链接器错误“针对未定义符号重定位R_X86_64_PC32”尽管与-fPIC汇编 [英] linker error "relocation R_X86_64_PC32 against undefined symbol" despite compilation with -fPIC
问题描述
使用命令行编译c ++程序
g ++ -c prog.cc -std = c ++ 11 -march = native -fPIC -fopenmp
然后尝试通过
g ++ prog.o -shared -fopenmp -o lib / libprog.so
这一直奏效。但是今天我得到了:
$ p $ / usr / bin / ld:prog.o:relocation R_X86_64_PC32针对未定义符号
$ p $ (匿名命名空间)的符号
` _ZTVN12_GLOBAL__N_111handle_baseE'在制作共享
对象时不能使用;使用-fPIC
重新编译/ usr / bin / ld:最终链接失败:错误值
collect2:错误:ld返回1退出状态
_ZTVN12_GLOBAL__N_111handle_baseE
对
vtable进行解压缩:
> :handle_base
( handle_base
是prog.cc中匿名命名空间中定义的多态类,是的,我调用 dynamic_cast< handle_base>()
。)
我使用gcc版本4.7.0(GCC)和GNU ld(GNU Binutils ; openSUSE 11.1)2.19。任何人都可以帮助(建议解决方案[除了没有共享对象或
动态转换
])之外)? 方案
升级到Ubuntu 14.04时,我遇到了类似的情况。我必须在定义'缺少'符号的源文件中添加-fkeep-inline-functions。不知道你的问题是否相似。
I'm compiling a c++ program using the command line
g++ -c prog.cc -std=c++11 -march=native -fPIC -fopenmp
and then try to make a shared object via
g++ prog.o -shared -fopenmp -o lib/libprog.so
This has always worked. But today I get:
/usr/bin/ld: prog.o: relocation R_X86_64_PC32 against undefined symbol
`_ZTVN12_GLOBAL__N_111handle_baseE' can not be used when making a shared
object; recompile with -fPIC
/usr/bin/ld: final link failed: Bad value
collect2: error: ld returned 1 exit status
The symbol _ZTVN12_GLOBAL__N_111handle_baseE
de-mangles to
vtable for (anonymous namespace)::handle_base
(handle_base
is a polymorphic class defined in the anonymous namespace in prog.cc and yes I do call dynamic_cast<handle_base>()
.)
I'm using gcc version 4.7.0 (GCC) and GNU ld (GNU Binutils; openSUSE 11.1) 2.19. Can anybody help (suggest solutions [other than doing without shared object or the dynamic cast
])?
I just ran into something similar when upgrading to ubuntu 14.04. I had to add -fkeep-inline-functions to the source file that defined the 'missing' symbol. No idea if your problem is similar.
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