| Issue |
167037
|
| Summary |
LLD link command taking longer than usual unless you disable CFI
|
| Labels |
lld
|
| Assignees |
|
| Reporter |
Sharjeel-Khan
|
In Android, we have been noticing a few builds taking longer than usual (10-20 mins) at linking steps. When we disabled CFI, those same builds would take few seconds. I am no sure why CFI is causing the big difference.
I have attached reproducer for a specific test in AOSP to showcase the difference for both the CFI (`repro-cfi-*.tar`) and non-CFI (`repro-no-cfi-*.tar`) versions. You can just run `ld.lld @response.txt` after running `tar -xf <tar-file>`. There is both a 64-bit version and 32-bit version of the test. In addition, I attached the tests' bitcodes when we build with CFI because it might be due to other passes since Android has LTO on by default. Here is the link: https://drive.google.com/drive/folders/1i2tLBUJAnoGJkqtuJpGA9PUwmv1856DO?usp=sharing
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