llvm dev - Feb 2010 - [LLVMdev] Labeling builds as Release/Debug (was: -version displays DEBUG on Visual C++ release build)

C:\llvm\bin>llc -version
Low Level Virtual Machine (http://llvm.org/):
  llvm version 2.6svn
  DEBUG build.
  Built Jan 31 2010(20:46:01).

  Registered Targets:
    x86    - 32-bit X86: Pentium-Pro and above
    x86-64 - 64-bit X86: EM64T and AMD64

I did specify the release build with cmake; the lack of crashing on
exit of programs compiled therewith confirms that :-) As far as I can
see, the reason for the incorrect reporting is in CommandLine.cpp:

#ifndef __OPTIMIZE__
        cout << "DEBUG build";
#else
        cout << "Optimized build";
#endif

According to a Google search, gcc sets __OPTIMIZE__ when -O2 or better
is used, so presumably that's the intent of the above and the reason
it doesn't work with Visual C++.

I'd ideally like my compiler to report the version of llvm it was
linked with (as well as its own version), so output of incorrect
information is a problem. Does anyone know of a solution to this?

Got it. You can define the relevant symbol at cmake stage, using a
command like this:

\cmake-2.8.0-win32-x86\bin\cmake.exe -DCMAKE_BUILD_TYPE=Release
"-DCMAKE_CXX_FLAGS_RELEASE=/MD /O2 /Ob2 /D NDEBUG /D __OPTIMIZE__"
c:\llvm-2.6

On Sun, Feb 14, 2010 at 5:41 AM, Russell Wallace
<russell.wallace at gmail.com> wrote:
> C:\llvm\bin>llc -version
> Low Level Virtual Machine (http://llvm.org/):
>  llvm version 2.6svn
>  DEBUG build.
>  Built Jan 31 2010(20:46:01).
>
>  Registered Targets:
>    x86    - 32-bit X86: Pentium-Pro and above
>    x86-64 - 64-bit X86: EM64T and AMD64
>
> I did specify the release build with cmake; the lack of crashing on
> exit of programs compiled therewith confirms that :-) As far as I can
> see, the reason for the incorrect reporting is in CommandLine.cpp:
>
> #ifndef __OPTIMIZE__
>        cout << "DEBUG build";
> #else
>        cout << "Optimized build";
> #endif
>
> According to a Google search, gcc sets __OPTIMIZE__ when -O2 or better
> is used, so presumably that's the intent of the above and the reason
> it doesn't work with Visual C++.
>
> I'd ideally like my compiler to report the version of llvm it was
> linked with (as well as its own version), so output of incorrect
> information is a problem. Does anyone know of a solution to this?
>

Russell Wallace <russell.wallace at gmail.com> writes:
> C:\llvm\bin>llc -version
> Low Level Virtual Machine (http://llvm.org/):
>   llvm version 2.6svn
>   DEBUG build.
>   Built Jan 31 2010(20:46:01).
>
>   Registered Targets:
>     x86    - 32-bit X86: Pentium-Pro and above
>     x86-64 - 64-bit X86: EM64T and AMD64
>
> I did specify the release build with cmake; the lack of crashing on
> exit of programs compiled therewith confirms that :-) As far as I can
> see, the reason for the incorrect reporting is in CommandLine.cpp:
>
> #ifndef __OPTIMIZE__
>         cout << "DEBUG build";
> #else
>         cout << "Optimized build";
> #endif
>
> According to a Google search, gcc sets __OPTIMIZE__ when -O2 or better
> is used, so presumably that's the intent of the above and the reason
> it doesn't work with Visual C++.
This doesn't seems right to me. A debug build is has debug symbols and
asserts enabled, while a release build has not. The activation of
optimizations doesn't imply a release build. A slightly better criteria
is the presence of NDEBUG, which is enabled by default on release builds
by configure and cmake, and has the advantage of being portable.

On Mon, Feb 15, 2010 at 11:57 AM, Óscar Fuentes <ofv at wanadoo.es>
wrote:
> This doesn't seems right to me. A debug build is has debug symbols and
> asserts enabled, while a release build has not. The activation of
> optimizations doesn't imply a release build. A slightly better criteria
> is the presence of NDEBUG, which is enabled by default on release builds
> by configure and cmake, and has the advantage of being portable.
Yeah, NDEBUG is the criterion I'm using for my own code. But the
existing code does use __OPTIMIZE__, so right now that does need to be
set to get the correct version display on the release build. It adds
an additional note as to whether NDEBUG was set.