* Re: gcc4.1.2 and 4.3.2 has different default behavior
[not found] ` <mcrd3m0py91.fsf@google.com>
@ 2011-03-10 6:37 ` Yixuan Huang
2011-03-10 6:47 ` Ian Lance Taylor
0 siblings, 1 reply; 3+ messages in thread
From: Yixuan Huang @ 2011-03-10 6:37 UTC (permalink / raw)
To: gcc-help
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@google.com> wrote:
> Yixuan Huang <yixuan178@gmail.com> writes:
>
>> I have encountered one issue when write a simple test code.
>> #inlcude <iostream>
>> int main{
>> const char* str = "aaaa";
>> std::cout<<"str len: "<<strlen(str)<<std::endl;
>> return 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 ‘int main()’:
>> aa.cpp:6: error: ‘strlen’ 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@gcc.gnu.org.
> It would be appropriate for gcc-help@gcc.gnu.org. Please take any
> followups to gcc-help. Thanks.
>
> gcc 4.3 is more careful about having one C++ header file include
> another. The function strlen is defined in <string.h>. In gcc 4.1
> <iostream> #include'd <string.h>. In gcc 4.3 it does not.
>
> This is briefly mentioned at http://gcc.gnu.org/gcc-4.3/changes.html:
> "Header dependencies have been streamlined, reducing unnecessary
> includes and pre-processed bloat."
>
> Ian
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: gcc4.1.2 and 4.3.2 has different default behavior
2011-03-10 6:37 ` gcc4.1.2 and 4.3.2 has different default behavior Yixuan Huang
@ 2011-03-10 6:47 ` Ian Lance Taylor
[not found] ` <AANLkTinToeSs1V7xkPWp0irPXkKAg51+rn4MW7y98ys=@mail.gmail.com>
0 siblings, 1 reply; 3+ messages in thread
From: Ian Lance Taylor @ 2011-03-10 6:47 UTC (permalink / raw)
To: Yixuan Huang; +Cc: gcc-help
Yixuan Huang <yixuan178@gmail.com> writes:
> 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?
I don't entirely understand what you are saying. I would expect that
<iostream> for gcc 4.1.2 would be in that directory,
/usr/include/c++/4.1.2. Do you not see it there? What do you see in
that directory?
Ian
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: gcc4.1.2 and 4.3.2 has different default behavior
[not found] ` <mcrsjuvezw3.fsf@google.com>
@ 2011-03-11 2:33 ` Yixuan Huang
0 siblings, 0 replies; 3+ messages in thread
From: Yixuan Huang @ 2011-03-11 2:33 UTC (permalink / raw)
To: gcc-help
Thanks Ian,
Very useful information.
Thanks,
yixuan
On Thu, Mar 10, 2011 at 11:52 PM, Ian Lance Taylor <iant@google.com> wrote:
> Yixuan Huang <yixuan178@gmail.com> writes:
>
>> I can see iostream in that folder. I want to know what my .cpp file
>> include? How can I know for g++ compiler.
>> I tried to use g++ aa.cpp -v, but it can't show the exact header files.
>> I just want to check which exact file include string.h, Just curious on it.
>
> Please reply to the mailing list, not just to me. Thanks.
>
> Run g++ --save-temps aa.cpp. It will create a file aa.ii. That file
> will list the exact header files included, in a format described in the
> cpp manual.
>
> Ian
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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[not found] ` <mcrd3m0py91.fsf@google.com>
2011-03-10 6:37 ` gcc4.1.2 and 4.3.2 has different default behavior Yixuan Huang
2011-03-10 6:47 ` Ian Lance Taylor
[not found] ` <AANLkTinToeSs1V7xkPWp0irPXkKAg51+rn4MW7y98ys=@mail.gmail.com>
[not found] ` <mcrsjuvezw3.fsf@google.com>
2011-03-11 2:33 ` Yixuan Huang
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