[Bug ada/48835] porting GNAT to m68k-linux

[mikpe at it dot uu.se]

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

--- Comment #54 from Mikael Pettersson <mikpe at it dot uu.se> 2013-03-20 11:05:58 UTC ---
Status update:

Although gnat is solid enough to rebuild itself with (patched) gcc-4.6 on m68k,
there is a regression with (similarly patched) 4.7 that breaks bootstrap:

/mnt/scratch/objdir47/./gcc/xgcc -B/mnt/scratch/objdir47/./gcc/
-B/usr/m68k-brewer-linux/bin/ -B/usr/m68k-brewer-linux/lib/ -isystem
/usr/m68k-brewer-linux/include -isystem /usr/m68k-brewer-linux/sys-include   
-c -g -O2 -mcpu=68060 -fpic  -W -Wall -gnatpg -nostdinc -mcpu=68060 
a-calfor.adb -o a-calfor.o
xgcc: internal compiler error: Segmentation fault (program gnat1)
Please submit a full bug report,
with preprocessed source if appropriate.
make[9]: *** [a-calfor.o] Error 4
make[9]: Leaving directory `/mnt/scratch/objdir47/gcc/ada/rts_m68060'
make[8]: *** [gnatlib] Error 2
make[8]: Leaving directory `/mnt/scratch/objdir47/gcc/ada'
make[7]: *** [gnatlib-shared-default] Error 2
make[7]: Leaving directory `/mnt/scratch/objdir47/gcc/ada'
make[6]: *** [gnatlib-shared-dual] Error 2
make[6]: Leaving directory `/mnt/scratch/objdir47/gcc/ada'
make[5]: *** [gnatlib-shared] Error 2
make[5]: Leaving directory `/mnt/scratch/objdir47/gcc/ada'
make[4]: *** [gnatlib-shared] Error 2
make[4]: Leaving directory
`/mnt/scratch/objdir47/m68k-brewer-linux/m68060/libada'
make[3]: *** [multi-do] Error 1
make[3]: Leaving directory `/mnt/scratch/objdir47/m68k-brewer-linux/libada'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/mnt/scratch/objdir47/m68k-brewer-linux/libada'
make[1]: *** [all-target-libada] Error 2
make[1]: Leaving directory `/mnt/scratch/objdir47'
make: *** [bootstrap] Error 2

This only occurs when compiling the 68060 variant of the libraries.  With
multilibs disabled 4.7.3 bootstraps fine w/ Ada.

This ICE started with r180192, an ICE fix (PR50780).  I don't see anything in
that patch that seems m68k or cc0 related, so I suspect it just exposed some
latent issue.