[Buildroot] [git commit branch/2021.11.x] package/collectd: add missing comment for mysql dependencies

commit: https://git.buildroot.net/buildroot/commit/?id=2f517fae03e547d6c9e6c4fe373b17b61469afa1
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.11.x

Signed-off-by: Fabrice Fontaine <redacted>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit f877c668114c3dab465127a307b3268f1f34db5b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 package/collectd/Config.in | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/package/collectd/Config.in b/package/collectd/Config.in
index d44d4e4913..9c38d87bcb 100644
--- a/package/collectd/Config.in
+++ b/package/collectd/Config.in

@@ -384,6 +384,10 @@ config BR2_PACKAGE_COLLECTD_MYSQL
 	  Connects to a MySQL database and issues a "show status"
 	  command.
 
+comment "mysql needs a toolchain w/ C++, threads"
+	depends on BR2_USE_MMU
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS
+
 config BR2_PACKAGE_COLLECTD_NETLINK
 	bool "netlink"
 	select BR2_PACKAGE_LIBMNL

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