id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
6118	Uuid random_generator compiles with warnings by GCC	Vasily Sukhanov <basil@…>	Andy Tompkins	"uuids::random_generator constructor emits warning when compiled with GCC:
>g++ -O2 -Wall -Werror uuidTest.cpp[[BR]]

On Linux x86_64, gcc 4.5.2 output is

/home/vasily/boost_1_47_0/boost/uuid/seed_rng.hpp: In member function ‘void boost::uuids::detail::seed_rng::sha1_random_digest_()’:
/home/vasily/boost_1_47_0/boost/uuid/seed_rng.hpp:152:53: error: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result

Cross gcc 4.5.3 (Linux -> Solaris) and gcc 4.6.1 (Linux -> AIX) produce 

In file included from testBoostUuid.cpp:3:0:
/emc/sukhav/cross/boost_1_47_0/boost/uuid/seed_rng.hpp: In constructor ‘boost::uuids::basic_random_generator<UniformRandomNumberGenerator>::basic_random_generator() [with UniformRandomNumberGenerator = boost::random::mersenne_twister_engine<unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615u, 11ul, 4294967295u, 7ul, 2636928640u, 15ul, 4022730752u, 18ul, 1812433253u>]’:
/emc/sukhav/cross/boost_1_47_0/boost/uuid/seed_rng.hpp:243:34: error: ‘end.boost::uuids::detail::generator_iterator<boost::uuids::detail::seed_rng>::m_value’ may be used uninitialized in this function [-Werror=uninitialized]

Latter warning is regression. Compilation passes with boost 1.46.1. Probably, it's caused by some changes in Random library."	Bugs	closed	To Be Determined	uuid	Boost 1.47.0	Problem	fixed	warning gcc	jonathan.jones@…