Re: Setting up a bare metal x86 toolchain

[ajxscc@gmail.com]

Hi Simon, thanks so much for taking the time to respond!
My host system is x86-64 Linux. So building a GCC cross-compiler isn't so difficult. From piecing together a few different answers I think I've answered some of my questions. It looks like I am able to build an x86 bare-metal executable using the native platform compiler. From what I understand, it appears that my assumption that compiling the equivalent of a 'freestanding' C executable in Ada is a matter of correctly configuring the RTS.
I actually already follow you on GitHub, and have already seen some of your example work on there, which has been a great resource! Thank you for having those resources there.

> but what I can't at once see how to do is to get gcc to pass the
arcitecture option on to the assembler.

From what I've seen FSF GNAT will accept the `-m32` switch, and it appears that AdaCore Gnat will also accept global configuration switches in the gprconfig as follows:
```
   package Builder is
      for Global_Compilation_Switches ("Ada") use ("-m32", "-march=i386");
      for Switches ("Ada") use ("-gnat2012", "-g", "-x", "-gnatg");
   end Builder;
```

Following the answer here: https://stackoverflow.com/questions/56721890/setting-up-a-bare-metal-x86-ada-toolchain I've been able to get a bare metal executable built using FSF GNAT. I'm still working on porting this over to the more modern AdaCore GNAT compiler.