将两个GCC编译的.o目标文件合并到第三个.o文件中 [英] combine two GCC compiled .o object files into a third .o file

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问题描述

如何将两个GCC编译的.o目标文件合并到第三个.o文件中?

How does one combine two GCC compiled .o object files into a third .o file?

$ gcc -c  a.c -o a.o
$ gcc -c  b.c -o b.o
$ ??? a.o b.o -o c.o
$ gcc c.o other.o -o executable

访问源文件 -combine GCC标志将在编译之前合并源文件:

If you have access to the source files the -combine GCC flag will merge the source files before compilation:

$ gcc -c -combine a.c b.c -o c.o

源文件,GCC不接受 .o 文件作为此命令的输入。

However this only works for source files, and GCC does not accept .o files as input for this command.

通常,链接 .o 文件无法正常工作,因为您不能使用链接器的输出作为输入。结果是共享库,并且不会静态链接到生成的可执行文件中。

Normally, linking .o files does not work properly, as you cannot use the output of the linker as input for it. The result is a shared library and is not linked statically into the resulting executable.

$ gcc -shared a.o b.o -o c.o
$ gcc c.o other.o -o executable
$ ./executable
./executable: error while loading shared libraries: c.o: cannot open shared object file: No such file or directory
$ file c.o
c.o: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, not stripped
$ file a.o
a.o: ELF 32-bit LSB relocatable, Intel 80386, version 1 (SYSV), not stripped


推荐答案

-r (或 - 可重新定位)传递到 ld 将创建一个适合作为 ld 输入的对象。

Passing -r (or --relocatable) to ld will create an object that is suitable as input of ld.

$ ld -r a.o b.o -o c.o
$ gcc c.o other.o -o executable
$ ./executable

生成的文件与原始 .o 文件的类型相同。

The generated file is of the same type as the original .o files.

$ file a.o
a.o: ELF 32-bit LSB relocatable, Intel 80386, version 1 (SYSV), not stripped
$ file c.o
c.o: ELF 32-bit LSB relocatable, Intel 80386, version 1 (SYSV), not stripped

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