libraries to begin with lib, so to link to libmyou link to m.
许多数学函数（pow，sqrt，fabs，log等）中声明math.h，并要求该库libm被链接。与libc自动链接的不同，它是libm一个单独的库，通常需要显式链接。链接器假定所有库都以 开头lib，因此链接到libm您链接到m.
You have to use it like target_link_libraries(ch4 m)to link libmto your target. The first argument must be a target. Thus it must be used after add_executable(ch4 ch4.c)like:
您必须像target_link_libraries(ch4 m)链接libm到目标一样使用它。第一个参数必须是目标。因此它必须在add_executable(ch4 ch4.c)like之后使用：
add_executable(ch4 ch4.c)
target_link_libraries(ch4 m)
