From: Jonathan Wakely <jwakely@redhat.com>
Date: Tue, 9 Nov 2021 10:31:18 +0000 (+0000)
Subject: libstdc++: Make spurious std::random_device FAIL less likely
X-Git-Tag: releases/gcc-10.4.0~298
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c8f35df75ddfd5bab377721582aafb6a5a1463fe;p=thirdparty%2Fgcc.git

libstdc++: Make spurious std::random_device FAIL less likely

It's possible that independent reads from /dev/random and /dev/urandom
could produce the same value by chance. Retry if that happens. The
chances of it happening twice are miniscule.

libstdc++-v3/ChangeLog:

	* testsuite/26_numerics/random/random_device/cons/token.cc:
	Retry if random devices produce the same value.

(cherry picked from commit 8d2d0a6c4391e462555db6d33b2cc00f3da0932f)
---

diff --git a/libstdc++-v3/testsuite/26_numerics/random/random_device/cons/token.cc b/libstdc++-v3/testsuite/26_numerics/random/random_device/cons/token.cc
index 42887703b752..5797571584b4 100644
--- a/libstdc++-v3/testsuite/26_numerics/random/random_device/cons/token.cc
+++ b/libstdc++-v3/testsuite/26_numerics/random/random_device/cons/token.cc
@@ -41,7 +41,7 @@ test02()
 #ifdef _GLIBCXX_USE_DEV_RANDOM
   std::random_device x1("/dev/urandom");
   std::random_device x2("/dev/random");
-  VERIFY( x1() != x2() );
+  VERIFY( x1() != x2() || x1() != x2() );
 #endif
 }