Hello Ian,
Thanks for information!
I want to know where can I find include header files in iostream? Or
is there some way to search it fast? I searched in
/usr/include/c++/4.1.2, but can't find it. Can you help?
Thanks,
yixuan
On Wed, Mar 9, 2011 at 3:08 PM, Ian Lance Taylor <iant@xxxxxxxxxx> wrote:
> Yixuan Huang <yixuan178@xxxxxxxxx> writes:
>
>> I have encountered one issue when write a simple test code.
>> #inlcude <iostream>
>> int main{
>> Â const char* str = "aaaa";
>> Â std::cout<<"str len: "<<strlen(str)<<std::endl;
>> Âreturn 0;
>> }
>>
>> If I compile on gcc version 4.1.2 20070115 (SUSE Linux), it can be
>> compiled successfully. Otherwise, on gcc version 4.3.2 [gcc-4_3-branch
>> revision 141291] (SUSE Linux), it will show
>> linux-lht2:/home/yixuan # g++ aa.cpp
>> aa.cpp: In function âint main()â:
>> aa.cpp:6: error: âstrlenâ was not declared in this scope
>>
>> I don't know where can I get the information to explain the different behavior?
>
> This message is not appropriate for the mailing list gcc@xxxxxxxxxxxx
> It would be appropriate for gcc-help@xxxxxxxxxxxx ÂPlease take any
> followups to gcc-help. ÂThanks.
>
> gcc 4.3 is more careful about having one C++ header file include
> another. ÂThe function strlen is defined in <string.h>. ÂIn gcc 4.1
> <iostream> #include'd <string.h>. ÂIn gcc 4.3 it does not.
>
> This is briefly mentioned at http://gcc.gnu.org/gcc-4.3/changes.html:
> Â "Header dependencies have been streamlined, reducing unnecessary
> Â Âincludes and pre-processed bloat."
>
> Ian
>
