“使用-fPIC重新编译"；即使添加了-fPIC编译标志，错误仍然存​​在 [英] "Recompile with -fPIC" error persists even after adding -fPIC compile flag

问题描述

我已经下载了一些我想从源代码编译的C ++.在构建目录中的命令行中依次运行cmake ../src和make之后，出现以下错误:

I have downloaded some C++ which I want to compile from source. After running cmake ../src and then make from the command line, whilst in the build directory, I get the following error:

/usr/bin/ld: /usr/local/lib/libBulletCollision.a(btDbvtBroadphase.o):
relocation R_X86_64_32S against `_ZTV16btDbvtBroadphase' can not be used when making a shared object;
recompile with -fPIC

我相信这与尝试创建共享库有关，但没有提供必要的内存来做到这一点(尽管我对此并不完全了解...).无论如何，按照我所看到的建议，我尝试了以下方法:

I believe that this is something to do with trying to create a shared library, but not providing the necessary memory to do so (although I don't fully understand this...). Anyway, following the advice I've seen around, I tried the following instead:

make CXXFLAGS='-fPIC'

但是，这给了我与以前完全相同的错误.关于为什么这不能解决问题的任何想法?

However, this gives me exactly the same error as before. Any ideas as to why this did not solve the problem?

推荐答案

我相信Mark说错误与libBulletCollision.a有关时是正确的.您正在构建使用-fPIC构建的.so，但链接到未使用-fPIC的.a.您将需要更改和构建静态库，或者使用-fPIC重建并安装新的从属libBulletCollision.a.

I believe Mark is correct when he says the error is about libBulletCollision.a. You are building a .so built with -fPIC but linking against a .a that did not use -fPIC. You will either need to change and build a static library or rebuild and install a new dependent libBulletCollision.a using -fPIC.

顺便说一句，您应该在cmake配置步骤中以一种更永久的方式将-fPIC标志添加到您的构建中，而不是以这种短暂的方式在运行make时覆盖CXXFLAGS.

By the way, you should add the -fPIC flag to your build in a more permanent way in the cmake configure step rather in this transient way overriding CXXFLAGS when running make.

在调试版本时，将make VERBOSE=1与cmake生成的makefile版本一起使用也很有帮助.

Also using make VERBOSE=1 with cmake generated makefile builds is quite helpful when debugging builds.

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