[cfe-dev] Fwd: clang++ vs g++ compilation speed for ace-tao servants

[Tomasz Mikolajczyk]

Are you able to compile ACE+TAO? I tried once (using clang 3.3) and noticed
that clang complains on operator<< overloaded for some corba magic (do not
remember the details now). The entire quality of the tao implementation is
questionable.

Regards,
Tomek


On Thu, Oct 31, 2013 at 7:59 AM, Igor Vagulin <igor.vagulin at gmail.com>wrote:

> Hi All,
>
> We are evaluating switch to clang from gcc for our c++ application.
> Main focus is compilation speed, but we also look at address/memory
> sanitizer, c++11 support and c++ modules. I've tried to compile our
> project with clang++ but resulting compilation time is more than with
> gcc. Can someone give me a hint where might be a problem?
>
> Our project is bunch of ace-tao corba servants. Overall time with
> clang++ is about twice more than with gcc. To reproduce problem I
> preprocesssed one file and then compile it, result same - twice longer
> compilation. Don't know where to look further.
> [root at ivagulin-pc ~]# time clang++ -c RemoveClusterObserverClang.cpp
> real    0m1.283s
> user    0m1.254s
> sys    0m0.024s
> [root at ivagulin-pc ~]# time g++ -c RemoveClusterObserverGcc.cpp
> real    0m0.576s
> user    0m0.524s
> sys    0m0.048s
>
> I use llvm-3.3 and cfe-3.3 compiled with folowing options. Sources of
> RemoveClusterObserver*cpp attached.
> + cmake -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Release
> '-DCMAKE_CXX_FLAGS_RELEASE=-O3 -g -mtune=amdfam10 -march=i686'
> '-DCMAKE_C_FLAGS_RELEASE=-O3 -g -mtune=amdfam10 -march=i686'
> -DCMAKE_EXE_LINKER_FLAGS_RELEASE=-Wl,--as-needed -Wl,--strip-all'
> '-DCMAKE_MODULE_LINKER_FLAGS_RELEASE=-Wl,--as-needed -Wl,--strip-all'
> '-DCMAKE_SHARED_LINKER_FLAGS_RELEASE=-Wl,--as-needed -Wl,--strip-all
> -shared' -DCMAKE_SKIP_RPATH=YES -DBUILD_SHARED_LIBS=YES
> -DLLVM_ENABLE_TIMESTAMPS=NO ..
>
> Igor Vagulin
>
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>
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