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Description of problem:
As per customer example - rc scripts (.profile, .bashrc) which doesn't conform to POSIX mode causes issues (i.e. while using tigervnc)

According to the bash manual, names should contain letters, digits and underscores only. 

However there are files commonly used inside .bashrc that do not conform to POSIX mode.

The following script use hyphens in function names:
in /etc/bash_completion.d/: icedteaweb-completion

Version-Release number of selected component (if applicable):
icedtea-web-1.6.1-4.el7.x86_64

Steps to Reproduce:
1. $ bash --posix
2. $ . /etc/profile.d/bash_completion.sh
bash: `_itweb-settings': not a valid identifier

Actual results:
bash: `_itweb-settings': not a valid identifier

Expected results:
no errors

If I can read the error correctly, rhis was recently fixed usptream: http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=3365

Easy and safe to backport.

Should be fixed by upcoming rebase: https://bugzilla.redhat.com/show_bug.cgi?id=1475411