Enhancing asn1c interfaces for building with other build systems

[rcoscali]

Hi Lev

I found your asn1c compiler very usefull. I work at Renault as a Cybersecurity Architect and I'm designing an In-Vehicule EDR. For this I need to generate some monitoring data from Linux Kernel and providing it to an inference engine (deep learning). This data is a Provenance graph. For generating it inside the kernel I need then to serialize/deserialize.
For this I have to build the asn1c generated code inside

1. cmake for the serialization/deserialization tests
2. Linux build system (Kconfig + Linux Makefile)

So I'am adding a cmake interface and a Linux build system interface with your compiler. At now I'm using
-GMakefile
-Gcmake
-Glxmake
for selecting the build interface wanted. I'm also adding the doc snippet for all this.
At now it is a work in progress.
I did fork your repo in github for this at https://github.com/rcoscali/asn1c and I will propose PR when it will be stable.
Do not hesitate to comment if you think it is necessary.

Thanks for your work

Best

Rémi

[rcoscali]

I also plan to modify all dynamic allocations for encoder/decoders for them to be able to run inside Linux kernel (using kmalloc instead of malloc, etc). For this I will modify generated code for adding a cpp encapsulation that will modify all alloc/free for anyone to use it (for example using alloca or a specific allocator in an embedded RTOS).
All these shall be available through specific code generator options (if needed).
I think I'll be able to provide a full PR at start of next year (in a few weeks).
Edit1: Just saw it is already correctly encapsulated by CPP ... will be easy.

[rcoscali]

For the documentation of the build system interface I propose to remove all Makefile or Makefile.am related comments and move them in a dedicated "build system interface" section of the "Using ASN1C compiler" chapter ... If this suits U.
I'll add the doc for using the cmake related interface (with all cmake related tricks to use). cmake will be a great help for using windows based build systems (even if I do not use it, perhaps someone can document it).
The same for the linux build system (not designed yet) on linux and WSL (I use both).