[ruby-core:103704] [Ruby master Bug#17511] Segmentation fault when compiled with -O2 or higher on ARM Android

Issue #17511 has been updated by xtkoba (Tee KOBAYASHI).


Just for the record, there turns out to be a Clang/LLVM bug in its `__builtin_longjmp` implementation for ARM Linux (more specifically for non-Darwin and non-Windows) for which there seems to be no reliable workaround on user's side.

https://bugs.llvm.org/show_bug.cgi?id=50202

----------------------------------------
Bug #17511: Segmentation fault when compiled with -O2 or higher on ARM Android
https://bugs.ruby-lang.org/issues/17511#change-91797

* Author: xtkoba (Tee KOBAYASHI)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [arm-linux-android]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
To reproduce a segmentation fault, compile Ruby with `CFLAGS=-Oz` using Android NDK r22 (Clang 11.0.5), and input the following:
```
require 'rubygems'
pp
```

A segmentation fault also occurs with `CFLAGS=-O2` when Up or Down key is pressed in IRB.

A workaround is to disable using `__builtin_setjmp`:
```
./configure --with-setjmp-type=setjmp
```

I have no idea if there are similar issues or not in non-Android Linux systems on 32-bit ARM.

Bug #14480 seems to suggest that there was a similar case on AArch64 Linux with GCC.


---Files--------------------------------
ruby-3.0.0-android-arm-__builtin_setjmp.patch (333 Bytes)
ruby-ec-volatile.patch (838 Bytes)


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