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cli : Display supported formats on -vV command

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Requested and inspired by patch from @ib (#771)
This commit is contained in:
Yann Collet
2017-08-19 13:33:50 -07:00
parent f7312a7cb4
commit 1c108c811e
6 changed files with 55 additions and 20 deletions
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programs/README.md
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@@ -11,7 +11,7 @@ There are however other Makefile targets that create different variations of CLI
#### Compilation variables
`zstd` tries to detect and use the following features automatically :
`zstd` scope can be altered by modifying the following compilation variables :
- __HAVE_THREAD__ : multithreading is automatically enabled when `pthread` is detected.
It's possible to disable multithread support, by setting HAVE_THREAD=0 .
@@ -40,6 +40,17 @@ There are however other Makefile targets that create different variations of CLI
In which case, linking stage will fail if `lzma` library cannot be found.
This might be useful to prevent silent feature disabling.
- __ZSTD_LEGACY_SUPPORT__ : `zstd` can decompress files compressed by older versions of `zstd`.
Starting v0.8.0, all versions of `zstd` produce frames compliant with the [specification](../doc/zstd_compression_format.md), and are therefore compatible.
But older versions (< v0.8.0) produced different, incompatible, frames.
By default, `zstd` supports decoding legacy formats >= v0.4.0 (`ZSTD_LEGACY_SUPPORT=4`).
This can be altered by modifying this compilation variable.
`ZSTD_LEGACY_SUPPORT=1` means "support all formats >= v0.1.0".
`ZSTD_LEGACY_SUPPORT=2` means "support all formats >= v0.2.0", and so on.
`ZSTD_LEGACY_SUPPORT=0` means _DO NOT_ support any legacy format.
if `ZSTD_LEGACY_SUPPORT >= 8`, it's the same as `0`, since there is no legacy format after `7`.
Note : `zstd` only supports decoding older formats, and cannot generate any legacy format.
#### Aggregation of parameters
CLI supports aggregation of parameters i.e. `-b1`, `-e18`, and `-i1` can be joined into `-b1e18i1`.