diff: fix enum value being out of allowed range #4680
Merged
Conversation
This file contains hidden or 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 C89 standard states in §6.7.2.2 "Enumeration specifiers": > The expression that defines the value of an enumeration constant shall > be an integer constant expression that has a value representable as an > int. On most platforms, this effectively limits the range to a 32 bit signed integer. The enum `git_diff_option_t` though recently gained an entry `GIT_DIFF_INDENT_HEURISTIC = (1u << 31)`, which breaks this limit. Fix the issue by using a gap in `git_diff_option_t`'s enum values. While this has the benefit of retaining our API, it may break applications which do not get recompiled after upgrading libgit2. But as we are bumping the soversion on each release anyway and thus force a recompile of dependents, this is not a problem.
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Outdated suggestions cannot be applied.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.
The C89 standard states in §6.7.2.2 "Enumeration specifiers":
On most platforms, this effectively limits the range to a 32 bit signed
integer. The enum
git_diff_option_tthough recently gained an entryGIT_DIFF_INDENT_HEURISTIC = (1u << 31), which breaks this limit.Fix the issue by using a gap in
git_diff_option_t's enum values. Whilethis has the benefit of retaining our API, it may break applications
which do not get recompiled after upgrading libgit2. But as we are
bumping the soversion on each release anyway and thus force a recompile
of dependents, this is not a problem.
Fixes #4657