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

Bug #13920

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

Added by Robin Johnson almost 6 years ago. Updated almost 6 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.

Associated revisions

Revision ccf7c29b (diff)
Added by Robin H. Johnson almost 6 years ago

Gentoo: _FORTIFY_SOURCE fix.

GCC under Gentoo has a patch that has a built-in define for
_FORTIFY_SOURCE if -O2 or higher are used. This causes warnings about
_FORTIFY_SOURCE redefined for every single object compiled.

Work around the issue by explicitly undefining _FORTIFY_SOURCE before we
define it again.

http://tracker.ceph.com/issues/13920 Fixes: #13920
Signed-off-by: Robin H. Johnson <robin.johnson@dreamhost.com>