使用g ++进行链接无法搜索-lstdc ++ [英] Linking using g++ fails searching for -lstdc++

问题描述

我试图使用别人的Makefile来编译一个非常简单的c ++库。 makefile文件如下：

  JNIFLAGS = -O2 -pthread -I / usr / lib / jvm / java-6-sun / include -I / usr / lib / jvm / java-6-sun / include / linux 
 
全部：
 rm -f ../dist/libUtils.so 
 g ++ $（JNIFLAGS）-c -m32 -o com_markets_utils_dates_NativeTime.o com_markets_utils_dates_NativeTime.cpp 
 g ++ $（JNIFLAGS）-c -m32 -o DateUtil.o DateUtil.cpp 
 g ++ -pthread -m32 -shared -fPIC -o ../dist/libUtils.so DateUtil.cpp 
 g ++ -pthread -m32 -shared -fPIC -o ../dist/libNativeTime.so DateUtil.o com_markets_utils_dates_NativeTime.o 
  

这个编译好，但链接器抱怨：

  ... 
 / usr / bin / ld：跳过不兼容/usr/lib/gcc/x86_64-linux-gnu/4.4.1/libstdc++.so当搜索-lstdc ++ 
 / usr / bin / ld：在搜索-lstdc ++ 
 / usr / bin / ld时跳过不兼容的/usr/lib/gcc/x86_64-linux-gnu/4.4.1/libstdc++.a：跳过不兼容的/ usr / lib /gcc/x86_64-linux-gnu/4.4.1/libstdc++.so当搜索-lstdc ++ 
 / usr / bin / ld时：跳过不兼容/usr/lib/gcc/x86_64-linux-gnu/4.4.1/libstdc++.a搜索-lstdc ++时
 / usr / bin / ld：找不到-lstdc ++ 
 collect2：ld返回1退出状态$ b $ make：*** [all]错误1 
  

仅供参考，我在Ubuntu 9.10 64位上。

解决方案

，我找到的解决方案是安装g ++ - multilib 。在g ++版本4.6.1上，我遇到了与-lstdc ++相关的不兼容问题。在进一步的探索中：g ++ - multilib是一个虚拟软件包，它安装了g ++ 4.6-multilib然后在/usr/lib/gcc/x86_64-linux-gnu/4.6/32文件夹下安装相应的 libstdc ++。so 。

I'm trying to use someone else's Makefile to complile a very simple c++ library. The makefile is as follows:

JNIFLAGS=-O2 -pthread -I/usr/lib/jvm/java-6-sun/include -I/usr/lib/jvm/java-6-sun/include/linux

all:
    rm -f ../dist/libUtils.so
    g++ $(JNIFLAGS) -c -m32 -o com_markets_utils_dates_NativeTime.o com_markets_utils_dates_NativeTime.cpp
    g++ $(JNIFLAGS) -c -m32 -o DateUtil.o DateUtil.cpp
    g++ -pthread -m32 -shared -fPIC -o ../dist/libUtils.so DateUtil.cpp
    g++ -pthread -m32 -shared -fPIC -o ../dist/libNativeTime.so DateUtil.o com_markets_utils_dates_NativeTime.o

This compiles fine, but the linker complains:

...
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.4.1/libstdc++.so when searching for -lstdc++
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.4.1/libstdc++.a when searching for -lstdc++
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.4.1/libstdc++.so when searching for -lstdc++
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.4.1/libstdc++.a when searching for -lstdc++
/usr/bin/ld: cannot find -lstdc++
collect2: ld returned 1 exit status
make: *** [all] Error 1

FYI, I am on Ubuntu 9.10 64bit.

解决方案

Posting for future reference, a solution I found was to install g++-multilib. I had the same incompatible problem relating to -lstdc++ on g++ version 4.6.1

On further probing: g++-multilib is a dummy package which installed g++4.6-multilib which in turn installed the appropriate libstdc++.so under the /usr/lib/gcc/x86_64-linux-gnu/4.6/32 folder.

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