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 d6b5ded32a46b8c87717c68839804bc2d3e50747..85083e8bc34a0ab32135b2872c50217c5cad52d2 100644 (file)
--- 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 4dec0c8326bce37056bd48760d09322926eb6974..35b341e759fec202240f8687519e04ae2b362dda 100644 (file)
--- 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