/* I'm using cmake-3.2.20150331-gb190c. */
I have a following construction:
ExternalProject_Add(
websockets_ep
DEPENDS ev openssl
...)
But it so happened, that "openssl" is a INTERFACE library. Because of
that I get an obscure error:
CMake Error at
/usr/share/cmake/share/cmake-3.2/Modules/ExternalProject.cmake:2031
(get_property):
INTERFACE_LIBRARY targets may only have whitelisted properties. The
property "_EP_IS_EXTERNAL_PROJECT" is not allowed.
Call Stack (most recent call first):
/usr/share/cmake/share/cmake-3.2/Modules/ExternalProject.cmake:2328
(_ep_add_configure_command)
src/libwebsockets/CMakeLists.txt:21 (ExternalProject_Add)
Apparently because there is a check inside get_property() that
whitelists what properties could be queried.
Maybe we don't need a whitelist for get_property()? :)
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