For a Unix-style installation, change the default mode to put
"compiled" directories under "lib" instead of "shared", since they're
architecture-specific for Racket CS.
This installation mode relies on the new 'compiled-file-roots config
entry. The installation process updates "config.rktl" so that
`current-compiled-file-roots` is initialized to find ".zo" files under
"lib".
Use `--enable-sharezo` to get the old behavior, either for installing
Racket BC or if you want to ignore "lib"-vs.-"share" guidelines to
simplify the installation.
If a Git package source does not include "#" followed by a ref, then
use the branch/commit designated by a server as the default branch or
commit (i.e., the one for the "HEAD" symref), instead of assuming the
branch "master".
This is technically a backward-incompatible change to the
interpretation of Git package sources, but explicit branch
specification continues to work the same. For the forseeable future,
to support recent versions, packages in a branch other than "master"
will still need to be specified using the branch name, such as
including "#main" at the end of the package source. Eventually,
relevant versions of Racket will support the new default.
Relevant to #3672
Also, change the default ref from "master" to 'head. This is
technically a backward-incompatible change, but so far it seems more
likely to make things work right than to break them.
In Racket BC, callbacks don't have to be atomic, and it's ok for the
callback to raise an exception (as long as the foreign library is ok
with a longjmp escape). Using `#:callback-exns? #t` on a foreign
callout in both CS and BC allows an atomic callback (invoked during
the foreign call) to raise an exception. Terms and conditions apply.
When a string is large enough, its conversion to bytes is internally
streamed, and `regexp-match/end` did not get the match-ending bytes
correctly.
Closes#3684
The predicate for a seald structure type can be faster than a
predicate for a non-sealed structure type, and Chez Scheme takes
advantage of that opportunity.
The BC JIT could be improved to take advanatge of sealed structure
types, but it isn't.
This commit also fixes CS checking of a supertype for certain shapes
of prefab struct-type declarations.
Saving and restoring the signal-mask state does not work right, since
rktio itself may block SIGCHLD in some cases, and it doesn't seem
useful/right to preserve the mask after fork.
The docs currently state that `flat-contract-predicate` is merely a holdover for backwards compatibility, and that flat contracts can be used directly as predicates now. This isn't correct: _some_ flat contracts can be used directly as predicates, but not all. Ordinary racket values that double as contracts such as numbers and symbols can't be used as predicates without using `flat-contract-predicate`. Additionally, this pull request directs users to `coerce-flat-contract` if they're seeking to build contract combinators that explicitly convert ordinary racket values into flat contracts.
Context: racket/scribble#293.
