Thanks for sharing. I wish there was a similar article regarding the different quirks of Link-Time Optimization and its effect on debugging, and how that impact

Thanks for sharing. I wish there was a similar article regarding the different quirks of Link-Time Optimization and its effect on debugging, and how that impact has changed since GCC 4.x. Also, an explanation of how LTO's link-time optimization flags are chosen, and what happens when they're absent. And most importantly, why -O0 has an impact on LTO when it's passed at link-time, but eg. -O2/-O1 at compile time.