Rework GNU -m flags
#1269
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Rework GNU -m flags
#1269
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We do this by storing the default target features in `TargetInfo`.
They should be redundant, the `--target` parameter contains the information already.
And prepare for adding more architecture-specific flags. There are no functional changes here (apart from the `-m32`/`-m64` flags appearing slightly later in the command line, but that shouldn't have any effect).
It is unsound to call between code built with different floating point modes, so let's make sure we pass this flag correctly.
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WIP: Rework GNU
-mflags to be more robust and better support compilation to different CPU architecture configurations (hard/soft float, endianess, CPU features, sub-architecture, etc.).Builds upon #1266.
Once done:
Replaces part of #791.
Replaces #796.
Replaces #871.
Fixes #710.
Probably fixes #984.
Maybe the GCC part of #268.