[LLVMbugs] [Bug 14317] New: Clang crashes during Blocks rewrite (-rewrite-objc)

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Sun Nov 11 10:35:47 PST 2012


             Bug #: 14317
           Summary: Clang crashes during Blocks rewrite (-rewrite-objc)
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: bugzilla-clang at sogetthis.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 9525
  --> http://llvm.org/bugs/attachment.cgi?id=9525
Preprocessed source as requested in Clang debug output

I'm trying to use Clang's blocks support on Linux and therefore I got the pure
BlocksRuntime [https://github.com/mackyle/blocksruntime/] and compiled it. Next
I learned that blocks are rewritten into normal C++ by Clang and that
"-rewrite-objc" will show the rewritten code. This worked fine until I tried it
with one of the test cases

Clang crashes on this one:

0  clang 0x099ac558
Stack dump:
0.    Program arguments: /home/me/Compiler/llvm/bin/bin/clang -cc1 -triple
i386-pc-linux-gnu -rewrite-objc -disable-free -disable-llvm-verifier
-main-file-name recursive-block.c -mrelocation-model static -mdisable-fp-elim
-fmath-errno -masm-verbose -mconstructor-aliases -target-cpu pentium4
-target-linker-version -momit-leaf-frame-pointer -resource-dir
/home/me/Compiler/llvm/bin/bin/../lib/clang/3.2 -fdebug-compilation-dir
/home/me/Compiler/blocksruntime/BlocksRuntime/tests -ferror-limit 19
-fmessage-length 143 -mstackrealign -fblocks -fobjc-runtime=macosx
-fno-objc-infer-related-result-type -fdiagnostics-show-option
-fcolor-diagnostics -o recursive-block.cpp -x objective-c++-cpp-output
1.    recursive-block.c:46:1: current parser token 'int'
clang: error: unable to execute command: Segmentation fault
clang: error: clang frontend command failed due to signal (use -v to see
clang version 3.2 (trunk 167691)
Target: i386-pc-linux-gnu
Thread model: posix

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