ldc2: Segmentation fault with -O

[patrickkh7788]

ldmd2 is run from termux32 with -O, remove -O it work fine.

LDC - the LLVM D compiler (1.12.0):
based on DMD v2.082.1 and LLVM 7.0.0
built with LDC - the LLVM D compiler (1.12.0)

[kinke]

Without any code for reproducibility, such a report is quite obviously useless.

[joakim-noah]

Can you run uname -m in Termux and report what it says? Also, you can try reducing the crashing code with the Dustmite tool.

[patrickkh7788]

Linux localhost 3.18.71-14176914 #1 SMP PREEMPT Wed Sep 19 10:57:01 KST 2018 armv8l Android

I will try Dustmite, not sure it can work on android.

[joakim-noah]

Hmm, haven't seen that reported before, ie armv8l, can you say what the device or CPU is? If it's a device running a 32-bit kernel, you may need to specify the CPU when building D code, ie add the -mcpu=cortex-a8 flag to your D command-line. You can always choose another 32-bit CPU arch as the baseline instead, but may need to recompile the runtime libraries for it using ldc-build-runtime.

[patrickkh7788]

@joakim-noah I forget to let you know, I am rung arm32 on a arm64 phone, because I can not find arm32 and I am not able to setup a cross build for arm32.

to do this is modify the termux to make sure it always return arm32 type from Java.

[joakim-noah]

OK, in that case, does adding the 32-bit CPU flag fix the segfault? It usually does for me on 32-bit ARM.

[patrickkh7788]

@joakim-noah
to build with -mcpu=cortex-a8, it work. Is the binary still can run on all arm32/arm64 android phone ?

[joakim-noah]

Yes, it should. If adding that flag fixes this issue for you, you can close it. I will more prominently emphasize it on the wiki.

[joakim-noah]

I've updated the wiki to emphasize that you should pass that cpu flag.