On 25/03/21 13:05 +0000, Jonathan Wakely wrote:
>On 24/03/21 22:48 +0100, François Dumont wrote:
>>I still need to find out why, when running test on 
>>__gnu_debug::basic_string after the std::basic_string one, the 
>>generate(sz) call always returns sz.
>
>The "random" generator will always return the same sequence of numbers
>every time you run the test. It uses a default-constructed
>std::mt19937 without a seed, so the sequence of random numbers is 100%
>reproducable.

This patch allows those random engines to be seeded, so that we can test
with different random numbers.

It's already found a bug:

GLIBCXX_SEED_TEST_RNG=-941908610 make check RUNTESTFLAGS=conformance.exp=23_containers/forward_list/requirements/exception/generation_prohibited.cc

Using random seed 3353058686
FAIL: 23_containers/forward_list/requirements/exception/generation_prohibited.cc execution test

We need to investigate that.

Any objections to pushing this?