Hello
When building the gcc trunk revision 156557 on Ubuntu lucid AMD64 (the alpha of the next Ubuntu release, which I
upgraded just today on Febr 06, 2010), I am getting a repeatable SIGSEGV from genmodes
apparently, eq_mode is getting p=q=null pointers.
The compiler compiling GCC trunk with CFLAGS='-O -g' is
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.4.3-2ubuntu1'
--with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
--enable-shared --enable-multiarch --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4
--enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --disable-werror --with-arch-32=i486
--with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.4.3 (Ubuntu 4.4.3-2ubuntu1)
THe GCC trunk 156557 was configured with
CFLAGS='-O -g' ../gcc-trunk/configure --disable-bootstrap --enable-lto
--enable-languages=c,lto
The debug backtrace is
(gdb) bt
#0 0x00000000004082a0 in strcmp ()
#1 0x0000000000400d22 in eq_mode (p=<value optimized out>,
q=<value optimized out>) at ../../gcc-trunk/gcc/genmodes.c:199
#2 0x0000000000403a96 in htab_find_with_hash (htab=0x409010,
element=0x7fffffffe180, hash=4294965254)
at ../../../gcc-trunk/libiberty/hashtab.c:575
#3 0x0000000000403b44 in htab_find (htab=0x409010, element=0x7fffffffe180)
at ../../../gcc-trunk/libiberty/hashtab.c:599
#4 0x0000000000401150 in find_mode (cl=MODE_FRACT, name=0x404eeb "SQ",
file=0x6 <Address 0x6 out of bounds>, line=6)
at ../../gcc-trunk/gcc/genmodes.c:149
#5 new_mode (cl=MODE_FRACT, name=0x404eeb "SQ",
file=0x6 <Address 0x6 out of bounds>, line=6)
at ../../gcc-trunk/gcc/genmodes.c:159
#6 0x00000000004012cc in make_fixed_point_mode (cl=4213776,
name=0x404eeb "SQ", bytesize=4, ibit=0, fbit=31,
file=0x405370 "../../gcc-trunk/gcc/machmode.def", line=206)
at ../../gcc-trunk/gcc/genmodes.c:578
#7 0x0000000000401ed6 in create_modes ()
at ../../gcc-trunk/gcc/machmode.def:206
#8 0x000000000040262a in main (argc=<value optimized out>,
argv=<value optimized out>) at ../../gcc-trunk/gcc/genmodes.c:1395
I am not able to reproduce that bug on my desktop running Debian/Sid. Both are
AMD64 architectures.
Does anyone observed that also? It seems Ubuntu/Lucid specific ... (kernel is 2.6.32-12-generic from ubuntu if that
matters; libc6 package is 2.11.1-0ubuntu2 from ubuntu).
Regards.
--
Basile STARYNKEVITCH http://starynkevitch.net/Basile/
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