Bug #13920: build failure due to distribution implicit compiler files: _FORTIFY_SOURCE on Gentoo - Ceph - Ceph

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Bug #13920

closed

build failure due to distribution implicit compiler files: _FORTIFY_SOURCE on Gentoo

Added by Robin Johnson over 8 years ago. Updated over 8 years ago.

Status:

Resolved

Priority:

Normal

Assignee:

Samuel Just

Category:

Target version:

% Done:

Source:

other

Tags:

Backport:

Regression:

Severity:

3 - minor

Reviewed:

Affected Versions:

ceph-qa-suite:

Pull request ID:

Crash signature (v1):

Crash signature (v2):

Description

Gentoo's compiler patches include -D_FORTIFY_SOURCE=2 if -O2 or higher are used.

https://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo/src/patchsets/gcc/4.9.3/gentoo/10_all_default-fortify-source.patch?view=markup

This causes lots of error spew that _FORTIFY_SOURCE is defined twice when compiling on Gentoo:
CXX cls/version/cls_version_client.o
<command-line>:0:0: warning: "_FORTIFY_SOURCE" redefined
<built-in>: note: this is the location of the previous definition

To resolve this, we should explicitly undefine _FORTIFY_SOURCE before trying to define it again.