id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
12838	Invalid assignment in iostreams large_file_test.cpp	stephen.clamage@…	Jonathan Turkanis	"/libs/iostreams/test/large_file_test.cpp, line 337
char buf[1] = { z + 1 }; // z is type int

The implicit narrowing conversion from int to char is an error in C++11. With Clang and Oracle Studio it is an unconditional error. With EDG-based compilers, it is an error if you specify strict compliance.

The fix is trivial: 
char buf[1] = { char(z + 1) };"	Bugs	new	To Be Determined	iostreams	Boost 1.63.0	Problem