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Old 01-30-2017, 01:19 PM   #1
br_ck1
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Default Xcode and std::stof

Hello,

I'm having a very annoying issue in Xcode7.
I use in my c++ code the std::stof() function. It works fine on Windows VisualStudio but on macOS Xcode it states that stof() is not a member function of std::

I use Clang 1.0 as a compiler.

Anyone has a hint please? I would like to continue using stof() in my code...

Thank you in advance,
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Old 01-30-2017, 01:24 PM   #2
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Originally Posted by br_ck1 View Post
I use Clang 1.0 as a compiler.
Wow! How old is that?!

std::stof is a C++11 standard library function which your compiler might not support at all. If it however does support C++11, you will need to enable it separately in your build settings. Newer Visual Studio versions (since VS2010) have C++11 always enabled.
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Old 01-30-2017, 01:34 PM   #3
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Wow! How old is that?!

std::stof is a C++11 standard library function which your compiler might not support at all. If it however does support C++11, you will need to enable it separately in your build settings. Newer Visual Studio versions (since VS2010) have C++11 always enabled.
Thank you for your feedback, I use that compiler because it is recommended for use with WDL-OL as far as I know (Martin Finke's blog) :

COMPILER = com.apple.compilers.llvm.clang.1_0

Or maybe it is ok to use a different one ?

For example : COMPILER = com.apple.compilers.gcc.4_2

Any hint, suggestion, explanation is welcome, I'm relatively newbe to cross-platform wdl development
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Old 01-30-2017, 01:45 PM   #4
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Originally Posted by br_ck1 View Post
Thank you for your feedback, I use that compiler because it is recommended for use with WDL-OL as far as I know (Martin Finke's blog) :

COMPILER = com.apple.compilers.llvm.clang.1_0

Or maybe it is ok to use a different one ?

For example : COMPILER = com.apple.compilers.gcc.4_2

Any hint, suggestion, explanation is welcome, I'm relatively newbe to cross-platform wdl development
Definitely not gcc, that's no longer supported by Apple. Anyway, I suppose XCode should use the latest installed Clang/LLVM compiler anyway. (I don't remember what the Clang versions were back in XCode 7, I am using XCode 8.2 myself currently.) You will however need to separately enable C++11 if you want to use the language features or the library from that.

What macOS versions does your code need to support? The C++11 standard library can't be used for building for older versions than macOS 10.7.
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Old 01-30-2017, 01:56 PM   #5
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I put the target to sdk 10.5 , but I think I can change it to 10.7 if needed to enable c++11 support.

New versions of LLVM compilers come embedded with new versions of Xcode or I need to intall it separately?
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Old 01-30-2017, 02:05 PM   #6
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Originally Posted by br_ck1 View Post
I put the target to sdk 10.5 , but I think I can change it to 10.7 if needed to enable c++11 support.

New versions of LLVM compilers come embedded with new versions of Xcode or I need to intall it separately?
Clang/LLVM is the official compiler for XCode and comes installed with it. Note that besides changing the target sdk and OS version for deployment, you will need to change C++ language dialect and the used standard library versions too.
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Old 01-30-2017, 02:12 PM   #7
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Clang/LLVM is the official compiler for XCode and comes installed with it. Note that besides changing the target sdk and OS version for deployment, you will need to change C++ language dialect and the used standard library versions too.
Ok. If I set both to 10.7 and in the same "common.xcconfig" file I enable :

CLANG_CXX_LANGUAGE_STANDARD = c++0x
CLANG_CXX_LIBRARY = libc++

Will this be sufficient to enable c++11 and consequently std::stof ?
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Old 01-30-2017, 02:56 PM   #8
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Originally Posted by br_ck1 View Post
Ok. If I set both to 10.7 and in the same "common.xcconfig" file I enable :

CLANG_CXX_LANGUAGE_STANDARD = c++0x
CLANG_CXX_LIBRARY = libc++

Will this be sufficient to enable c++11 and consequently std::stof ?
CLANG_CXX_LANGUAGE_STANDARD = c++0x should probably be CLANG_CXX_LANGUAGE_STANDARD = c++11 instead. c++0x used to work but might now be obsolete.
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Old 01-30-2017, 11:41 PM   #9
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Originally Posted by Xenakios View Post
CLANG_CXX_LANGUAGE_STANDARD = c++0x should probably be CLANG_CXX_LANGUAGE_STANDARD = c++11 instead. c++0x used to work but might now be obsolete.
Thank you so much Xenakios for your help !

