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

[Benjamin Kramer]

On 02.03.2012, at 19:19, Fabio Fracassi wrote:

> 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?

This was a recent regression, the offending commit was reverted in r151922.

- Ben

> 
> 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
> 
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