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[v3] use -Wl,-z,relro if possible

From: Benjamin Kosnik <bkoz at redhat dot com>
To: libstdc++ at gcc dot gnu dot org
Cc: gcc-patches at gcc dot gnu dot org
Date: Wed, 11 Jan 2006 18:23:27 -0600
Subject: [v3] use -Wl,-z,relro if possible

For GNU ld that supports -z relro, use it when creating shared object.

This allows things like typeinfo, etc to go into
read-only-after-dynamic-relocation... advantages as outlined:
http://people.redhat.com/drepper/nonselsec.pdf

The compiler is currently producing stuff like this:

_ZTSSt13runtime_error:
	.section	.gnu.linkonce.d.rel.ro._ZTISt13runtime_error,"aw",@progb
_ZTVSt13runtime_error:
	.section	.gnu.linkonce.d.rel.ro._ZTVSt11logic_error,"aw",@progbits

There's no library size difference with this option, and no regressions.

%readelf -l libstdc++.so.6.0.7 | fgrep RELRO
  GNU_RELRO      0x0d81fc 0x000d91fc 0x000d91fc 0x00e04 0x00e04 R   0x1

looks good...

tested x86/linux

-benjamin

Attachment: p.20060111-1
Description: Text document

Follow-Ups:
- Re: [v3] use -Wl,-z,relro if possible
  - From: Paolo Carlini

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