meson: for internal linkage, link to both libzstd and a static copy of it #3122
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
The poolTests program already linked to libzstd, and later to libtestcommon with included libzstd objects. So this was redundant. Minus 4 compile steps.
These need to be explicitly included as we use their private symbols, but we don't need to recompile them when we can reuse the existing objects. Minus 7 compile steps.
…f it Partial, Meson-only implementation of facebook#2976 for non-MSVC builds. Due to the prevalence of private symbol reuse, linking to a shared library is simply utterly unreliable, but we still want to defer to the shared library for installable applications. By linking to both, we can share symbols where possible, and statically link where needed. This means we no longer need to manually track every file that needs to be extracted and reused. The flip side is that MSVC completely does not support this, so for MSVC builds we just link to a full static copy even where -Ddefault_library=shared. As a side benefit, by using library inclusion rather than including extra explicit object files, the zstd program shrinks in size slightly (~4kb).
Cyan4973
approved these changes
Apr 29, 2022
Merged
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Partial, Meson-only implementation of #2976 for non-MSVC builds.
Due to the prevalence of private symbol reuse, linking to a shared library is simply utterly unreliable, but we still want to defer to the shared library for installable applications. By linking to both, we can share symbols where possible, and statically link where needed.
This means we no longer need to manually track every file that needs to be extracted and reused.
The flip side is that MSVC completely does not support this, so for MSVC builds we just link to a full static copy even where -Ddefault_library=shared.
As a side benefit, by using library inclusion rather than including extra explicit object files, the zstd program shrinks in size slightly (~4kb).