devel/google-perftools: Add a more reliable way to detect that the pr…

…ocess is run under Valgrind

devel/google-perftools/Makefile

@@ -3,7 +3,7 @@
 PORTNAME=	google-perftools
 DISTVERSIONPREFIX=	gperftools-
 DISTVERSION=	2.9.1
-PORTREVISION=	1
+PORTREVISION=	2
 CATEGORIES=	devel
 MASTER_SITES=	https://github.com/gperftools/gperftools/releases/download/gperftools-${PORTVERSION}/
 DISTNAME=	gperftools-${PORTVERSION}

devel/google-perftools/files/patch-src_base_dynamic__annotations.c

@@ -0,0 +1,37 @@
+- add another way to determine if the process is run under valgrind - based on LD_PRELOAD patterns presence
+- Submitted: https://github.com/gperftools/gperftools/pull/1316
+
+--- src/base/dynamic_annotations.c.orig	2021-02-15 06:44:21 UTC
++++ src/base/dynamic_annotations.c
+@@ -43,6 +43,19 @@
+ #include "base/dynamic_annotations.h"
+ #include "getenv_safe.h" // for TCMallocGetenvSafe
+
++static int running_on_valgrind_preload = -1;
++void __attribute__ ((constructor)) premain() {
++  char *LD_PRELOAD = getenv("LD_PRELOAD");
++  running_on_valgrind_preload = LD_PRELOAD != NULL &&
++    (
++      strstr(LD_PRELOAD, "/valgrind/") != NULL
++      ||
++      strstr(LD_PRELOAD, "/vgpreload") != NULL
++    )
++    ?
++    1 : 0;
++}
++
+ static int GetRunningOnValgrind(void) {
+ #ifdef RUNNING_ON_VALGRIND
+   if (RUNNING_ON_VALGRIND) return 1;
+@@ -51,6 +64,11 @@ static int GetRunningOnValgrind(void) {
+   if (running_on_valgrind_str) {
+     return strcmp(running_on_valgrind_str, "0") != 0;
+   }
++
++  // use the LD_PRELOAD trick from https://stackoverflow.com/questions/365458/how-can-i-detect-if-a-program-is-running-from-within-valgrind
++  if (running_on_valgrind_preload == 1)
++    return 1;
++
+   return 0;
+ }
+