From: Martin Liska <mliska@suse.cz>
Date: Wed, 5 Feb 2020 08:55:09 +0000 (+0100)
Subject: Document ASLR for Precompiled Headers.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f4239581925d6a9fba049f8f771e909a7a5e5ce7;p=gcc.git

Document ASLR for Precompiled Headers.

	PR c++/92717
	* doc/invoke.texi: Document that one should
	not combine ASLR and -fpch.
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index d6b5ded32a4..85083e8bc34 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2020-02-05  Martin Liska  <mliska@suse.cz>
+
+	PR c++/92717
+	* doc/invoke.texi: Document that one should
+	not combine ASLR and -fpch.
+
 2020-02-04  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/93538
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 4dec0c8326b..35b341e759f 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -31106,6 +31106,10 @@ precompiled header.  The following are known to be safe:
 -fsched-verbose=@var{number}  -fschedule-insns  -fvisibility= @gol
 -pedantic-errors}
 
+@item Address space layout randomization (ASLR) can lead to not binary identical
+PCH files.  If you rely on stable PCH file contents disable ASLR when generating
+PCH files.
+
 @end itemize
 
 For all of these except the last, the compiler automatically