Just one thing, in addition to :
sdk = 10.7
base sdk = 10.7
CLANG_CXX_LANGUAGE_STANDARD = c++0x / c++11
CLANG_CXX_LIBRARY = libc++
...and MANTAINING : COMPILER = com.apple.compilers.llvm.clang.1_0

Are there other things to change/add ?

Changing this stuff cause some error messages during compiling?

You used the same method/workaround to enable c++11 (if you have it enabled)?

Thank you
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Old 01-31-2017, 12:08 AM   #10
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Quote:
Originally Posted by br_ck1 View Post
Thank you so much Xenakios for your help !

Just one thing, in addition to :
sdk = 10.7
base sdk = 10.7
CLANG_CXX_LANGUAGE_STANDARD = c++0x / c++11
CLANG_CXX_LIBRARY = libc++
...and MANTAINING : COMPILER = com.apple.compilers.llvm.clang.1_0

Are there other things to change/add ?

Changing this stuff cause some error messages during compiling?

You used the same method/workaround to enable c++11 (if you have it enabled)?

Thank you
I've set the stuff in the XCode GUI, so I am not 100% sure how everything should be set up with the text files. What errors are you getting? Did you drop the compiler line? Maybe that makes it use the latest compiler...
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Old 01-31-2017, 01:24 PM   #11
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I've set the stuff in the XCode GUI, so I am not 100% sure how everything should be set up with the text files. What errors are you getting? Did you drop the compiler line? Maybe that makes it use the latest compiler...
>What errors are you getting?
I didn't try that procedure yet, currently I'm away, so I was just asking if that change could cause some incompatibilities when compiling. The only error I had before was the missing std::stof function, because with sdk 10.5 c++11 is not supported...
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Old 01-31-2017, 02:00 PM   #12
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Originally Posted by br_ck1 View Post
>What errors are you getting?
I didn't try that procedure yet, currently I'm away, so I was just asking if that change could cause some incompatibilities when compiling. The only error I had before was the missing std::stof function, because with sdk 10.5 c++11 is not supported...
If things don't start working, as a blunt fix, you could of course just implement std::stof for non-Windows platforms yourself. (Generally it's not recommended to change/add stuff in the std:: namespace but sometimes it's an appropriate quick fix.)

edit : At least with the Visual Studio C++ standard libary, std::stof is just a wrapper with some exception throwing when errors happen for the C library function strtof.
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Old 01-31-2017, 02:18 PM   #13
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Originally Posted by Xenakios View Post
If things don't start working, as a blunt fix, you could of course just implement std::stof for non-Windows platforms yourself. (Generally it's not recommended to change/add stuff in the std:: namespace but sometimes it's an appropriate quick fix.)

edit : At least with the Visual Studio C++ standard libary, std::stof is just a wrapper with some exception throwing when errors happen for the C library function strtof.
Ok, thank you again, I'll try very soon !

...as stof, strtof too seems to be c++11 only...
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Old 01-31-2017, 04:52 PM   #14
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strtof too seems to be c++11 only...
Should not be since it's not even a C++ function but just a C function.
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Old 02-01-2017, 12:18 AM   #15
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Originally Posted by Xenakios View Post
Should not be since it's not even a C++ function but just a C function.
Nevertheless it would seem that strtof() was introduced in C++11:

http://www.cplusplus.com/reference/cstdlib/strtof/
http://en.cppreference.com/w/cpp/string/byte/strtof

But strtod() is older, so OP could probably use that, or else atof().
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