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[msvc] Add option for debugging symbols on release builds.

Authored by LazyDodo (LazyDodo) on Jul 26 2017, 5:12 PM.



Sometimes there's release mode bugs that are just hard to track down cause they don't happen in debug builds or can't be reproduced on a developer work station at all. This patch adds the option for including debugging symbols in release builds. The RelWithDebInfo configuration has shown to be unreliable (we tend to set debug/release c/cxx flags, but neglect RelWithDebinfo and MinSizeRel maybe we should remove these configurations all together on windows?)

This patch enables the following scenario's

  1. Easier debugging of release mode problems on developer workstations.
  2. allowing to ship an end users a build that will produce a crashdump with stack dump.

The option is controlled through the WITH_WINDOWS_RELEASE_DEBUG_SYMBOLS cmake option, and it's marked as advanced and off by default

The original patch i send @Sergey Sharybin (sergey) earlier today also included writing out a crashdump (akin to a coredump on linux) but I wasn't happy with how that was implemented, so i stripped that off, might bring it back at a later point in time if there's a need for it.

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