ATDM: Add a release-debug build that adds debug symbols

[bartlettroscoe]

It was required in #6022 that the release-debug keyword in that ATDM Trilinos build name set CMAKE_BULD_TYPE=RELWITHDEBINFO instead of CMAKE_BULD_TYPE=RELEASE so that -g will get set. his will increase the size of the executables (perhaps but a lot) with the addition of -g but no more than a pure debug build which sets CMAKE_BUILD_TYPE=DEBUG. And you need debug symbol info to make the runtime error messages generated from the runtime error checks enabled by Trilinos_ENABLE_DEBUG=ON to be more useful (like in stack traces).

[bartlettroscoe]

@jhux2,

After some more thought, given that this change will make release-debug will increase the binary size a lot over just release, it might be better to introduce the new keywords relwithdebinfo and relwithdebinfo-debug and have them define CMAKE_BULD_TYPE=RELWITHDEBINFO. Otherwise, in order to turn on some runtime checks, we force users to create much larger binaries with release-debug.

We can't support all of the possible tweaks to a Trilinos configuration in just a few build-name keywords and users can always override any cache vars they want (like you did by passing in -DCMAKE_BUILD_TYPE=RELWITHDEBINFO). But the options we chose should be "Least surprise" to the largest number of users.

I think we may need to poll a few people and see what they think about this.

[bartlettroscoe]

Actually, I think I might just do this by adding a new build-name keyword dbginfo that if included in the buildname will set the CMake cache var Trilinos_ENABLE_DEBUG_SYMBOLS=ON.

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