There was an error in using the embedded LUNUX QT compiler. There is no clue. Please guide!

[SZB56]

I used QT5.15.5, the library and qmake generated by cross-compilation, and installed several QT components （QML and QtQuick2 according to the requirements of github ：Multimedia SVG SQL (SQLite v3), but SDL2 is not used）, to compile Pegasus source code. After many attempts, the following error is always prompted:

home/zanebey/pegasus-frontend/tests/backend/providers/pegasus/test_PegasusProvider.cpp: 在函数‘void {匿名}::verify_collected_files(const std::vector<model::Collection, std::allocator<model::Collection> >&, HashMap<QString, QStringList>&)’中: /home/zanebey/pegasus-frontend/tests/backend/providers/pegasus/test_PegasusProvider.cpp:92:22: 错误： expected unqualified-id before ‘[’ token for (const auto& [collname, expected_files] : expected_collection_files) { ^ /home/zanebey/pegasus-frontend/tests/backend/providers/pegasus/test_PegasusProvider.cpp:92:22: 错误： expected ‘;’ before ‘[’ token /home/zanebey/pegasus-frontend/tests/backend/providers/pegasus/test_PegasusProvider.cpp:92:23: 错误： ‘collname’在此作用域中尚未声明 for (const auto& [collname, expected_files] : expected_collection_files) { ^~~~ /home/zanebey/pegasus-frontend/tests/backend/providers/pegasus/test_PegasusProvider.cpp:92:33: 错误： ‘expected_files’在此作用域中尚未声明 for (const auto& [collname, expected_files] : expected_collection_files) { ^~~~~~ /home/zanebey/pegasus-frontend/tests/backend/providers/pegasus/test_PegasusProvider.cpp: 在 lambda 函数中: /home/zanebey/pegasus-frontend/tests/backend/providers/pegasus/test_PegasusProvider.cpp:92:49: 错误： expected ‘{’ before ‘:’ token for (const auto& [collname, expected_files] : expected_collection_files) { ^ /home/zanebey/pegasus-frontend/tests/backend/providers/pegasus/test_PegasusProvider.cpp: 在函数‘void {匿名}::verify_collected_files(const std::vector<model::Collection, std::allocator<model::Collection> >&, HashMap<QString, QStringList>&)’中: /home/zanebey/pegasus-frontend/tests/backend/providers/pegasus/test_PegasusProvider.cpp:92:49: 错误： expected ‘;’ before ‘:’ token /home/zanebey/pegasus-frontend/tests/backend/providers/pegasus/test_PegasusProvider.cpp:92:49: 错误： expected primary-expression before ‘:’ token /home/zanebey/pegasus-frontend/tests/backend/providers/pegasus/test_PegasusProvider.cpp:92:49: 错误： expected ‘)’ before ‘:’ token /home/zanebey/pegasus-frontend/tests/backend/providers/pegasus/test_PegasusProvider.cpp:92:49: 错误： expected primary-expression before ‘:’ token /home/zanebey/pegasus-frontend/tests/backend/providers/pegasus/test_PegasusProvider.cpp:89:44: 警告： unused parameter ‘collections’ [-Wunused-parameter] const std::vector<model::Collection*>& collections,

make[4]: [Makefile:1185：test_PegasusProvider.o] 错误 1 make[4]: 离开目录“/home/zanebey/pegasus-frontend/build/tests/backend/providers/pegasus” make[3]: [Makefile:52：sub-pegasus-make_first] 错误 2 make[3]: 离开目录“/home/zanebey/pegasus-frontend/build/tests/backend/providers” make[2]: [Makefile:152：sub-providers-make_first] 错误 2 make[2]: 正在等待未完成的任务....

make[4]: 离开目录“/home/zanebey/pegasus-frontend/build/tests/backend/model/memory” make[4]: 离开目录“/home/zanebey/pegasus-frontend/build/tests/backend/model/keyeditor” make[3]: 离开目录“/home/zanebey/pegasus-frontend/build/tests/backend/model” make[2]: 离开目录“/home/zanebey/pegasus-frontend/build/tests/backend” make[1]: [Makefile:49：sub-backend-make_first] 错误 2 make[1]: 离开目录“/home/zanebey/pegasus-frontend/build/tests” make: [Makefile:99：sub-tests-make_first] 错误 2

I hope someone can give me some advice, thank you!

[mmatyas]

Hi! It seems your C++ compiler does not support C++17. Some of the tests use C++17 code, so you will need a more recent compiler to build the project. For example, GCC 7, Clang 5, and VS 2017 or later should all support C++17.

[SZB56]

Yes, as you said, I replaced the compiler with gcc7.2 and solved this problem. Thank you very much for your guidance, thank you!