[gcc r13-5639] libstdc++: Fix std::random_device for avr
Jonathan Wakely
redi@gcc.gnu.org
Wed Feb 1 21:07:04 GMT 2023
https://gcc.gnu.org/g:277dd6ea416718ba5493023b5a4660ecdbaf936c
commit r13-5639-g277dd6ea416718ba5493023b5a4660ecdbaf936c
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Tue Jan 31 22:28:16 2023 +0000
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:
---
libstdc++-v3/src/c++11/random.cc | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libstdc++-v3/src/c++11/random.cc b/libstdc++-v3/src/c++11/random.cc
index 9872e28b29d..ed2db4aef57 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
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