[LU-6394] compile errors when _FORTIFY_SOURCE is used

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.8.0
• Affects Version/s: Lustre 2.7.0, Lustre 2.8.0
• Labels: patch
• Severity: 3
• Assignee: Dmitry Eremin (Inactive)
• Reporter: Frank Zago (Inactive)

Description

When Lustre is configured with CFLAGS="-D_FORTIFY_SOURCE=2 -O2" on Centos 6, the compilation will fails with errors such as this one:

cacheio.c: In function ‘qword_printhex’:
cacheio.c:174: error: ignoring return value of ‘fwrite’, declared with attribute warn_unused_result

The value is usually ignored because it doesn't matter.

Note that these errors tend to show on more modern distributions, that have _FORTIFY_SOURCE on by default.

Issue Links

• is related to: LU-2753 Tracking bug for static code analysis fixes.