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ARMv7 requires special kernel settings to allow cycle counters to be read. This change adds a cmake setting to enable/disable counters. On all architectures but ARMv7 it is enabled by default, and on ARMv7 we run a small test program to see if the can be executed successfully. When cross-compiling to ARMv7 counters will be disabled, but either choice can be overridden by setting a value for GMX_CYCLECOUNTERS in cmake. Fixes #1933. Change-Id: I1e217d7a09f84a6bcf4eb5bf4a656d430465c915
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