如何从CMake构建目标中只产生一个目标文件（* .o）？ [英] How do I produce only an object file (*.o) from a CMake build target?

问题描述

我试图使用CMake构建一个目标文件，但我似乎不能得到CMake构建除了一个完整的可执行文件之外的东西。我基本上寻找以下编译的结果（结果将被加载到VxWorks目标并链接）：

I'm trying to build an object file using CMake, but I can't seem to get CMake to build something other than a complete executable. I'm basically looking for the result of the following compilation (the result will be loaded on a VxWorks target and linked then):

$(CC) $(CFLAGS) $(INC_DIRS) -c src/object.c

您尝试更改目标的OUTPUT_NAME属性，但这似乎没有帮助。

I've tried changing the OUTPUT_NAME property of the target, but that doesn't seem to help, either.

我想我可以使用自定义命令解决这个问题，但似乎我也在解决CMake提供的好东西。

I think I could work around this by using a custom command, but that seems like I'm also working around the nice things that CMake provides.

感谢您的帮助！

推荐答案

这个答案是在 CMake邮件列表，它的工作方式类似于charm：

This answer was given to me in the CMake mailing list and it worked like a charm:

code> $ {CMAKE_SOURCE_DIR} / cpo 脚本：

Look at the following ${CMAKE_SOURCE_DIR}/cpo script:

#!/bin/sh
d=$1; shift
while [ "$1" != "--" ]; do
    cp $1 $d/$(basename $1); shift
done

现在，看看下面的CMakeLists.txt：

Now, look at the following CMakeLists.txt:

CMAKE_MINIMUM_REQUIRED(VERSION 2.8 FATAL_ERROR)
PROJECT(CPO C) 
FILE(WRITE ${CMAKE_BINARY_DIR}/f.c "void f(void){}\n")
ADD_LIBRARY(f SHARED f.c)
SET_TARGET_PROPERTIES(f PROPERTIES RULE_LAUNCH_LINK
    "${CMAKE_SOURCE_DIR}/cpo ${CMAKE_BINARY_DIR} <OBJECTS> --"
)

启动脚本cpo使目标f在
中作为第一个参数而不是库传入的目录;
一切都应该像往常一样。关键是脚本的
访问< OBJECTS> 占位符，因此它可以对对象
文件进行操作，而实际的链接命令 - 被忽略。那
方式，你可以使用所有的CMake的编译功能和
拦截，直到链接发生。 IMO，这是一个相当干净的
解决方案，应该很容易适应你的需求;
的缺点是 RULE_LAUNCH_LINK 的使用限制为 Makefile 生成器。

The launch script "cpo" makes the target "f" produce object files in the directory passed in as the first parameter instead of a library; everything else should be business as usual. The key is the script's access to the <OBJECTS> placeholder, so it can operate on the object files while the actual link command after the "--" is ignored. That way, you can use all of CMake's capabilities for the compilation and intercept right before linking takes place. IMO, that's a quite clean solution which should be easily adaptable to your needs; the downside is that the use of RULE_LAUNCH_LINK is limited to Makefile generators.

这篇关于如何从CMake构建目标中只产生一个目标文件（* .o）？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IT屋！