This commit adds support for initializing `.anon_struct` types. There
is also some follow-up work to do for both tuples and structs regarding
comptime fields, so this also adds some tests to keep track of that
work.
Key blinding allows public keys to be augmented with a secret
scalar, making multiple signatures from the same signer unlinkable.
https://datatracker.ietf.org/doc/draft-dew-cfrg-signature-key-blinding/
This is required by privacy-preserving applications such as Tor
onion services and the PrivacyPass protocol.
The previous code here was potentially more optimal for some cases,
however, I never tested the perf, so it might not actually matter. This
code handles more cases. We can go back and re-evaluate that other
implementation if it seems worthwhile in the future.
This accomplishes two things:
* Works around #8442 by putting stage1-specific logic in to disable all
the std.json tests.
* Slightly reduces installation size of zig since std lib files ending
in "test.zig" are excluded from being installed.
Commit 3014a0d5f1dcbcfdcec3852ffd54f3c589fe3e83 added calling convention
validation, but left out thumb and thumbeb from the archs that can use the
ARM-specific calling conventions. This plus
a8a7f15106abef7c647d4de572a04b77ce048dd6 made compilation fail for thumb
targets.
The fstype argument to the mount system call can be null. To see an
example run "strace -e trace=mount unshare -m":
```
mount("none", "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0
...
```
Future improvement: make plain error notes actually render as notes
rather than errors, but keep them as errors for the case of
sub-compilation errors, e.g. when compiler-rt has compilation errors.
The previous definition depends on a non-lang-spec-compliant memory
layout for packed structs, which happens to trigger #11989 in stage2.
This commit changes the struct to be an extern struct with an
align(4) field. However, stage1 cannot handle this, so conditional
compilation logic is used to select different struct definitions
depending on stage1 vs stage2.
This works around #11989 but does not solve the underlying problem -
putting an extern union inside a packed struct will still trigger the
assert.
After this, both stage1 and stage2 std lib tests run assertion-clean
with a debug LLVM 13.
This is a prelude to a more elaborate work which will implement
`-dead_strip` flag - garbage collection of unreachable atoms. Here,
when sorting sections, we also check that the section is actually
populated with some atoms, and if not, we exclude it from the final
linked image. This can happen when we do not import any symbols
from dynamic libraries in which case we will not be populating
the stubs sections or the GOT table, implying we can skip allocating
those sections. Furthermore, we also make a check that a segment
is actually occupied too, with the exception of `__TEXT` segment
which is non-optional given that it wraps the header and load commands
and thus is required by the `dyld` to perform dynamic linking, and
`__PAGEZERO` which is generally non-optional when the linked image
is an executable. For any other segment, if its section count is
zero, we mark it as dead and skip allocating it and generating
a load command for it.
This commit also includes some minor improvements to the linker such
as refactoring of the segment allocating codepaths, skipping
`__PAGEZERO` generation for dylibs, and skipping generation of zero-sized
atoms for special symbols such as `__mh_execute_header` and `___dso_handle`.
These special symbols are only allocated local and global symbol pair
and their VM addresses is set to the start of the `__TEXT` segment,
but no `Atom` is created, as it's not necessary given that they never
carry any machine code.
Finally, we now always force-link against `libSystem` which turns out
to be required for `dyld` to properly handle `LC_MAIN` load command
on older macOS versions such as 10.15.7.
