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configure: Detect kcov support and introduce CONFIG_KCOV
kcov is kernel code coverage tracing tool. It requires kernel 4.4+ compiled with certain kernel options. This patch checks if kcov header "sys/kcov.h" is present on build machine, and stores the result in variable CONFIG_KCOV, meant to be used in linux-user code related to the support for three ioctls that were introduced at the same time as the mentioned header (their definition was a part of the first version of that header). Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <1579214991-19602-11-git-send-email-aleksandar.markovic@rt-rk.com> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
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