cms-sw/cmssw — pull request #5371 by cmsbuild (2014-09-17 19:18:24+00:00)
Title: chrono: improvements to IFUNC and native timers

- check for GCC >= 4.6 (not only GLIBC >= 2.11.2) before using IFUNC
- implement native IFUNC-based timer
- implement fall-back mechanism when IFUNC is not available
- clean up native TSC timers
Automatically ported from CMSSW_7_2_X #5309