Centos7.7.1904上安装qt5.15.2问题汇总
先说结果：没有在Centos7.7上安装成功，原因和问题会在下面一一说明。
1、安装步骤请查考文档或下面的博客
https://blog.csdn.net/ZHONGCAI0901/article/details/118552770
2、我遇到的问题
2.1、在执行.run文件下一步、下一步时候，“Installing Qt”这一步出现了
libstdc++.so.6 ‘GLIBCXX_3.4.21’ not found这个问题；
我的解决方式：升级gcc，升级步骤参考下面博客。
https://www.cnblogs.com/w84422/p/15210919.html
该博客适用于多个版本的gcc升级，我自己尝试升级成功过：5.4.0和9.1.0两个版本
2.2、解决完第一个问题后，可以正常的finished，但是不要高兴太早，真正的坑在这个问题；
qtcreator打不开？？？？？
找原因：
[root@localhost ~]# cd /opt/Qt/Tools/QtCreator/bin/ [root@localhost bin]# ldd qtcreator | grep "not found" ./qtcreator: /lib64/libz.so.1: version `ZLIB_1.2.9' not found (required by /opt/Qt/Tools/QtCreator/bin/./../lib/Qt/lib/libQt6Gui.so.6) ./qtcreator: /lib64/libm.so.6: version `GLIBC_2.27' not found (required by /opt/Qt/Tools/QtCreator/bin/./../lib/Qt/lib/libQt6Gui.so.6) libQt6Core.so.6 => not found libQt6Core.so.6 => not found libQt6Core.so.6 => not found libQt6Core.so.6 => not found libQt6Core.so.6 => not found libQt6Core.so.6 => not found libQt6Core.so.6 => not found libQt6Core.so.6 => not found libQt6Core.so.6 => not found libQt6Core.so.6 => not found libQt6Core.so.6 => not found libQt6Core.so.6 => not found libQt6Core.so.6 => not found
libQt6Core.so.6 not found???
找原因：
[root@localhost lib]# pwd /opt/Qt/Tools/QtCreator/lib/Qt/lib [root@localhost lib]# ldd libQt6Core.so.6 | grep "not found" ./libQt6Core.so.6: /lib64/libc.so.6: version `GLIBC_2.25' not found (required by ./libQt6Core.so.6) ./libQt6Core.so.6: /lib64/libc.so.6: version `GLIBC_2.28' not found (required by ./libQt6Core.so.6)
有人会问Qt6Core.so.6没有找到是不是链接的问题，我使用LD_PRELOAD和LD_LIBRARY_PATH都试过了没有用的，主要原因是GLIBC版本不对吧。
GLIBC_2.25/28 not found ???
[root@localhost lib]# strings /lib64/libc.so.6 | grep GLIBC GLIBC_2.2.5 GLIBC_2.2.6 GLIBC_2.3 GLIBC_2.3.2 GLIBC_2.3.3 GLIBC_2.3.4 GLIBC_2.4 GLIBC_2.5 GLIBC_2.6 GLIBC_2.7 GLIBC_2.8 GLIBC_2.9 GLIBC_2.10 GLIBC_2.11 GLIBC_2.12 GLIBC_2.13 GLIBC_2.14 GLIBC_2.15 GLIBC_2.16 GLIBC_2.17
确实没有25/28，那就升级吧，坑啊，这个不能升级，参考下面两个博客的惨痛教训，我升级了，我又回退了，不然会coredump。最好保持和内核编译的GLIBC版本一致吧。
https://blog.csdn.net/myhes/article/details/106923039
https://blog.51cto.com/berniem2m/2369131
那怎么办呢？我选择了Ubuntu。
