0001-Use-hidden-visibility-for-TCMallocGetenvSafe.patch

From 4cd069d0ef876dc1053d09c9785a6cd451061f19 Mon Sep 17 00:00:00 2001
From: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Date: Mon, 22 May 2017 03:18:11 -0700
Subject: [PATCH] Use hidden visibility for TCMallocGetenvSafe

Because otherwise it might be unsafe to call it from ifunc
handler (when non-lazy symbol binding is in effect).
---
 src/base/sysinfo.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/base/sysinfo.cc b/src/base/sysinfo.cc
index 36f7067..b03b719 100644
--- a/src/base/sysinfo.cc
+++ b/src/base/sysinfo.cc
@@ -152,7 +152,7 @@ static size_t slow_strlen(const char *s) {
 // system calls to read the file, and thus avoid setting errno.
 // /proc/self/environ has a limit of how much data it exports (around
 // 8K), so it's not an ideal solution.
-const char* GetenvBeforeMain(const char* name) {
+ATTRIBUTE_HIDDEN const char* GetenvBeforeMain(const char* name) {
   const int namelen = slow_strlen(name);
 #if defined(HAVE___ENVIRON)   // if we have it, it's declared in unistd.h
   if (__environ) {            // can exist but be NULL, if statically linked
@@ -201,7 +201,7 @@ const char* GetenvBeforeMain(const char* name) {
 }
 
 extern "C" {
-  const char* TCMallocGetenvSafe(const char* name) {
+  ATTRIBUTE_HIDDEN const char* TCMallocGetenvSafe(const char* name) {
     return GetenvBeforeMain(name);
   }
 }
-- 
2.11.0