It is possible to create a type-safe version of FlagRegisterer
ctor (as well as some internal gflags classes), that will deduce
type of the new flag automatically.

This results in removing quite a few calls to strcmp() when new
flag is created.

No existing behavior change.

Fix incorrect flag value typename for uint32.

Add missing reference symbol to a function parameter.

fix: Consider Windows-style LRLF in flag parsing

Fix bazel build

complain config.h can't be found.

Add GFLAGS_IS_A_DLL compile option for unit test which includes private config.h.

Support uint32 as flag type

From #99, “Given that there is an unsigned flag type for 64-bit
integers, it is probably reasonable to request/expect the same for
32-bit integers.”

fix #133: Use awk instead of sed which would require different options on OS X

mod: Update doc with new find_package COMPONENTS or subproject use

Fix build of unit test on Ubuntu/Windows by changing include order

These changes improve the CMakeLists.txt of the gflags project to make CMake variables configurable via command-line option -D or super-project settings. Moreover, gflags related variables are only added to the CMake cache when the gflags project is configured as a standalone project. When it is a subproject (cf. #117), the super-project is responsible for setting the configuration variables.

This change set also changes the names of the (exported) target names to gflags[_nothreads]_(static|shared) and the CMake (package) configuration variable names to start with an uppercase prefix "GFLAGS_".

find_package COMPONENTS

This change allows the user to include the gflags project as subtree/
submodule in their own project. In this case, no CMake variables used
to configure the build and installation of the gflags library should be
added to the CMake cache.

Fix compilation of unittest on Ubuntu

This reverts commit 02f31897.