yuki shimada <epsoft@xxxxxxxxxxxxxx> writes: > Hollo! > I am Yuki Shimada. > This time , I had installed gcc-3.4.0 into my RedHat9. > And then,I had compiled "hello.cc" by using "g++". But cannot excute > "./a.out". Compiler tells me a error. > (Incase of "hellp.c" complied by "gcc", "./a.out" can excute well.) > > #1 error from g++ > [yuki@localhost c++]$ g++ hello.cc > [yuki@localhost c++]$ ./a.out > ./a.out: error while loading shared libraries: libstdc++.so.6: cannot > open shared object file: No such file or directory You need to tell your linker-loader where to find libstdc++.so.6 . Use 'man ld.so' to read about the linker-loader. By default, gcc will install libstdc++.so.6 into /usr/local/lib . If you configured gcc with --prefix, it will be in $prefix/local/lib . If you don't know where libstdc++.so.6 is, $ find / -iname 'libstdc++.so.6' -print will tell you where it is. Once you know where libstdc++.so.6 is, you can use ldconfig or LD_LIBRARY_PATH to tell the linker-loader where it is. Use 'man ldconfig' and 'man ld.so.conf' to read about ldconfig . Usually: # echo /usr/local/lib >> /etc/ld.so.conf # ldconfig (run as root) is correct. If libstdc++.so.6 is not in /usr/local/lib, replace '/usr/local/lib' with the directory containing libstdc++.so.6 . To use LD_LIBRARY_PATH, set it as an environment variable: in bash: $ export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH in csh: > setenv LD_LIBRARY_PATH /usr/local/lib:$LD_LIBRARY_PATH Again, if libstdc++.so.6 is not in /usr/local/lib, replace it with the directory containing libstdc++.so.6 . > #2 my source code: see attachment of this mail. > Is this a bug ? It's not a bug. Thank you for providing more information.