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[PULL 08/17] configure: Detect kcov support and introduce CONFIG_KCOV

From: Laurent Vivier
Subject: [PULL 08/17] configure: Detect kcov support and introduce CONFIG_KCOV
Date: Thu, 23 Jan 2020 09:22:18 +0100

From: Aleksandar Markovic <address@hidden>

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 <address@hidden>
Reviewed-by: Laurent Vivier <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Laurent Vivier <address@hidden>
 configure | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/configure b/configure
index 557e4382ea87..d91eab4d65c4 100755
--- a/configure
+++ b/configure
@@ -4761,6 +4761,12 @@ if compile_prog "" "" ; then
+# check for kcov support (kernel must be 4.4+, compiled with certain options)
+if check_include sys/kcov.h ; then
+    kcov=yes
 # Check we have a new enough version of sphinx-build
 has_sphinx_build() {
     # This is a bit awkward but works: create a trivial document and
@@ -6874,6 +6880,9 @@ fi
 if test "$syncfs" = "yes" ; then
   echo "CONFIG_SYNCFS=y" >> $config_host_mak
+if test "$kcov" = "yes" ; then
+  echo "CONFIG_KCOV=y" >> $config_host_mak
 if test "$inotify" = "yes" ; then
   echo "CONFIG_INOTIFY=y" >> $config_host_mak

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