gcc throws fatal error: unordered_map.h: No such file or directory on #include . I am using CMAKE, and gcc 4.8.5 compiler.
main:
#include "a.h"
...
void main() { ...}
a.h:
#include <unordered_map>
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Mikan
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1Did you compile with c++0x/c++11 enabled? – NathanOliver Jul 22 '19 at 20:06
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[`
` is a c++11 feature](https://en.cppreference.com/w/cpp/container/unordered_map) if you set the standard to something more modern it'll work – Mgetz Jul 22 '19 at 20:06 -
Have you read https://www.gnu.org/software/gcc/gcc-4.8/cxx0x_status.html ? – SergeyA Jul 22 '19 at 20:06
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1`unordered_map` requires C++11 source: https://en.cppreference.com/w/cpp/container/unordered_map – Richard Critten Jul 22 '19 at 20:06
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This [answer may be useful](https://stackoverflow.com/a/39505520/332733) as to how to set a flag in Cmake – Mgetz Jul 22 '19 at 20:48
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I wasn't able to cross reference, but it says that unordered_map was introduced in C++11.
Source: https://en.cppreference.com/w/cpp/container/unordered_map
Patrick Poitras
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