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Newsgroups: comp.lang.ada
Date: Tue, 25 Jun 2019 02:43:03 -0700 (PDT)
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Subject: Re: Setting up a bare metal x86 toolchain
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Xref: reader01.eternal-september.org comp.lang.ada:56754
Date: 2019-06-25T02:43:03-07:00
List-Id: <comp.lang.ada>

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 d=
ifficult. From piecing together a few different answers I think I've answer=
ed 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 havi=
ng 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 gpr=
config as follows:
```
   package Builder is
      for Global_Compilation_Switches ("Ada") use ("-m32", "-march=3Di386")=
;
      for Switches ("Ada") use ("-gnat2012", "-g", "-x", "-gnatg");
   end Builder;
```

Following the answer here: https://stackoverflow.com/questions/56721890/set=
ting-up-a-bare-metal-x86-ada-toolchain I've been able to get a bare metal e=
xecutable built using FSF GNAT. I'm still working on porting this over to t=
he more modern AdaCore GNAT compiler.