On 7 January 2012 06:49, naveen yadav wrote: > 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. Put std::cout.setstate(ios_base::failbit); after cout has been constructed, so around line 102 > 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)
