Make libartnet 99% CMake compatible

[enwi]

I added a CMakeLists.txt and edited the config.h.in accordingly. It works fine on my MacBook running MacOS Sonoma (M1). A few things still need to be fixed:

• GNU libc compatible malloc -> HAVE_MALLOC
• GNU libc compatible realloc -> HAVE_REALLOC
• C99 stdbool.h -> HAVE_STDBOOL_H
• Check for _Bool type -> HAVE__BOOL
• Name of package -> PACKAGE
• Bug report address -> PACKAGE_BUGREPORT
• Full name of package -> PACKAGE_NAME
• Full name and version of package -> PACKAGE_STRING
• Symbol short name -> PACKAGE_TARNAME
• Version -> PACKAGE_VERSION
• Type of arg 1 of select -> SELECT_TYPE_ARG1
• Type of arg 2,3 & 4 of select -> SELECT_TYPE_ARG234
• Type of arg 5 of select -> SELECT_TYPE_ARG5
• Ansi C header files -> STDC_HEADERS
• Safely include both <sys/time.h> and <time.h> -> TIME_WITH_SYS_TIME
• Version number -> VERSION
• const does not conform to ANSI C -> const
• rpl_malloc if the replacement function should be used -> malloc
• rpl_realloc if the replacement function should be used -> realloc
• unsigned int if <sys/types.h> does not define -> size_t

[nomis52]

It's been a while since I've thought about autoconf & build tools, but f this is now generating config.h.in from CMakeLists.txt, does that mean that configure.ac is now redundant?

[enwi]

In theory you won't need to use configure anymore, unless you want to still be able to use the old build system. Therefore there are two options.

1. Remove all of the old build system and only keep CMake
2. Keep both build systems to be backwards compatible

For option two I would recommend renaming the config.h.in to something else for CMake as it currently breaks the configure command

[nomis52]

Let's go for option 2)

[enwi]

Then I will change a few things

[enwi]

@nomis52 I have updated the PR

[nomis52]

Thanks, do you mind adding to the README explaining how to build with cmake

Rest of it looks good.

[enwi]

Sure, I can do that. What about the open points? Not all flags/defines are set correctly

[MarcoHess]

We were trying to use this project with CMake and found that we needed to add an include directory reference to the artnet subdirectory in the CMakeList.txt to get our project to compile correctly:

# Include directories
target_include_directories(libartnet PUBLIC ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/artnet)