I'm going to install one more patch.
Martin
>From e58dd9f5b28468e2afb928c767041e5a3fef057f Mon Sep 17 00:00:00 2001
From: marxin <marxin@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri, 27 Oct 2017 08:34:56 +0000
Subject: [PATCH] Backport r254137
gcc/ChangeLog:
2017-10-27 Martin Liska <mli...@suse.cz>
PR gcov-profile/82457
* doc/invoke.texi: Document that one needs a non-strict ISO mode
for fork-like functions to be properly instrumented.
---
gcc/doc/invoke.texi | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index a0fb09eb9e1..6d0283298c6 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -10648,9 +10648,9 @@ Link your object files with @option{-lgcov} or @option{-fprofile-arcs}
Run the program on a representative workload to generate the arc profile
information. This may be repeated any number of times. You can run
concurrent instances of your program, and provided that the file system
-supports locking, the data files will be correctly updated. Also
-@code{fork} calls are detected and correctly handled (double counting
-will not happen).
+supports locking, the data files will be correctly updated. Unless
+a strict ISO C dialect option is in effect, @code{fork} calls are
+detected and correctly handled without double counting.
@item
For profile-directed optimizations, compile the source files again with
--
2.14.3
