------- Additional Comments From ro at techfak dot uni-bielefeld dot de
2005-06-09 23:09 -------
Subject: Re: [4.0/4.1 Regression] Cannot build gnattools on Tru64 UNIX V5.1B
I've done some further debugging and found what's going on: running the
failing gnatmake invokation
% ../../gnatmake -c -I../rts -I. -I/vol/gnu/src/gcc/gcc-dist/gcc/ada gnatchop
--GCC="../../xgcc -B../../ -O2 -g -O2 -mieee -gnatpg -gnata"
gnatmake: "gnatchop" not found
under truss reveals that with gnatmake from the 3.4 branch, there are
several calls to stat() for gnatchop.adb in different directories. With
the 4.0 gnatmake, the stat() calls only look for gnatchop (which of course
doesn't exist yet). Those calls ultimately come from Osint.Next_Main_File.
Running gnatmake under a debugger, I find that in 4.0, neither the case
Running_Program is entered nor the
if Running_Program = Make then
block that does the adding of .adb and .ads. It turns out that
Osint.Running_Program = 4 at that point (debugging seems considerably
broken on 4.0: with the 3.4 binaries and current CVS gdb, I get symbolic
values here, while the 4.0 binaries only give numeric ones), i.e. Unspecified.
Running gnatmake again under gdb with a watchpoint on
Osint.Running_Program, I find that
* for the 3.4 binary, the variable is set only once via Osint.Set_Program (to
Osint.Make, as expected) and never touched afterwards, whereas
* for the 4.0 binary, the variable is set once in the same place, and later
overwritten in osint___elabb (obviously the Osint initialization code),
where it is set to 4 (Unspecified) as observed above.
So maybe this is an Ada bug after all, not really target specific.
Rainer
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18434
