support std.env package about nvc HOT 8 CLOSED

It's not actually possible to do this and remain compliant with VHDL-1993, which is what I'm aiming for at the moment. The LRM says:

The library denoted by the library logical name STD contains no library units other than package STANDARD and package TEXTIO.

Instead I've added, in commit d4a48db, a package nvc.sim which contains implementation of these procedures you can use instead. If/when I add -2008 support the std.env package can use the same implementation.

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just for my reference, nvc can remap nvc.sim as std.env by user after installing?
(of course, every users ultimately can do everything b/c nvc is under GPLv3 ATM.)
IIRC, ModelSim can remap library name, but can not remap package name.
IMHO, if nvc also can not remap package name, renaming nvc.sim to nvc.env would be better.

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could you mind to pull my issue41 branch?

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--enable-vhdl-2008 is now ready! 😁
could you mind to implement skipping unsupported regression to test/run_regr.rb?
im not so good at coding in ruby...

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I've added something temporary for now. I think I'm going to add a --std=X command line option to do this properly.

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OK, with the above commit and the few before it this should be handled slightly better:

Library names can now be suffixed with a minimum standard version. So there's now separate std and std.08 libraries installed. When compiling with --std=2008 the suffixed library std.08 is preferred and this one contains the STD.ENV package.

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nice!
then could you mind to pull my werror branch?
it contains a fix for --enable-werror on cygwin and additional ignore entry for in tree build.

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Thanks, merged it.

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