在 2022-11-20 20:53, Pali Rohár 写道:
Hello! I would like to propose a new parameter for gcc: -mcrtdll= to allow specifying against which Windows C Runtime library should be binary linked. On Windows there are more crt libraries and currently gcc links to libmsvcrt.a which is in most cases symlink to libmsvcrt-os.a (but can be changed, e.g. during mingw-w64 building). mingw-w64 project already builds import .a library for every crt dll library (from the old crtdll.dll up to the new ucrtbase.dll), so it is ready for usage. Simple patch for gcc which implements -mcrtdll parameter is below. Note that on internet are other very similar patches for -mcrtdll= parameters and some are parts of custom mingw32 / mingw-w64 gcc builds. What do you think? Could gcc have "official" support for -mcrtdll= parameter?
It's not enough to just link against the desired library, you will also have to define `__MSVCRT_VERSION__` accordingly (for UCRT it should be defined as `0xE00` i.e. 14.0).
The current status of such mechanism is that both the macro `__MSVCRT_VERSION__` and the library 'libmsvcrt.a' are determined when building mingw-w64, configurable by `--with-default-msvcrt=`, so they always match.
[1] https://sourceforge.net/p/mingw-w64/mailman/message/36030072/ -- Best regards, LIU Hao
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