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Upgrading to C++17 — error: ‘__BEGIN_NAMESPACE_STD’ does not name a type


how to enable __BEGIN_NAMESPACE_STD in stdlib.hWhat does the explicit keyword mean?Do the parentheses after the type name make a difference with new?Compiling C++11 with g++error while working with boost::sregex_token_iteratorDoes std::vector<Object> reserve method need a copy constructor for Object class?Invalid use of incomplete type struct std::hash with unordered_map with std::pair of enum class as keyWhat are the new features in C++17?Compiler requesting c++17 support to be enabled for std::variant by using the -std++17 flag when -std=c++17 is in compiler outputSetup Clang on Travis CI for C++17How to fix overloading operands +?













6















I'm trying to upgrade an application to C++17 and am getting the following compiler error:



error: ‘__BEGIN_NAMESPACE_STD’ does not name a type


I'm using gcc (GCC) 8.2.0 and compiling with the following command: 



g++ -std=c++17 variant.cpp -o variant


Here's a small test program:



#include <iostream>
#include <variant>

using v_t = std::variant<int, double>;

int main(int argc, char const* argv[]) 

 v_t foo = 5;
 printf("foo contains %dn", *std::get_if<int>(&foo));

 std::cout << "Success" << std::endl;
 return 0;



And here's the error I get (below). Note that how to enable __BEGIN_NAMESPACE_STD in stdlib.h discusses a similar issue but the proposed solution (include C++ headers, not C headers such as stdlib.h) is something I'm already doing.



I am able to get this code compiling on my OSX laptop, possibly because I have a newer libc installed by default. However, when I run on my linux machine I get these errors. On the Linux machine, I am using the following linker/glibc version: ldd (Ubuntu EGLIBC 2.19-0ubuntu6.14) 2.19



I'm continuing to debug this but would appreciate any pointers in the right direction.



In file included from /toolchains/gcc-8.2.0/include/c++/8.2.0/cstdlib:75,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/ext/string_conversions.h:41,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/bits/basic_string.h:6391,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/string:52,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/bits/locale_classes.h:40,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/bits/ios_base.h:41,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/ios:42,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/ostream:38,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/iostream:39,
 from variant.cpp:1:
/usr/include/stdlib.h:95:1: error: ‘__BEGIN_NAMESPACE_STD’ does not name a type
 __BEGIN_NAMESPACE_STD
 ^~~~~~~~~~~~~~~~~~~~~
/usr/include/stdlib.h:101:5: error: ‘div_t’ does not name a type; did you mean ‘pid_t’?
 } div_t;
 ^~~~~
 pid_t
/usr/include/stdlib.h:112:1: error: ‘__END_NAMESPACE_STD’ does not name a type
 __END_NAMESPACE_STD
 ^~~~~~~~~~~~~~~~~~~
/usr/include/stdlib.h:121:5: error: ‘lldiv_t’ does not name a type; did you mean ‘ldiv_t’?
 } lldiv_t;
 ^~~~~~~





c++ c++17 libstdc++







share|improve this question



















  • 3





    This is not about libc, but libstdc++. Presumably the alternative toolchain was not installed correctly or correctly activated, and installed headers leak into the compilation. Check the use of your -I or -isystem flags. It could also be helpful to look at g++ -E output to determine which files were included from where.

    – Florian Weimer
    Mar 21 at 13:49











  • Thanks, @FlorianWeimer -- you are correct. This was an issue with a broken gcc build. I recompiled from scratch and everything just worked.

    – Kulluk007
    Mar 21 at 15:31















6















I'm trying to upgrade an application to C++17 and am getting the following compiler error:



error: ‘__BEGIN_NAMESPACE_STD’ does not name a type


I'm using gcc (GCC) 8.2.0 and compiling with the following command: 



g++ -std=c++17 variant.cpp -o variant


Here's a small test program:



#include <iostream>
#include <variant>

using v_t = std::variant<int, double>;

int main(int argc, char const* argv[]) 

 v_t foo = 5;
 printf("foo contains %dn", *std::get_if<int>(&foo));

 std::cout << "Success" << std::endl;
 return 0;



And here's the error I get (below). Note that how to enable __BEGIN_NAMESPACE_STD in stdlib.h discusses a similar issue but the proposed solution (include C++ headers, not C headers such as stdlib.h) is something I'm already doing.



