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In my SConstruct I have ```default_variants = ['dbg',],``` but this seems to be ignored when I build with ```scons --test``` normal build, it works OK and builds just the dbg...

(Minor documentation issue) The ["Sample sconscript file"](https://github.com/ja11sop/cuppa#sample-sconscript-file) in the README.md doesn't work, it gives an error like this in any build with more than one variant: ``` cuppa: __init__: [error]...

I'm trying to pass some data to my test, like this ``` env.BuildTest('my_test', 'my_test.cpp', data = 'testData.txt') ``` I was expecting the test program to be executed with the testData.txt...

Just a minor issue: a couple of compiler warnings are generated env.CreateVersion(): build/src/gcc62/dbg/x86_64/c++1z/working/src/version.cpp: In function 'build::identity::dependencies_t build::initialise_dependencies()': = Warning 1 = _build/src/gcc62/dbg/x86_64/c++1z/working/src/version.cpp:65:38: warning: typedef 'dependency_t' locally defined but not used...

docker/gen_uml.sh fails if directory name starts with "proto"

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Hi, If proto location is directory starting with "proto" then the gen_uml.sh fails to rename the file Example ``` |-- foo.proto `-- lib `-- protobuf `-- bar.proto ``` and foo.proto...