5280b5c03e
libbase is a popular library that is used by many APEXes either directly or transitively. It is being used by several Mainline modules that were launched with Q, in which case everything in the APEX - including libbase - shouldn't use new APIs that are added post Q, i.e. R. libbase however is using a few new R symbols from liblog, and this is preventing those Q-launching Mainline modules that are built in R source tree from being installed to Q devices. Fortunately, the dependencies to the new R symbols are guarded with a flag; when the existence of the symbols are not guaranteed, it uses dlsym. This change fixes the aforementioned problem by turning on the flag also when libbase is built for an APEX. Bug: 149569129 Test: TARGET_BUILD_APPS=com.android.media vendor/google/build/build_mainline_modules.sh adb install --staged out/dist/mainline_modules_arm64/com.android.media.apex adb reboot The APEX is installed and mediaextractor process doesn't crash Change-Id: I44b5ec028850613cb45fc3e792f43cd8e87cfd00 |
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|---|---|---|
| .. | ||
| include/android-base | ||
| .clang-format | ||
| abi_compatibility.cpp | ||
| Android.bp | ||
| chrono_utils.cpp | ||
| chrono_utils_test.cpp | ||
| cmsg.cpp | ||
| cmsg_test.cpp | ||
| CPPLINT.cfg | ||
| endian_test.cpp | ||
| errors_test.cpp | ||
| errors_unix.cpp | ||
| errors_windows.cpp | ||
| expected_test.cpp | ||
| file.cpp | ||
| file_test.cpp | ||
| format_benchmark.cpp | ||
| liblog_symbols.cpp | ||
| liblog_symbols.h | ||
| logging.cpp | ||
| logging_test.cpp | ||
| macros_test.cpp | ||
| mapped_file.cpp | ||
| mapped_file_test.cpp | ||
| no_destructor_test.cpp | ||
| OWNERS | ||
| parsebool.cpp | ||
| parsebool_test.cpp | ||
| parsedouble_test.cpp | ||
| parseint_test.cpp | ||
| parsenetaddress.cpp | ||
| parsenetaddress_test.cpp | ||
| process.cpp | ||
| process_test.cpp | ||
| properties.cpp | ||
| properties_test.cpp | ||
| README.md | ||
| result_test.cpp | ||
| scopeguard_test.cpp | ||
| stringprintf.cpp | ||
| stringprintf_test.cpp | ||
| strings.cpp | ||
| strings_test.cpp | ||
| test_main.cpp | ||
| test_utils.cpp | ||
| test_utils_test.cpp | ||
| threads.cpp | ||
| utf8.cpp | ||
| utf8_test.cpp | ||
libbase
Who is this library for?
This library is a collection of convenience functions to make common tasks easier and less error-prone.
In this context, "error-prone" covers both "hard to do correctly" and "hard to do with good performance", but as a general purpose library, libbase's primary focus is on making it easier to do things easily and correctly when a compromise has to be made between "simplest API" on the one hand and "fastest implementation" on the other. Though obviously the ideal is to have both.
Should my routine be added?
The intention is to cover the 80% use cases, not be all things to all users.
If you have a routine that's really useful in your project, congratulations. But that doesn't mean it should be here rather than just in your project.
The question for libbase is "should everyone be doing this?"/"does this make everyone's code cleaner/safer?". Historically we've considered the bar for inclusion to be "are there at least three unrelated projects that would be cleaned up by doing so".
If your routine is actually something from a future C++ standard (that isn't yet in libc++), or it's widely used in another library, that helps show that there's precedent. Being able to say "so-and-so has used this API for n years" is a good way to reduce concerns about API choices.
Any other restrictions?
Unlike most Android code, code in libbase has to build for Mac and Windows too.
Code here is also expected to have good test coverage.
By its nature, it's difficult to change libbase API. It's often best to start using your routine just in your project, and let it "graduate" after you're certain that the API is solid.