[CMake] Force MSVC runtime for debug builds

[Kim Kryger]

Issue created:
https://gitlab.kitware.com/cmake/cmake/issues/16430

On Tue, Nov 15, 2016 at 3:47 AM, Mueller-Roemer, Johannes Sebastian <
Johannes.Sebastian.Mueller-Roemer at igd.fraunhofer.de> wrote:

> I agree that CMake should not be defining _DEBUG explicitly, as it is used
> by Microsoft’s headers to match the chosen runtime.
>
> Maybe this warrants a bug report on gitlab.
>
>
>
> *From:* CMake [mailto:cmake-bounces at cmake.org] *On Behalf Of *Kim Kryger
> *Sent:* Monday, November 14, 2016 22:05
> *To:* Stephan Menzel <stephan.menzel at gmail.com>
> *Cc:* cmake <cmake at cmake.org>
> *Subject:* Re: [CMake] Force MSVC runtime for debug builds
>
>
>
> I ran into this today. I tried to use /MD to link against a custom md
> library, but because _DEBUG was defined *by CMake* I couldn't use it out of
> the box.
>
>
>
> Why is CMake defining _DEBUG for MSVC projects anyways? _DEBUG is
> automatically defined when using /MDd, and I don't believe it should be
> defining it itself. I've had to remove it for multiple projects because
> it's making assumptions as to what I want defined.
>
>
>
>
>
> Default for CMAKE_CXX_FLAGS_DEBUG_INIT
>
> /D_DEBUG /MDd /Zi /Ob0 /Od /RTC1
>
>
>
> I don't think that first define should be there.
>
>
>
>
>
> Reference:
>
> https://github.com/Kitware/CMake/blob/5d29506811c5b75ae48e12de6c317f
> 6440874215/Modules/Platform/Windows-MSVC.cmake#L294
>
> https://msdn.microsoft.com/en-us/library/0b98s6w8.aspx
>
>
>
>
>
> On Fri, Nov 11, 2016 at 9:42 AM, Stephan Menzel <stephan.menzel at gmail.com>
> wrote:
>
>
>
> On Tue, Nov 8, 2016 at 4:21 PM, <clinton at elemtech.com> wrote:
>
> If you are going to use /MD instead of /MDd, then you probably also need
> to remove the _DEBUG preprocessor flag.
>
> IIRC, I've seen cases where defining _DEBUG includes symbols only
> defined by the debug runtimes.
>
>
>
> Clint
>
>
>
> What a surprise. Removing _DEBUG did the trick. I was under the impression
> _DEBUG only controls Microsoft STL impl's debug iterator stuff but
> apparently it also makes the resulting exe link with /MD rather than /MDd.
> Guess that was wrong.
>
>
>
> So yes, problem solved.
>
>
>
> Thank you!
>
>
>
> Stephan
>
>
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