iOS arm64 manages to crash LLVM

Péter Szilágyi peterke at
Thu Dec 3 17:28:54 UTC 2015

Hey all,

  This is probably not something that you guys can do much about, but
thought I'd ask anyway. I've successfully compiled gmplib to iOS ARMv7, but
when trying to do the same for ARM64, my compiler actually chokes with a
hard crash on the generated files. I really have no clue where the error
might come from so I figured I'd ping you too if you have any ideas. Note,
I can compile C/C++ programs with the compiler, so the issue isn't
necessarily a bad compiler.

  I configured with

CC=arm-apple-darwin11-clang ./configure --disable-shared
--host=aarch64-apple-darwin11 --disable-assembly

And on make install, it builds for a while, then crashes with:

libtool: compile:  arm-apple-darwin11-clang -DHAVE_CONFIG_H -I. -I..
-D__GMP_WITHIN_GMP -I.. -DOPERATION_divrem -mfpu=neon -O2 -pedantic
-DNO_ASM -c divrem.c -o divrem.o
clang: warning: argument unused during compilation: '-mfpu=neon'
0 0x00007fa1a7ff0572
llvm::sys::PrintStackTrace(_IO_FILE*) + 50
1 0x00007fa1a7feecb9
2  0x00007fa1a70c1d10
3 0x00007fa1a7dff927
llvm::MachineInstr::addOperand(llvm::MachineFunction&, llvm::MachineOperand
const&) + 23
4 0x00007fa1a871b725
llvm::ilist_iterator<llvm::MachineInstr> >, unsigned int, bool, int,
llvm::TargetRegisterClass const*, llvm::TargetRegisterInfo const*) const +
5 0x00007fa1a7d81bcc
6 0x00007fa1a7d85b30
7 0x00007fa1a7e79030
8 0x00007fa1a7e7ccfb
9 0x00007fa1a7e6b4f6
llvm::RegAllocBase::allocatePhysRegs() + 198
10 0x00007fa1a7e7d88c
11 0x00007fa1a79daa97
llvm::FPPassManager::runOnFunction(llvm::Function&) + 487
12 0x00007fa1a79dad2b
llvm::FPPassManager::runOnModule(llvm::Module&) + 43
13 0x00007fa1a79da6f4
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 772
14 clang            0x0000000000872c43
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&,
llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::raw_ostream*) +
15 clang            0x00000000008632fb
16 clang            0x0000000000a21a2a clang::ParseAST(clang::Sema&, bool,
bool) + 826
17 clang            0x00000000006dc1c6 clang::FrontendAction::Execute() +
18 clang            0x00000000006b5669
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 313
19 clang            0x000000000069c613
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1939
20 clang            0x0000000000697ae8 cc1_main(llvm::ArrayRef<char
const*>, char const*, void*) + 1304
21 clang            0x0000000000694b62 main + 962
22        0x00007fa1a676ea40 __libc_start_main + 240
23 clang            0x00000000006970b9 _start + 41
Stack dump:
0. Program arguments: /usr/lib/llvm-3.6/bin/clang -cc1 -triple
arm64-apple-ios6.0.0 -Wdeprecated-objc-isa-usage
-Werror=deprecated-objc-isa-usage -Werror=implicit-function-declaration
-emit-obj -disable-free -disable-llvm-verifier -main-file-name divrem.c
-mrelocation-model pic -pic-level 2 -mthread-model posix -mdisable-fp-elim
-masm-verbose -target-cpu cyclone -target-feature +neon -target-feature
+crc -target-feature +crypto -target-feature +zcm -target-feature +zcz
-target-abi darwinpcs -target-linker-version 253.3 -dwarf-column-info
-coverage-file /deps-build/gmp-6.1.0/mpn/divrem.o -resource-dir
/usr/lib/llvm-3.6/bin/../lib/clang/3.6.2 -isysroot
/usr/local/ios-ndk-arm64/bin/../SDK -D HAVE_CONFIG_H -D __GMP_WITHIN_GMP -D
OPERATION_divrem -D NO_ASM -I . -I .. -I .. -O2 -pedantic
-fdebug-compilation-dir /deps-build/gmp-6.1.0/mpn -ferror-limit 19
-fmessage-length 0 -stack-protector 1 -mstackrealign
-fallow-half-arguments-and-returns -fblocks -fobjc-runtime=ios-6.0.0
-fencode-extended-block-signature -fmax-type-align=16
-fdiagnostics-show-option -vectorize-loops -vectorize-slp -o divrem.o -x c
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module 'divrem.c'.
4. Running pass 'Greedy Register Allocator' on function '@__gmpn_divrem'
clang: error: unable to execute command: Segmentation fault (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see
Ubuntu clang version 3.6.2-1 (tags/RELEASE_362/final) (based on LLVM 3.6.2)
Target: aarch64-apple-darwin11
Thread model: posix
clang: note: diagnostic msg: PLEASE submit a bug report to and include the crash backtrace, preprocessed
source, and associated run script.
clang: note: diagnostic msg:

Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/divrem-7d3b68.c
clang: note: diagnostic msg: /tmp/
clang: note: diagnostic msg:

Makefile:492: recipe for target 'divrem.lo' failed
make[2]: Leaving directory '/deps-build/gmp-6.1.0/mpn'
make[2]: *** [divrem.lo] Error 1
Makefile:954: recipe for target 'install-recursive' failed
make[1]: Leaving directory '/deps-build/gmp-6.1.0'
Makefile:1254: recipe for target 'install' failed
make[1]: *** [install-recursive] Error 1
make: *** [install] Error 2

The two files mentioned by the crash report can be found at:


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