Thanks a lot Jonathan, The reason for modifying stdlib is needed because i do not have source code of binary which i want to test. will you pls let me know execty lines in ios_init.cc which I need to modify , this will help me a lot. Thanks On Fri, Jan 6, 2012 at 6:25 PM, Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: > On 6 January 2012 12:41, naveen yadav wrote: >> The reason is that is we want to check effect of cout on application booting. >> Below is simple hello world program, It still call write() system >> call. This may delay if >> we have lots of cout in applications. >> so we want that cout simply return without call of write(). > > std::cout.setstate(ios_base::failbit); > > If you do that at the top of main() it will prevent any writes to > cout. If your library writes to cout before main() starts, you could > put that in a global object's constructor (and use > __attribute__((init_priority(101))) to make it run before other global > constructors) > > Or if you really insist on modifying the stdlib, do that in > ios_init.cc in ios_base::Init::Init() (not in sync_with_stdio, that's > the wrong place)
