bjc-r | The Beauty and Joy of Computing public resource repository | Reinforcement Learning library
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QUESTION
After updating to iOS 13.x / iPadOS 13.x we see sporadic crashes with our recent Testflight builds. We've not seen reports from users using our pre-13 released version yet, but it seems not many have updated to 13 yet, so we really don't know.
The app is a cordova-app with cordova-ios 5.0.2 using WkWebView. Data protection entitlement is set to full.
I have a hard time making sense of the crash, and it seems to be somewhere deep in the iOS-stack? The crash is sporadic and seems only to happen occasionally when the app has been put into the background.
I'm looking for some guidance/pointers on how to get to the bottom of this.
Crash report from TestFlight:
...ANSWER
Answered 2019-Oct-04 at 13:41It seems that the dyld3 saves the generated clojure files in the app tmp directory and if you use NSFileProtectionComplete the closure files have this property too.
To generate a crahs close the app, lock the phone, send a push that will wake up the app and then the crash is generated.
The solution seems to be simple, just change the permissions for the app tmp direcptry to NSFileProtectionCompleteUntilFirstUserAuthentication and the app will not crash. I really don't know why apple did this.
QUESTION
I am not clear on the assembler used by clang. AFAIK native aka GNU assembler and linker is used (provided along with gcc).
...ANSWER
Answered 2019-Aug-09 at 10:20LLVM has its own assembler called Integrated Assembler. It consists of several libraries and doesn't have a user-facing frontend (well, there is llvm-mc
, but it isn't really a replacement for as
). The llc
utility can invoke Integrated Assembler when passed -filetype=obj
option. This is also the reason you don't see any assembler program invocation when tracing execve
call.
Clang has -no-integrated-as
flag to turn the LLVM assembler off.
QUESTION
llvm, clang, libcxx/libcxxabi are built from source by me. they are located at usr/local
.
ANSWER
Answered 2018-Aug-22 at 02:09@jonathon
solve this problem in my this question.
The solutsion is setting both compiler and linker options so it can find libc++:
QUESTION
Edit: added output of $cc -v main.c
at the end of this post.
I'm using an old Xcode because my kernel extension will support El Capitan. That works with 8.3 by copying the 10.11 SDK from an older Xcode build.
...ANSWER
Answered 2018-Aug-10 at 07:06I Should Not Drink And Code:
My project had at first just one target, for a kernel extension. Later I added a second target for a command-line tool.
When I created a new source file for my command-line tool that source somehow got added to the kernel extension's target. Changing the tool's header search path settings had no effect on my problem because the source was not in the tool's target.
Kernel Extensions - device drivers - have headers that are only from Kernel.framework, in which there is no stdio.h file.
I'll shut up now.
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