Created attachment 7981 [details]
cmake error log

I can confirm a build failure, but the error is in fact from this (I think):

CMake Error at cmake/os/Linux.cmake:29 (STRING):
STRING sub-command REPLACE requires at least four arguments.
Call Stack (most recent call first):
CMakeLists.txt:101 (INCLUDE)

CMake Error at cmake/os/Linux.cmake:29 (STRING):
STRING sub-command REPLACE requires at least four arguments.
Call Stack (most recent call first):
CMakeLists.txt:101 (INCLUDE)


Note that mariadb doesn't get built in the autobuilders because it comes from a choice.

I get a build failure related to a missing host openssl package.  The following patch [1] fixes it for me.  Note that this was marked superseded.

[1] http://patchwork.ozlabs.org/patch/1026864/

Can reproduce the failure Arnout describes (on buildroot master), fixed by:

diff -u build/mariadb-10.3.16/cmake/os/Linux.cmake.orig build/mariadb-10.3.16/cmake/os/Linux.cmake
--- build/mariadb-10.3.16/cmake/os/Linux.cmake.orig	2019-08-15 21:36:25.032673425 +0200
+++ build/mariadb-10.3.16/cmake/os/Linux.cmake	2019-08-15 21:36:54.065106056 +0200
@@ -27,8 +27,8 @@
 # Fix CMake (< 2.8) flags. -rdynamic exports too many symbols.
 FOREACH(LANG C CXX)
   STRING(REPLACE "-rdynamic" "" 
-  CMAKE_SHARED_LIBRARY_LINK_${LANG}_FLAGS
-  ${CMAKE_SHARED_LIBRARY_LINK_${LANG}_FLAGS}  
+  "CMAKE_SHARED_LIBRARY_LINK_${LANG}_FLAGS"
+  "${CMAKE_SHARED_LIBRARY_LINK_${LANG}_FLAGS}"
   )
 ENDFOREACH()

Disclaimer: no cmake expert, just a quick fix/hack, not sure if the patch makes sense ;-), but fixes the configure error...

@Alexey: Your failure is with buildroot-2018.11.4, feel free to try the patch, in case of failure please provide a complete config/defconfig file to reproduce and a complete log of the mariadb build steps (your provided log is only about the cmake checks, no real failure)...

Fixed by c2ff8c63dab10d2c1adca7229101b5468dac562b