CODEWITHSUNDEEP
c++linuxgcclibstdc++
Irbis
Irbis

Reputation: 1491

-fshort-wchar and std::wstring - segmentation fault

I use Ubuntu 18.04 and gcc 7.5.0. I have a library which is compiled with -fshort-wchar. I have noticed that using std::wstring in the library may leads to the segmentation fault. I have found a similar topic. There is an explanation:

-fshort-wchar is not usable if you want to interact with any part of the standard library or third-party library code using the correct (32-bit) definition of wchar_t.

I understand that I can't use std::wstring when a library is compiled with -fshort-wchar but what with the other standard library content ? Why I can't interact with any part of the standard library, for example std::vector ?

Upvotes: 1

Views: 226

Answers (1)

Ted Lyngmo
Ted Lyngmo

Reputation: 117298

-fshort-wchar          sets the size of wchar_t to 2 bytes

Now think about what will happen if you use a part of the standard library that is not header only. A big part of the standard library is compiled into a library that you link with (libstdc++ / libc++). When that was compiled -fshort-wchar was not used and the size of the wchar_t is therefore 4 bytes in the library.

Upvotes: 3

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