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Even though the toolchain implicitly links against -lc, it does not know
where it should get LibC from except for the sysroot. In the case of
Clang this causes it to pick up the LibC stub instead, which might be
slightly outdated and feature missing symbols.
This is currently not an issue that manifests because we pass through
the dependency on LibC and other libraries by accident, which causes
CMake to link against the LibC target (instead of just the library),
and thus points the linker at the build output directory.
Since we are looking to fix that in the upcoming commits, let's make
sure that everything will still be able to find the proper LibC first.
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Now that we have OS macros for essentially every supported OS, let's try
to use them everywhere.
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This commit moves the length calculations out to be directly on the
StringView users. This is an important step towards the goal of removing
StringView(char const*), as it moves the responsibility of calculating
the size of the string to the user of the StringView (which will prevent
naive uses causing OOB access).
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LibMain is dynamically linked in every binary. This results in a
slightly slower load time. In the past people have pegged this at 0.7
ms on some hardware.
This change makes it statically linked and eliminates 0.6 ms of
run-time on my machine. This is tested by running a script which just
executed `/bin/true` in a loop 10,000 times. Before this patch it
reliably executed in ~90,000 ms. After this patch it is ~84,000
ms. This is a speed up of 6,000 ms over 10,000 executions, or 0.6 ms
per execution.
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Some POSIX utilities are specified to return a specific value on error,
which is not 1. `Main::set_return_code_for_errors()` lets you set it to
that value.
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Rather than finding apps that benefit from time zone awareness one-by-
one, and calling tzset in their serenity_main, let's do it in LibMain.
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Stealing what Andreas did for the `dbgln` output, I think it also looks
nice inside of Terminal :^)
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When on Lagom, `warnln` and `dbgln` both output to `stderr`. This makes
runtime errors duplicated and more verbose than necessary.
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And let's make them red too, to help us notice them. :^)
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Print the full associated string metadata by default (if available.)
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Before this change, we would need to write arguments.arguments to access
the Span<>, which doesn't feel too pretty.
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This creates an error that contains the name of the syscall that failed.
This allows error handlers to print out the name of the call if they
want to. :^)
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By linking with LibMain, your program no longer needs to provide main().
Instead, execution begins in this function:
ErrorOr<int> serenity_main(Main::Arguments);
This allows programs that link with LibMain to use TRY() already in
their entry function, without having to do manual ErrorOr unwrapping.
This is very experimental, but it seems like a nice idea so let's try it
out. :^)
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