Linux dlopen 中对 __dlopen 的未知引用
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Unknown reference to __dlopen in dlopen
提问by Guillaume07
dlopenis located in libdl.abut when I link my application against libdl.a, gcc linker throw this error : unknow reference to __dlopen called in dlopen
dlopen位于libdl.a但是当我将我的应用程序链接到时libdl.a，gcc 链接器会抛出此错误：unknow reference to __dlopen called in dlopen
Should I import another .a?
我应该导入另一个.a吗？
采纳答案by Kevin
When I try to compile statically a dlopenmockup program, gcc(Archlinux/gcc version 4.6.1 20110819 (prerelease)) tells me:
当我尝试静态编译一个dlopen模型程序时，gcc(Archlinux/gcc version 4.6.1 20110819 (prerelease)) 告诉我：
$ gcc test.c -ldl -static
/tmp/ccsWe4RN.o: In function `main': test.c:(.text+0x13):
warning: Using 'dlopen' in statically linked applications requires
at runtime the shared libraries from the glibc version used for linking
and indeed, when I ran this script in /usr/lib/
事实上，当我运行这个脚本时 /usr/lib/
for i in *.a;
do
echo $i;
readelf -a $i | grep __dlopen;
done
I saw:
我看见：
libc.a
16: 0000000000000080 69 FUNC GLOBAL DEFAULT 1 __dlopen
000000000000 002300000001 R_X86_64_64 0000000000000000 __dlopen + 0
35: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND __dlopen
so as per the first line, libc.adoes define your missing symbole.
所以根据第一行，libc.a确实定义了您缺少的符号。
In my system, gcc test.c -ldl -staticis enough to make the application run, but
在我的系统中，gcc test.c -ldl -static足以使应用程序运行，但是
gcc <file> -static -ldl -lc
should fix the problem in your system.
应该解决您系统中的问题。
回答by Kevin
You should be able to use the shared library libdl.sowith
您应该能够使用共享库libdl.so与
gcc -ldl ...
if you don't have a strong requirement on using the static version.
如果您对使用静态版本没有强烈要求。
