herman ten brugge 30fd24abd4 Allow different names for pragma once ...

pragma once can now be used with
test.h
./test.h

and other references to the same file just like gcc/clang.

On linux we can use stat and st_ino to check for the same file.
On windows the st_ino does not work so we calculate a file hash
if the size of the file differs and then compare the hash.

2023-06-25 20:23:58 +02:00

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