On Mon, 2018-06-25 at 21:36 -0700, Alice Wonder wrote:

Binary compiled on a system with ggc 5.5.0 w/ libstdc++.so.6.0.21

Because the major version is libstdc++.so.6 there shouldn't be any problems running it on CentOS 7 with libstdc++.so.6.0.19, right?

'Fraid not - there are sub versions within libstdc++.so.6. Do

strings /usr/lib64/libstdc++.so.6 | grep LIBCXX

on a CentOS6 system it gives:

libstdc++.so.6.0.13 GLIBCXX_3.4 GLIBCXX_3.4.1 GLIBCXX_3.4.2 GLIBCXX_3.4.3 . . GLIBCXX_3.4.11 GLIBCXX_3.4.12 GLIBCXX_3.4.13

CentOS7:

libstdc++.so.6.0.19 GLIBCXX_3.4 GLIBCXX_3.4.1 GLIBCXX_3.4.2 GLIBCXX_3.4.3 . . . GLIBCXX_3.4.17 GLIBCXX_3.4.18 GLIBCXX_3.4.19

Fedora 28:

libstdc++.so.6.0.25 GLIBCXX_3.4 GLIBCXX_3.4.1 GLIBCXX_3.4.2 GLIBCXX_3.4.3 . . . GLIBCXX_3.4.23 GLIBCXX_3.4.24 GLIBCXX_3.4.25

So the binary will almost certainly complain about the wrong version even though it is all ostensibly libstdc++.so.6

P.