[cfe-dev] Bug (Regression) in clang trunk

[Fabio Fracassi]

Hello,

when compiling this code with today's trunk (r151919) clang (on Snow 
Leopard) crashes with an Assertion. It worked before (version form some 
month back). Anyone seen this or shall I file a bug?

Regards

Fabio

#include <boost/type_traits/is_const.hpp>  // from boost 1.46.1

template <typename Type>
struct Foo {
    bool isConst() const { return boost::is_const<Type>::value; }
};

struct Test {};

int main () {
    Foo<Test> h;
    bool b = h.isConst();
}

The output is:
/usr/local/bin/clang++ -v -I /usr/local/include/boost-1_46_1/ 
clang_crash.cpp  clang version 3.1 (trunk 151919)
Target: x86_64-apple-darwin10.8.0
Thread model: posix
  "/usr/local/bin/clang-3.0" -cc1 -triple x86_64-apple-macosx10.6.0 
-emit-obj -mrelax-all -disable-free -main-file-name clang_crash.cpp 
-pic-level 1 -mdisable-fp-elim -masm-verbose -munwind-tables -target-cpu 
core2 -v -resource-dir /usr/local/bin/../lib/clang/3.1 -I 
/usr/local/include/boost-1_46_1/ -fmodule-cache-path 
/var/folders/nG/nGiPDqRHGemu91F8AhkN2++++TI/-Tmp-/clang-module-cache 
-fdeprecated-macro -fdebug-compilation-dir 
/Users/fabio/Development/Playground -ferror-limit 19 -fmessage-length 
128 -stack-protector 1 -mstackrealign -fblocks 
-fobjc-dispatch-method=mixed -fcxx-exceptions -fexceptions 
-fdiagnostics-show-option -fcolor-diagnostics -o 
/var/folders/nG/nGiPDqRHGemu91F8AhkN2++++TI/-Tmp-/clang_crash-yeZWUT.o 
-x c++ clang_crash.cpp
clang -cc1 version 3.1 based upon LLVM 3.1svn default target 
x86_64-apple-darwin10.8.0
#include "..." search starts here:
#include <...> search starts here:
  /usr/local/include/boost-1_46_1
  /usr/include/c++/4.2.1
  /usr/include/c++/4.2.1/i686-apple-darwin10/x86_64
  /usr/include/c++/4.2.1/backward
  /usr/include/c++/4.0.0
  /usr/include/c++/4.0.0/i686-apple-darwin8
  /usr/include/c++/4.0.0/backward
  /usr/local/include
  /usr/local/bin/../lib/clang/3.1/include
  /usr/include
  /System/Library/Frameworks (framework directory)
  /Library/Frameworks (framework directory)
End of search list.
Assertion failed: (getOperand(0)->getType() == 
cast<PointerType>(getOperand(1)->getType())->getElementType() && "Ptr 
must be a pointer to Val type!"), function AssertOK, file 
/Users/fabio/Development/LLVM/llvm/lib/VMCore/Instructions.cpp, line 1056.
Stack dump:
0.    Program arguments: /usr/local/bin/clang-3.0 -cc1 -triple 
x86_64-apple-macosx10.6.0 -emit-obj -mrelax-all -disable-free 
-main-file-name clang_crash.cpp -pic-level 1 -mdisable-fp-elim 
-masm-verbose -munwind-tables -target-cpu core2 -v -resource-dir 
/usr/local/bin/../lib/clang/3.1 -I /usr/local/include/boost-1_46_1/ 
-fmodule-cache-path 
/var/folders/nG/nGiPDqRHGemu91F8AhkN2++++TI/-Tmp-/clang-module-cache 
-fdeprecated-macro -fdebug-compilation-dir 
/Users/fabio/Development/Playground -ferror-limit 19 -fmessage-length 
128 -stack-protector 1 -mstackrealign -fblocks 
-fobjc-dispatch-method=mixed -fcxx-exceptions -fexceptions 
-fdiagnostics-show-option -fcolor-diagnostics -o 
/var/folders/nG/nGiPDqRHGemu91F8AhkN2++++TI/-Tmp-/clang_crash-yeZWUT.o 
-x c++ clang_crash.cpp
1. <eof> parser at end of file
2.    Per-file LLVM IR generation
3.    clang_crash.cpp:5:9: Generating code for declaration 
'Foo<Test>::isConst'
4.    clang_crash.cpp:5:25: LLVM IR generation of compound statement ('{}')
clang-3: error: unable to execute command: Illegal instruction
clang-3: error: clang frontend command failed due to signal (use -v to 
see invocation)
clang-3: note: diagnostic msg: Please submit a bug report to 
http://llvm.org/bugs/ and include command line arguments and all 
diagnostic information.
clang-3: note: diagnostic msg: Preprocessed source(s) and associated run 
script(s) are located at:
clang-3: note: diagnostic msg: 
/var/folders/nG/nGiPDqRHGemu91F8AhkN2++++TI/-Tmp-/clang_crash-0n0c93.ii
clang-3: note: diagnostic msg: 
/var/folders/nG/nGiPDqRHGemu91F8AhkN2++++TI/-Tmp-/clang_crash-0n0c93.sh