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Subject: Re: gcc-4.7.X and native Ada compiler for DJGPP
Date: Sat, 16 Jun 2012 17:48:37 -0700 (PDT)
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Hi,

On Saturday, June 16, 2012 5:18:59 AM UTC-5, Andris Pavenis wrote:
>
> I'm getting the following when trying to bootstrap gcc-4.7.1 for DJGPP 
> with Ada compiler enabled:
> 
> error: "system.ads" has restriction No_Implicit_Dynamic_Code
> error: but the following files violate this restriction:
> error:   "make.adb"
> error:   "makeutl.adb"
> error:   "prj.adb"
> error:   "prj-env.adb"
> error:   "prj-conf.adb"
> error:   "prj-nmsc.adb"
> make.exe[3]: *** [b_gnatm.adb] Error 5
> make.exe[3]: Leaving directory `g:/build.gcc/gcc/ada/tools'
> make.exe[2]: *** [gnattools-native] Error 2
> make.exe[2]: Leaving directory `g:/build.gcc/gnattools'
> make.exe[1]: *** [all-gnattools] Error 2
> make.exe[1]: Leaving directory `g:/build.gcc'
> make.exe: *** [bootstrap] Error 2
> 
> Do anybody know how to fix that? I do not know Ada well enough for that 
> (or more exactly my knowledge about Ada language is close to 
> non-existent). I had the same problem also with gcc-4.7.0. This was the 
> reason why DJGPP port of Ada compiler was left out for GCC-4.7.0.

I don't know Ada either. A quick Google search shows this:

http://gcc.gnu.org/onlinedocs/gnat_rm/No_005fImplicit_005fDynamic_005fCode.html

They seem to want to (mostly) avoid "trampolines" that require executable stack code because DEP under Windows doesn't like that. (Though I doubt DOS has the same concerns.)

Anyways, a comparison of system.ads from GCC 4.1.2 and 4.6.3 shows that the former didn't have such a pragma enabled at all. I would be surprised if just removing that magically fixed it, but you could try it!

"
pragma Restrictions (No_Implicit_Dynamic_Code);
--  We want to avoid trampolines in the compiler, so it can be used in systems
--  which prevent execution of code on the stack, e.g. in windows environments
--  with DEP (Data Execution Protection) enabled.
"