[Bug ada/48835] Porting GNAT to GNU/Linux/m68k

[mikpe at it dot uu.se]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48835

--- Comment #42 from Mikael Pettersson <mikpe at it dot uu.se> 2011-12-07 09:58:17 UTC ---
(In reply to comment #41)
> I'll continue to bisect and test with r162897 reverted.

With r162897 reverted subsequent gcc-4.6 snapshots up to the 4.6.2 release
bootstrap fine with Ada enabled and a few patches applied, specifically:
1. revert the core of r162897 (original has a few harmless failing hunks)
2. backport of pr43804 fix
3. backport of pr47612 fix which also fixes pr48554
4. the m68k-ada patch as posted here earlier
5. backport r178834 cfgcleanup HAVE_cc0 fix (will also be in 4.6.3)

Note I'm not applying the insv fragment of r171341 any more.  I saw some test
suite regressions from 4.6 with it applied so I've dropped it.

However, meanwhile 4.7 has broken.  4.7-20110730 builds fine as a cross, but
every snapshot from 20110806 to 20111203 ICE as follows:

/tmp/objdir/./gcc/xgcc -B/tmp/objdir/./gcc/
-B/home/mikpe/pkgs/linux-x86/cross-m68k/m68k-unknown-linux/bin/
-B/home/mikpe/pkgs/linux-x86/cross-m68k/m68k-unknown-linux/lib/ -isystem
/home/mikpe/pkgs/linux-x86/cross-m68k/m68k-unknown-linux/include -isystem
/home/mikpe/pkgs/linux-x86/cross-m68k/m68k-unknown-linux/sys-include    -c -g
-O2   -W -Wall -gnatpg -nostdinc   a-assert.adb -o a-assert.o
+===========================GNAT BUG DETECTED==============================+
| 4.7.0 20111203 (experimental) (m68k-unknown-linux) GCC error:            |
| in fp_size_to_prec, at ada/gcc-interface/misc.c:781                      |
| Error detected around <built-in>:0                                       |

So now I'm bisecting trunk to identify the cause of this regression.