strtof is not defined anymore in std=c++11

[Jon TURNEY]

On 02/04/2013 13:00, Corinna Vinschen wrote:
> On Apr  2 12:37, Laurent Alfonsi wrote:
>> The strtof function is now rejected when selecting the gcc C++11
>> standard option.
>> This regression has been introduced in this patch
>>     http://sourceware.org/ml/newlib/2012/msg00425.html
>>
>> J.Turney patch is fine regarding the C standard side, but when using
>> from C++ :
>>     $ cat a.cpp
>>     #include <cstdlib>
>>
>>     float  f(const char *s, char **endptr) {
>>       return strtof(s, endptr);
>>     }
>>
>> It fails with the message :
>>     $ g++ -std=c++11 a.cpp
>>     a.cpp: In function 'float f(const char*, char**)':
>>     a.cpp:3:30: error: 'strtof' was not declared in this scope
>>
>> Whereas this function strtof is well included in the cstdlib header
>> file defined in C++11 ISO.
>>
>> Please advice.
> 
> Not sure.  Enabling c++11 implies defining __STRICT_ANSI__ with gcc.
> Maybe we have to add something like this to the #if's guarding the
> declarations:
> 
>   || (defined (__cplusplus) && __cplusplus >= 201103L)

Yes.  I think that all of the protoypes I touched: strtof(), strtoll(),
strtoull() and strtold() need this attention.

As currently written, it doesn't test if __STDC_VERSION__ is defined (and so
uses the assumed value of 0 when compiling C++), so do we actually need to
test if __cplusplus is defined?

Would you like me to write a patch?