* Switch to yearless copyright per FB policy
* Fix up SPDX-License-Identifier lines in `contrib/linux-kernel` sources
* Add zstd copyright/license header to the `contrib/linux-kernel` sources
* Update the `tests/test-license.py` to check for yearless copyright
* Improvements to `tests/test-license.py`
* Check `contrib/linux-kernel` in `tests/test-license.py`
These are replaced by the corresponding context resets. When
converting resetCStream, CCtx_setPledgedSrcSize isn't called if the
source size is "unknown".
This helps reduce the reliance on "static only" symbols, as well as
reducing the use of deprecated functions.
Signed-off-by: Stephen Kitt <steve@sk2.org>
This commit addresses #2491.
Note that a downside of this solution is that it is global: `umask()` affects
all file creation calls in the process. I believe this is safe since
`fileio.c` functions should only ever be used in the zstd binary, and these
are (almost) the only files ever created by zstd, and AIUI they're only
created in a single thread. So we can get away with messing with global state.
Note that this doesn't change the permissions of files created by `dibio.c`.
I'm not sure what those should be...
The most common information that you want to track between begin() and
end() is the timestamp of the begin function, so you can measure the
duration of the (de)compression call. Allow the tracing library to put
this information inside the `ZSTD_TraceCtx`, so it doesn't need to keep
a global map in this case. If a single uint64_t is not enough, the
tracing library can return a unique identifier (like the context
pointer) instead, and use it as a key in a map.
This keeps the simple case simple.
ZSTD_cycleLog() is a very short function,
creating a rather large dependency onto libzstd's internal just for it is overkill.
Prefer duplicating this 2-lines function.
This PR makes the zstd CLI one step closer to being linkable to the dynamic library (see #2450)
More steps are still needed to reach this goal.
That was a subtle one :
VPATH is affecting search for both %.c source and %.o object files.
This meant that, when an object file already exists in lib/,
it's used in programs/,
even though programs/ is supposed to generate its own %.o object files.
With the new vpath directive, this is no longer the case :
the search is only activated for %.c source files.
Now, local programs/%.o are always generated
even if equivalent ones are already created in lib/.
It more clearly guarantees that lib/ and programs/ can use different compilation directives
without mixing resulting %.o object files.
Building the zstd CLI costs time.
Some part of it is incompressible, leading to substantial iteration delay when testing code modifications.
That's mainly because all source files from the library must be rebuilt from source every time.
The main reason we don't build the CLI from library object files
is that we can't just build the object directly in the lib/ directory
(which they would by default)
since they use different compilation flags.
Specifically, the CLI enables multithreading, while the library doesn't (by default).
This is solved in this commit, by generating the object files locally.
Now, the CLI and the library can employ different sets of flags, without tripping over each other.
All library object files are generated directly into programs/ dir.
This works because no 2 source files have the same name.
Now, modifying a file doesn't require to recompile the entire lib, just the modified files.
The recipe is also compatible with `-j` parallel build, leading to large build time reductions on multi-core systems.
