From: Jonathan Wakely <jwakely@redhat.com>
Date: Tue, 31 Jan 2023 22:28:16 +0000 (+0000)
Subject: libstdc++: Fix std::random_device for avr
X-Git-Tag: basepoints/gcc-14~1568
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=277dd6ea416718ba5493023b5a4660ecdbaf936c;p=thirdparty%2Fgcc.git

libstdc++: Fix std::random_device for avr

This fixes a build failure that affects avr, but could affect other
targets in theory. The _M_fini function should not try to use ::open or
::fopen if _GLIBCXX_USE_DEV_RANDOM is not defined, because no file can
ever have been opened.

libstdc++-v3/ChangeLog:

	* src/c++11/random.cc (random_device::_M_fini): Do not try to
	close the file handle if the target doesn't support the
	/dev/random and /dev/urandom files.
---

diff --git a/libstdc++-v3/src/c++11/random.cc b/libstdc++-v3/src/c++11/random.cc
index 9872e28b29d4..ed2db4aef57b 100644
--- a/libstdc++-v3/src/c++11/random.cc
+++ b/libstdc++-v3/src/c++11/random.cc
@@ -548,6 +548,7 @@ namespace std _GLIBCXX_VISIBILITY(default)
       }
 #endif
 
+#ifdef _GLIBCXX_USE_DEV_RANDOM
 #ifdef USE_POSIX_FILE_IO
     ::close(_M_fd);
     _M_fd = -1;
@@ -555,6 +556,7 @@ namespace std _GLIBCXX_VISIBILITY(default)
     std::fclose(static_cast<FILE*>(_M_file));
 #endif
     _M_file = nullptr;
+#endif
   }
 
   random_device::result_type