Add compile/link flags to force debug symbols even for Release builds. #125
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When compiling a CMake release build, CMake doesn't invoke the compiler / linker with flags needed to preserve debugging information. There is a
RelWithDebInfotarget which does set these flags, but it sets the optimization a bit lower thanReleaseto favor better debugging over performance optimizations. This change forces the flags to be enabled in all builds (evenRelease), while keeping all release optimizations enabled. (Note: this can mean the debugging information isn't completely accurate or has some missing information due to compiler optimizations; but it will be enough to decode the stack frames withgdborwindbgto see the function names.)This change also enables link-time code generation (LTCG) / interprocedural optimization (IPO) when supported by the compiler.