Clang format produces code which does not compile with clang

[SamCoutteauHybrid]

When using the clang-format options:

IntegerLiteralSeparator:
  BinaryMinDigits: 16
  Binary: 8
  Decimal: 3
  DecimalMinDigits: 6
  Hex: 2
  HexMinDigits: 8

To insert decimal separators it can produce the following code.

#if __cpp_lib_source_location < 201'907L

where a decimal separator is added in the preprocessor constant.

It seems clang cannot compile this unless at least c++14 is used.

https://godbolt.org/z/f1zYWd778

However even when setting:

Standard: c++11 

clang format still adds the decimal separator.

Further more

#if __cpp_lib_source_location < 201'907L
#endif

works using:

• clang -std=c++14 -E test.hpp

does not work using

• clang -std=c++11 -E test.hpp
• clang-scan-deps -format=p1689 -- clang -std=c++14 test.hpp

So it seems clang-format is producing wrong results and clang-scan-deps is ignoring -std=c++14

[llvmbot]

@llvm/issue-subscribers-clang-format

Author: None (SamCoutteauHybrid)

When using the clang-format options: ``` IntegerLiteralSeparator: BinaryMinDigits: 16 Binary: 8 Decimal: 3 DecimalMinDigits: 6 Hex: 2 HexMinDigits: 8 ```

To insert decimal separators it can produce the following code.

#if __cpp_lib_source_location < 201'907L

where a decimal separator is added in the preprocessor constant.

It seems clang cannot compile this unless at least c++14 is used.

https://godbolt.org/z/f1zYWd778

However even when setting:

Standard: c++11 

clang format still adds the decimal separator.

Further more

#if __cpp_lib_source_location < 201'907L
#endif

works using:

• clang -std=c++14 -E test.hpp

does not work using

• clang -std=c++11 -E test.hpp
• clang-scan-deps -format=p1689 -- clang -std=c++14 test.hpp

So it seems clang-format is producing wrong results and clang-scan-deps is ignoring -std=c++14