Compilation Error: googlegtest fails with compilation error

Question

I'm using googlegtest for testing but when compiling I'm getting below error.

/gtest-printers.h:389:55: error: no member named 'u8string' in namespace 'std' GTEST_IMPL_FORMAT_C_STRING_AS_STRING_(char8_t, ::std::u8string);

/home/googletest/googletest/include/gtest/gtest-printers.h:379:40: note: expanded from macro 'GTEST_IMPL_FORMAT_C_STRING_AS_STRING_' class FormatForComparison<CharType*, OtherStringType> {

/home/googletest/googletest/include/gtest/gtest-printers.h:390:61: error: no member named 'u8string' in namespace 'std' GTEST_IMPL_FORMAT_C_STRING_AS_STRING_(const char8_t, ::std::u8string);

/home/googletest/googletest/include/gtest/gtest-printers.h:379:40: note: expanded from macro 'GTEST_IMPL_FORMAT_C_STRING_AS_STRING_' class FormatForComparison<CharType*, OtherStringType> {
2 errors generated.`

It's argument for a macro.

Compiler Version : Clang++ 11.1.0

Compiling inside googletest works but when included as header, compilation fails. Couldn't root cause reason for error?

Can you help why is linking happening to std?

make VERBOSE=1 output:

VERBOSE Output

Are you building with C++20 mode enabled? `std::u8string` is new in the C++20 standard, and it might not be enabled by default in Clang 11. — Some programmer dude, Apr 29 '21 at 09:03
Try with `make VERBOSE=1` and paste the output message will be helpful to find the root cause. — prehistoricpenguin, Apr 30 '21 at 02:56
Mine is GCC 7.5.0 , libstdc++.a doesn’t have u8string when I do nm/use/lib/x86_64/gnu/7/libstdc++.a | grep “u8string” . Still not sure about root cause — Genie, May 14 '21 at 10:43
@TheShmoo try installing sudo apt install libstdc++-11-dev libstdc++-11-doc — Genie, May 17 '21 at 04:31
Thank you for your hint! It was not gcc that caused this problem but the cross compilation with the integrated clang-tidy. — The Shmoo, May 26 '21 at 08:56

Anton Pilyak · Answer 1 · 2021-12-10T23:35:52.533

1

It turned out to be a gtest bug: wrong feature check macro is used in gtest-printers.h. As a temporary workaround, you can just edit the header, replacing cpp_char8_t for __cpp_lib_char8_t in a few places:

#ifdef cpp_char8_t // <---- should be changed to __cpp_lib_char8_t
//...std::u8string usage...
#endif

edited Dec 10 '21 at 23:35

answered Dec 09 '21 at 19:03

Anton Pilyak

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Compilation Error: googlegtest fails with compilation error

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