Why libstdc++ doesn't recognize std::vector::cbegin whereas libc++ does?

Asked Jun 04 '19 at 15:59

Active Jun 04 '19 at 15:59

Viewed 108 times

Here is a toy C++ file named cbegin.cpp:

#include <iostream>
#include <vector>

int main()
{
    std::vector<std::string> toto;
    auto first = toto.cbegin();

    return 0;
}

I want to compile it with this command:

clang -x c++ -arch i386 -std=c++11 -stdlib=libstdc++ -lstdc++ cbegin.cpp -o cbegin

But I get this error:

cbegin.cpp:7:20: error: no member named 'cbegin' in 'std::vector<std::basic_string<char>, std::allocator<std::basic_string<char> > >'
        auto first = toto.cbegin();

If I use libc++, it works well:

clang -x c++ -arch i386 -std=c++11 -stdlib=libc++ -lstdc++ cbegin.cpp -o cbegin

Why libstdc++ doesn't recognize std::vector::cbegin? I can't move to libc++ in my project because I have external dependencies compiled with libstdc++.

asked Jun 04 '19 at 15:59

Pierre

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1

Does your libstdc++ support c++11? – juanchopanza Jun 04 '19 at 16:01
2

this should help: https://stackoverflow.com/questions/19774778/when-is-it-necessary-to-use-use-the-flag-stdlib-libstd – bracco23 Jun 04 '19 at 16:02
@juanchopanza How can I check that? – Pierre Jun 04 '19 at 16:03
1

@Pierre Include the header – Vlad from Moscow Jun 04 '19 at 16:04
[What version of libstdc++ do you have](https://stackoverflow.com/questions/10354636/how-do-you-find-what-version-of-libstdc-library-is-installed-on-your-linux-mac)? – NathanOliver Jun 04 '19 at 16:06
`-arch i386` - *really*? That's some seriously *old* hardware you (seem to) need to support. If you don't *actually* need to support such old hardware, then please let your compiler optimize for newer hardware. It'll make a significant difference in performance. You are currently restraining your compiler *significantly*. – Jesper Juhl Jun 04 '19 at 16:07
@JesperJuhl That's the project I'm working on. – Pierre Jun 04 '19 at 16:09
@VladfromMoscow I did it but it changed nothing. What's the point? – Pierre Jun 04 '19 at 16:10
Did you read the link that bracco23 provided? It explains the difference between libc++ and libstd++. – Eljay Jun 04 '19 at 16:16
@Eljay It said that `libstdc++` doesn't support C++11. Should I understand there is no ways to use `std::vector::cbegin` with it? – Pierre Jun 04 '19 at 16:19
2

@Pierre It looks like so apparently. – πάντα ῥεῖ Jun 04 '19 at 16:24

Why libstdc++ doesn't recognize std::vector::cbegin whereas libc++ does?

0 Answers0