I am able to get this code compiling on my OSX laptop, possibly because I have a newer libc installed by default. However, when I run on my linux machine I get these errors. On the Linux machine, I am using the following linker/glibc version: ldd (Ubuntu EGLIBC 2.19-0ubuntu6.14) 2.19



I'm continuing to debug this but would appreciate any pointers in the right direction.



In file included from /toolchains/gcc-8.2.0/include/c++/8.2.0/cstdlib:75,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/ext/string_conversions.h:41,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/bits/basic_string.h:6391,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/string:52,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/bits/locale_classes.h:40,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/bits/ios_base.h:41,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/ios:42,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/ostream:38,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/iostream:39,
 from variant.cpp:1:
/usr/include/stdlib.h:95:1: error: ‘__BEGIN_NAMESPACE_STD’ does not name a type
 __BEGIN_NAMESPACE_STD
 ^~~~~~~~~~~~~~~~~~~~~
/usr/include/stdlib.h:101:5: error: ‘div_t’ does not name a type; did you mean ‘pid_t’?
 } div_t;
 ^~~~~
 pid_t
/usr/include/stdlib.h:112:1: error: ‘__END_NAMESPACE_STD’ does not name a type
 __END_NAMESPACE_STD
 ^~~~~~~~~~~~~~~~~~~
/usr/include/stdlib.h:121:5: error: ‘lldiv_t’ does not name a type; did you mean ‘ldiv_t’?
 } lldiv_t;
 ^~~~~~~





c++ c++17 libstdc++







share|improve this question



















  • 3





    This is not about libc, but libstdc++. Presumably the alternative toolchain was not installed correctly or correctly activated, and installed headers leak into the compilation. Check the use of your -I or -isystem flags. It could also be helpful to look at g++ -E output to determine which files were included from where.

    – Florian Weimer
    Mar 21 at 13:49











  • Thanks, @FlorianWeimer -- you are correct. This was an issue with a broken gcc build. I recompiled from scratch and everything just worked.

    – Kulluk007
    Mar 21 at 15:31













6












6








6








I'm trying to upgrade an application to C++17 and am getting the following compiler error:



error: ‘__BEGIN_NAMESPACE_STD’ does not name a type


I'm using gcc (GCC) 8.2.0 and compiling with the following command: 



g++ -std=c++17 variant.cpp -o variant


Here's a small test program:



#include <iostream>
#include <variant>

using v_t = std::variant<int, double>;

int main(int argc, char const* argv[]) 

 v_t foo = 5;
 printf("foo contains %dn", *std::get_if<int>(&foo));

 std::cout << "Success" << std::endl;
 return 0;



And here's the error I get (below). Note that how to enable __BEGIN_NAMESPACE_STD in stdlib.h discusses a similar issue but the proposed solution (include C++ headers, not C headers such as stdlib.h) is something I'm already doing.



I am able to get this code compiling on my OSX laptop, possibly because I have a newer libc installed by default. However, when I run on my linux machine I get these errors. On the Linux machine, I am using the following linker/glibc version: ldd (Ubuntu EGLIBC 2.19-0ubuntu6.14) 2.19



I'm continuing to debug this but would appreciate any pointers in the right direction.



In file included from /toolchains/gcc-8.2.0/include/c++/8.2.0/cstdlib:75,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/ext/string_conversions.h:41,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/bits/basic_string.h:6391,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/string:52,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/bits/locale_classes.h:40,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/bits/ios_base.h:41,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/ios:42,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/ostream:38,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/iostream:39,
 from variant.cpp:1:
/usr/include/stdlib.h:95:1: error: ‘__BEGIN_NAMESPACE_STD’ does not name a type
 __BEGIN_NAMESPACE_STD
 ^~~~~~~~~~~~~~~~~~~~~
/usr/include/stdlib.h:101:5: error: ‘div_t’ does not name a type; did you mean ‘pid_t’?
 } div_t;
 ^~~~~
 pid_t
/usr/include/stdlib.h:112:1: error: ‘__END_NAMESPACE_STD’ does not name a type
 __END_NAMESPACE_STD
 ^~~~~~~~~~~~~~~~~~~
/usr/include/stdlib.h:121:5: error: ‘lldiv_t’ does not name a type; did you mean ‘ldiv_t’?
 } lldiv_t;
 ^~~~~~~





c++ c++17 libstdc++







share|improve this question
















I'm trying to upgrade an application to C++17 and am getting the following compiler error:



error: ‘__BEGIN_NAMESPACE_STD’ does not name a type


I'm using gcc (GCC) 8.2.0 and compiling with the following command: 



g++ -std=c++17 variant.cpp -o variant


Here's a small test program:



#include <iostream>
#include <variant>

using v_t = std::variant<int, double>;

int main(int argc, char const* argv[]) 

 v_t foo = 5;
 printf("foo contains %dn", *std::get_if<int>(&foo));

 std::cout << "Success" << std::endl;
 return 0;



And here's the error I get (below). Note that how to enable __BEGIN_NAMESPACE_STD in stdlib.h discusses a similar issue but the proposed solution (include C++ headers, not C headers such as stdlib.h) is something I'm already doing.



