source_location

GCC and Clang compilers supported functionality needed for <source_location> header for a long long time, they just missed a proper header file. MSVC bundled header file just a few versions after the compiler support. If you happen to be a person using compiler supporting the functionality but with no bundled header file, this header is just for you.

Target audience of this header

Of course the library will work also with a newer compilers

compiler	since	until
GCC	7.1	11.0
Clang	9.0.0	12.0.1
MSVC	19.26	19.29

Compilers with <source_location> bundled

compiler	version	bundled
GCC	10.3	no
	11.0	yes
Clang	12.0.0	no
	12.0.1	yes
MSVC	19.28	no
	19.29	yes

Compilers with required functionality, but no header

compiler	version	functionality
GCC	4.7.4	no
	4.8.1	limited (line is not constexpr, column is not supported)
	7.1	almost (column not supported)
Clang	8.0.1	no
	9.0.0	yes
MSVC	19.25	no
	19.26	yes