cmake ExternalProject cache overwritten -

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hello i'm facing problem regarding cmake , external projects.

i set compiler , flags via cmake_cache_args and/or cmake_args works first time run make on subsequent call cmake cache of external project rebuild (deleted) , flags not set accordingly flags specified! wonder there workaround/way specify compiler once prevent rebuilding of cache?

following basic test project downloads , compiles gtest, first call make compiles clang++ , given flags, following call make cause cmake cache rebuild without proper flags being set!

cmake_minimum_version_required(version 2.8.6) project(test)  include(externalproject) externalproject_add(     gtest     svn_repository http://googletest.googlecode.com/svn/tags/release-1.7.0/     cmake_args     -dcmake_cxx_compiler:string=clang++     -dcmake_cxx_flags:string="\"-std=c++1y -stdlib=libc++\""     install_command "" # 1 can not install gtest dont here     log_download 1     log_update 1     log_configure 1     log_build 1     )


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