I am able to get this code compiling on my OSX laptop, possibly because I have a newer libc installed by default. However, when I run on my linux machine I get these errors. On the Linux machine, I am using the following linker/glibc version: ldd (Ubuntu EGLIBC 2.19-0ubuntu6.14) 2.19



I'm continuing to debug this but would appreciate any pointers in the right direction.



In file included from /toolchains/gcc-8.2.0/include/c++/8.2.0/cstdlib:75,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/ext/string_conversions.h:41,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/bits/basic_string.h:6391,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/string:52,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/bits/locale_classes.h:40,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/bits/ios_base.h:41,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/ios:42,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/ostream:38,
 from /toolchains/gcc-8.2.0/include/c++/8.2.0/iostream:39,
 from variant.cpp:1:
/usr/include/stdlib.h:95:1: error: ‘__BEGIN_NAMESPACE_STD’ does not name a type
 __BEGIN_NAMESPACE_STD
 ^~~~~~~~~~~~~~~~~~~~~
/usr/include/stdlib.h:101:5: error: ‘div_t’ does not name a type; did you mean ‘pid_t’?
 } div_t;
 ^~~~~
 pid_t
/usr/include/stdlib.h:112:1: error: ‘__END_NAMESPACE_STD’ does not name a type
 __END_NAMESPACE_STD
 ^~~~~~~~~~~~~~~~~~~
/usr/include/stdlib.h:121:5: error: ‘lldiv_t’ does not name a type; did you mean ‘ldiv_t’?
 } lldiv_t;
 ^~~~~~~





c++ c++17 libstdc++




c++ c++17 libstdc++






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Mar 21 at 13:47









Florian Weimer

17.9k31148




17.9k31148










asked Mar 21 at 13:43









Kulluk007Kulluk007

151213




151213







  • 3





    This is not about libc, but libstdc++. Presumably the alternative toolchain was not installed correctly or correctly activated, and installed headers leak into the compilation. Check the use of your -I or -isystem flags. It could also be helpful to look at g++ -E output to determine which files were included from where.

    – Florian Weimer
    Mar 21 at 13:49











  • Thanks, @FlorianWeimer -- you are correct. This was an issue with a broken gcc build. I recompiled from scratch and everything just worked.

    – Kulluk007
    Mar 21 at 15:31












  • 3





    This is not about libc, but libstdc++. Presumably the alternative toolchain was not installed correctly or correctly activated, and installed headers leak into the compilation. Check the use of your -I or -isystem flags. It could also be helpful to look at g++ -E output to determine which files were included from where.

    – Florian Weimer
    Mar 21 at 13:49











  • Thanks, @FlorianWeimer -- you are correct. This was an issue with a broken gcc build. I recompiled from scratch and everything just worked.

    – Kulluk007
    Mar 21 at 15:31







3




3





This is not about libc, but libstdc++. Presumably the alternative toolchain was not installed correctly or correctly activated, and installed headers leak into the compilation. Check the use of your -I or -isystem flags. It could also be helpful to look at g++ -E output to determine which files were included from where.

– Florian Weimer
Mar 21 at 13:49





This is not about libc, but libstdc++. Presumably the alternative toolchain was not installed correctly or correctly activated, and installed headers leak into the compilation. Check the use of your -I or -isystem flags. It could also be helpful to look at g++ -E output to determine which files were included from where.

– Florian Weimer
Mar 21 at 13:49













Thanks, @FlorianWeimer -- you are correct. This was an issue with a broken gcc build. I recompiled from scratch and everything just worked.

– Kulluk007
Mar 21 at 15:31





Thanks, @FlorianWeimer -- you are correct. This was an issue with a broken gcc build. I recompiled from scratch and everything just worked.

– Kulluk007
Mar 21 at 15:31












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