* remove biicode support
The company/startup died in 2015 and the open source project seems
to be dead as well.
* define compiler warning flags globally instead of locally for every binary
* add support for cmake's find_package() (refs #52)
This rewrite of the main CMakeLists.txt cleans up the way ICU flags
are attached to the library target and adds the cmake helper files
(cxxopts-config.cmake, cxxopts-config-version.cmake,
cxxopts-targets.cmake) which are needed for exporting the cxxopts
target. Cmake's find_package command uses these files when the
library is consumed by another project.
Additionally, two new tests have been added which build the example
application via add_subdirectory and find_package.
* removed target_sources from interface library
Adding target_sources to interface libraries and exporting them is
not supported in CMake 3.1 and 3.2. Furthermore, since it is a header,
it is not needed at all.
* use the *_LDFLAGS instead of *_LIBARIES when linking ICU
The LIBRARIES variable seems to contain only the name and not the
full path.
Fixes#33.
This PR uses cmake's interface library feature:
An INTERFACE library target does not directly create build output,
though it may have properties set on it and it may be installed,
exported and imported.
This makes it easier to include the header only library in a cmake
project. After using add_subdirectory on the cxxopts directory, one
simply needs to include cxxopts in their target_link_libraries, which
will allow the user's target to inherit the properties of the cxxopts
header library (see changes to example and test).
* Add cxxopts.hpp as a source file to executable
* Add msvc options for compiling
* Add CXXOPTS_BUILD_EXAMPLES option to CMake build
* This is helpful when using CMake's ExternalProject_add()
* It is ON by default, but configurable from the command-line.
