https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85494
--- Comment #16 from Jonathan Wakely <redi at gcc dot gnu.org> --- Author: redi Date: Thu Jun 27 11:31:02 2019 New Revision: 272748 URL: https://gcc.gnu.org/viewcvs?rev=272748&root=gcc&view=rev Log: PR libstdc++/85494 use rand_s in std::random_device This is a minimal fix for the use of a deterministic RNG on mingw-w64, simply using rand_s unconditionally. The rest of the r271740 changes on trunk are not included. That means that RDSEED and RDRAND are not available for mingw-w64 and the token passed to the constructor is ignored completely. PR libstdc++/85494 use rand_s in std::random_device * config/os/mingw32-w64/os_defines.h (_GLIBCXX_USE_CRT_RAND_S): Define. * src/c++11/cow-string-inst.cc (random_device::_M_init_pretr1) [_GLIBCXX_USE_CRT_RAND_S]: Do nothing if rand_s will be used. * src/c++11/random.cc [_GLIBCXX_USE_CRT_RAND_S] (__winxp_rand_s): Define new function. (random_device::_M_init_pretr1) [_GLIBCXX_USE_CRT_RAND_S]: Do nothing if rand_s will be used. (random_device::_M_getval_pretr1) [_GLIBCXX_USE_CRT_RAND_S]: Use __winxp_rand_s(). * testsuite/26_numerics/random/random_device/85494.cc: New test. Added: branches/gcc-9-branch/libstdc++-v3/testsuite/26_numerics/random/random_device/85494.cc Modified: branches/gcc-9-branch/libstdc++-v3/ChangeLog branches/gcc-9-branch/libstdc++-v3/config/os/mingw32-w64/os_defines.h branches/gcc-9-branch/libstdc++-v3/src/c++11/cow-string-inst.cc branches/gcc-9-branch/libstdc++-v3/src/c++11/random.cc
