fix: missing backtrace when using std::backtrace::Backtrace on Android #129305
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These commits modify the If this was unintentional then you should revert the changes before this PR is merged. |
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library/std/build.rs
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| // Used to detect the value of the `__ANDROID_API__` | ||
| // builtin #define | ||
| const MARKER: &str = "BACKTRACE_RS_ANDROID_APIVERSION"; | ||
| const ANDROID_API_C: &str = " | ||
| BACKTRACE_RS_ANDROID_APIVERSION __ANDROID_API__ | ||
| "; | ||
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| // Create `android-api.c` on demand. | ||
| let out_dir = env::var_os("OUT_DIR").unwrap(); | ||
| let android_api_c = Path::new(&out_dir).join("android-api.c"); |
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Suggestion: could we leave a remark for why this is needed, and if possible link to some docs or references for this? Even if it's just what backtrace-rs does I think it'd still be useful. I'm guessing we're trying to detect minimum Android API version, but this isn't super obvious as to why this dance is needed.
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r? @jieyouxu |
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It seems to cause issues for projects building the standard library with non-cargo build systems. See #116705 |
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I believe that since #120593, 21 is the minimum supported API level so we should be able to unconditionally enable the |
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I assume that with rust-lang/backtrace-rs#656, this PR is no longer needed? |
It seems that it is not need. After this PR is merged, do we need to upgrade the |
Since rust-lang/rust#120593 the minimum android API level is 21. Related: https://github.com/android/ndk/wiki/Changelog-r26 rust-lang/rust#129305 1. stop setting `dl_iterate_phdr` based on whether the android API level is greater than or equal to 21, but retain it for back compat. 2. remove `cc` build dependency. 3. upgrade ndk r25b to r26d in CI.
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We can first set |
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Since this is fixed upsteam, I'd prefer if we just upgraded directly to the latest version of backtrace-rs. Otherwise this hack is likely to get forgotten and stay for a long time. |
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Closing since this is solved by updating backtrace-rs. |
This pr will fix #121033.
Cause of the problem
backtrace-rsis introduced into the std lib in this way, which will cause the build.rs of backtrace-rs to not be executed, and thedl_iterate_phdrfeature will not be set. Ultimately, the stack information on android cannot be obtained.Solution
Since #120593, the minimum Android API level change from 19 to 21. And Android supports
dl_iterate_phdrsince API level 21. Please see https://android.googlesource.com/platform/bionic/+/HEAD/docs/status.md for details. So we can enabledl_iterate_phdrfeature for Android without checking the Android API level.