Internal compiler error with egcs 2.91.34 on a 1MB+ function

[Andreas Jaeger <aj at arthur dot rhein-neckar dot de>]

I configured glibc 2.0.94 on my system running egcs 2.91.34, Linux
2.1.104 with:
../libc/configure  --prefix=/usr/glibc/glibc-2.1 --disable-profile \
  --without-cvs --enable-add-ons --enable-omitfp

Compiling the file nss/nsswitch.c with the following command line:

/opt/egcs/bin/gcc nsswitch.c -c -O -Wall -Winline -Wno-parentheses
-Wstrict-prototypes -Wwrite-strings -g   -fPIC -g0			\
-fomit-frame-pointer -D__USE_STRING_INLINES				\
-I. -I/usr/glibc/src/build-2.1/nss -I.. -I../include -I../libio		\
-I/usr/glibc/src/build-2.1 -I../sysdeps/i386/elf			\
-I../crypt/sysdeps/unix -I../linuxthreads/sysdeps/unix/sysv/linux	\
-I../linuxthreads/sysdeps/pthread -I../linuxthreads/sysdeps/unix/sysv	\
-I../linuxthreads/sysdeps/unix -I../linuxthreads/sysdeps/i386		\
-I../linuxthreads/sysdeps/pthread/no-cmpxchg				\
-I../sysdeps/unix/sysv/linux/i386 -I../sysdeps/unix/sysv/linux		\
-I../sysdeps/gnu -I../sysdeps/unix/common -I../sysdeps/unix/mman	\
-I../sysdeps/unix/inet -I../sysdeps/unix/sysv/i386			\
-I../sysdeps/unix/sysv -I../sysdeps/unix/i386 -I../sysdeps/unix		\
-I../sysdeps/posix -I../sysdeps/i386/i486 -I../sysdeps/i386/fpu		\
-I../sysdeps/libm-i387 -I../sysdeps/i386 -I../sysdeps/wordsize-32	\
-I../sysdeps/ieee754 -I../sysdeps/libm-ieee754 -I../sysdeps/generic	\
-D_LIBC_REENTRANT -include ../include/libc-symbols.h  -DPIC   -o        \
/usr/glibc/src/build-2.1/nss/nsswitch.os 

gives an internal compiler error:
gcc: Internal compiler error: program cc1 got fatal signal 11

After generating the .i file with -save-temps and running cc1 on it, I 
got the following backtrace:
(gdb) r nsswitch.i -quiet -g0 -O99 -Wall -Winline -Wno-parentheses -Wstrict-prot
otypes -Wwrite-strings -version -fPIC -fomit-frame-pointer -o /tmp/ccZpQTKu.s
GNU C version egcs-2.91.34 19980605 (gcc2 ss-980502 experimental) (i486-pc-linux-gnu) compiled by GNU C version egcs-2.91.34 19980605 (gcc2 ss-980502 experimental).

Program received signal SIGSEGV, Segmentation fault.
init_alias_analysis () at ../../egcs-cvs/gcc/alias.c:1038
../../egcs-cvs/gcc/alias.c:1038: No such file or directory.
(gdb) bt
#0  init_alias_analysis () at ../../egcs-cvs/gcc/alias.c:1038
#1  0x814aa8d in schedule_insns (dump_file=0x0)
    at ../../egcs-cvs/gcc/sched.c:4321
#2  0x8069371 in rest_of_compilation (decl=0x83b2a58)
    at ../../egcs-cvs/gcc/toplev.c:3542
#3  0x80588da in finish_function (nested=0) at ../../egcs-cvs/gcc/c-decl.c:7124
#4  0x8049b97 in yyparse () at c-parse.y:348
#5  0x8067dae in compile_file (name=0xbffffb69 "nsswitch.i")
    at ../../egcs-cvs/gcc/toplev.c:2552
#6  0x806a682 in main (argc=15, argv=0xbffff9f4, envp=0xbffffa34)
    at ../../egcs-cvs/gcc/toplev.c:4398
#7  0x4002c432 in __libc_start_main (main=0x8069630 <main>, argc=15, 
    argv=0xbffff9f4, init=0x8048f10 <_init>, fini=0x8179f50 <_fini>, 
    rtld_fini=0x4000a720 <_dl_fini>) at ../sysdeps/generic/libc-start.c:74

The problem seems to be the function nss_lookup_function which has
expanded a size of a bit over 1 MB.  Using -O0 instead of -O99 on the
.c file generates a much smaller .i file (154k instead of 1.3M) since
no functions are inlined - and succeeds.

I don't think it's wise to mail the whole 1.3M .i-file to egcs-bugs.
If anybody likes to look into this, please tell me and I can send you
the file directly.  Since the compiler error happens with this large
function (I removed it and egcs compiled the file fine) I don't see
much chance to make the file much shorter:-(.

Andreas
-- 
 Andreas Jaeger   aj@arthur.rhein-neckar.de    jaeger@informatik.uni-kl.de
  for pgp-key finger ajaeger@alma.student.uni-kl.de