Re: Gnat-3.04 source; builtin_setjmp/builtin_longjmp

[dewar@cs.nyu.edu (Robert Dewar)]

David Mann wrote

   "Has anyone found that they cannot built GNAT-3.04 from source because
   the target platform does not support the routines 'builtin_setjmp'
   and 'builtin_lonjmp'.  If so, are they any ideas on what some
   replacement routines (in C I presume) would look like?"

You need to do the build as follows, no shortcuts will work:

1. Build a new version of the C compiler
2. Build a new version of libgcc
3. Build GNAT making *sure* that you use the new C compiler and libgcc
You won't have any trouble if you do that. Most remaining problems come
from people not really following step 3 (they accidentally use an old C
compiler or an old libgcc).

Symptoms of failing to follow the proper procedure include:

  1. Complaints about missing externals for builtin setjmp, longjmp
       (this means that you are not using the new C compiler)


  2. Complaints about missing external for __dummy
       (this means that you are not using the new libgcc)

  3. Blowup during compiling the library (typically at a-ncelfu)
       (this means you have built GNAT inconsistently, partly using
        the new stuff and partly the old).