CMake was not properly substituting the installation dir variables (they
ended up all empty), so the pkg-config results were also wrongs. For
instance cflags was: -I -I/json-c
Even though json-c was found at configure time, this obviously broke the
build of any application using it.

Now json-c can be bundled to any cmake-based project and used with
couple lines of code:

add_subdirectory(json-c EXCLUDE_FROM_ALL)
target_link_libraries(MyProject json-c)

This patch provides a CMakeLists.txt file to build JSON-C library without relying on auto-tools support. This makes the build a bit more portable and cleaner.

It can detect headers and symbols and generate config.h header file based on those detections. It cannot yet handle ctest(1) as the testing itself depends on comparing the output against files. Testing would need some creative abuse of CMake :) This will be provided a few patches later and may possibly involve refactoring test cases.

The patch has been tested on GCC 4.8.5 (Linux), GCC 7.2.0 (MinGW) and Microsoft Visual C++ 16.0 (2010?) locally. Also, compiles correctly on Travis CI and AppVeyor without errors.

Using 'project(foo VERSION 1.0)' requires CMake 3.0, the VERSION option
is not part of CMake 2.8.7, see:

* https://cmake.org/cmake/help/v2.8.7/cmake.html#command:project
* https://cmake.org/cmake/help/v3.0/release/3.0.0.html#commands

The property C_STANDARD was introduced with CMake 3.1, see:

* https://cmake.org/cmake/help/v3.1/release/3.1.0.html#properties

Signed-off-by: Alexander Dahl <post@lespocky.de>

Resolve windows name conflict

When building the project using cmake then installing it.  The
definitions in `json_object_iterator.h` are required but not installed
by the cmake install rule.  This patch adds the `json_object_iterator.h`
file to the list of files to install.

Signed-off-by: Keith Holman <keith.holman@windriver.com>

1. The windows dll will output the lib and dll, and rename the static
    lib will have conflict on windows.
2. Delete rename code to dismiss the conflict.

Also, add a few missing files to the list of sources to build.

want to merge the original repository

2.replace json_object_get/put API with json_object_retain/release, as they operate the reference counter, and confused with array_list_get/put_idx.
3.replace array_list_get/put_idx API with array_list_get/insert to make them more clear to use.

Fix CMake Build process improved for MinGW and MSYS2

Apply the same property as to json-c.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

This fix includes some fixes for config.h.win32 that was generating
some compiling errors on MinGW64 and also fix CMakeLists.txt in order to
give better support to MinGW and MSYS2

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

This reverts commit aaba8c1080.

This commit breaks builddir != srcdir build, but, more importantly, it
also adds a dependency on a header, "config.h", which is not installed
and it's supposed to be private — since it's generated at configuration
time and it's not meant to be used by projects compiling against a
library.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>