b8e1ecdd6b
Cast checks are slow. We seem to have some rough consensus that they are important for debug builds, but not for release builds. Problem is, very few apps define G_DISABLE_CAST_CHECKS for release builds. Worse, it's undocumented, so there's no way apps could even be expected to know about it. We can get the right default is almost all situations by making this depend on the __OPTIMIZE__ preprocessor definition. This is a GCC-specific thing, although Clang supports it too. If the compiler does not define __OPTIMIZE__, then this commit does no harm: you can still use G_DISABLE_CAST_CHECKS as before. When checking __OPTIMIZE__, we are supposed to ensure our code has the same behavior as it would if we do not, which will be true except in case the check fails (which is programmer error). Downside: this will not automatically do the right thing with -Og, because __OPTIMIZE__ is always defined to 1. We don't want to disable cast checks automatically if using -O0 or -Og. There's no way to automatically fix this, but we can create an escape hatch by allowing you to define G_DISABLE_CAST_CHECKS=0 to force-enable cast checks. In practice, I don't think this matters much because -Og kinda failed: GCC's man page says it should be a superior debugging experience to -O0, but it optimizes variables away so it's definitely not. Another downside: this is bad if you really *do* want cast checks in release builds. The same solution applies: define G_DISABLE_CAST_CHECKS=0 and you'll get your cast checks. |
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|---|---|---|
| .gitlab-ci | ||
| .reuse | ||
| docs | ||
| fuzzing | ||
| gio | ||
| glib | ||
| gmodule | ||
| gobject | ||
| gthread | ||
| LICENSES | ||
| m4macros | ||
| po | ||
| subprojects | ||
| tests | ||
| tools | ||
| .clang-format | ||
| .dir-locals.el | ||
| .editorconfig | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .gitmodules | ||
| .lcovrc | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| COPYING | ||
| glib.doap | ||
| HACKING | ||
| INSTALL.md | ||
| meson_options.txt | ||
| meson.build | ||
| msvc_recommended_pragmas.h | ||
| NEWS | ||
| README.md | ||
| README.win32.md | ||
| SECURITY.md | ||
GLib
GLib is the low-level core library that forms the basis for projects such as GTK and GNOME. It provides data structure handling for C, portability wrappers, and interfaces for such runtime functionality as an event loop, threads, dynamic loading, and an object system.
The official download locations are: https://download.gnome.org/sources/glib
The official web site is: https://www.gtk.org/
Installation
See the file 'INSTALL.md'
Supported versions
Only the most recent unstable and stable release series are supported. All older versions are not supported upstream and may contain bugs, some of which may be exploitable security vulnerabilities.
See SECURITY.md for more details.
Documentation
API documentation is available online for GLib for the:
Discussion
If you have a question about how to use GLib, seek help on GNOME’s Discourse
instance. Alternatively, ask a question
on StackOverflow and tag it glib.
Reporting bugs
Bugs should be reported to the GNOME issue tracking system. You will need to create an account for yourself. You may also submit bugs by e-mail (without an account) by e-mailing incoming+gnome-glib-658-issue-@gitlab.gnome.org, but this will give you a degraded experience.
Bugs are for reporting problems in GLib itself, not for asking questions about how to use it. To ask questions, use one of our discussion forums.
In bug reports please include:
- Information about your system. For instance:
- What operating system and version
- For Linux, what version of the C library
- And anything else you think is relevant.
- How to reproduce the bug.
- If you can reproduce it with one of the test programs that are built
in the
tests/subdirectory, that will be most convenient. Otherwise, please include a short test program that exhibits the behavior. As a last resort, you can also provide a pointer to a larger piece of software that can be downloaded.
- If you can reproduce it with one of the test programs that are built
in the
- If the bug was a crash, the exact text that was printed out when the crash occurred.
- Further information such as stack traces may be useful, but is not necessary.
Contributing to GLib
Please follow the contribution guide to know how to start contributing to GLib.
Patches should be submitted as merge requests to gitlab.gnome.org. If the patch fixes an existing issue, please refer to the issue in your commit message with the following notation (for issue 123):
Closes: #123
Otherwise, create a new merge request that introduces the change. Filing a separate issue is not required.
Default branch renamed to main
The default development branch of GLib has been renamed to main. To update
your local checkout, use:
git checkout master
git branch -m master main
git fetch
git branch --unset-upstream
git branch -u origin/main
git symbolic-ref refs/remotes/origin/HEAD refs/remotes/origin/main