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
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
将 -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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