[Bug bootstrap/49072] Error building the compiler

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49072

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-05-19 22:30:41 UTC ---
(In reply to comment #0)
> I downloaded from one of the mirror sites the following tar balls:
> 
> gcc-4.6.0.tar.gz
> gmp-4.3.2.tar.bz2
> mpc-0.8.1.tar.gz
> mpfr-2.4.2.tar.bz2
> 
> I decompressed and untarred the files, which resulted in four directories,
> respectively: gcc-4.6.0, gmp-4.3.2, mpc-0.8.1, and mpfr-2.4.2. I then created
> the directory ~/gcc4 and I moved gcc-4.6.0 in it. I then changed the names of
> the directories gmp-4.3.2, mpc-0.8.1, and mpfr-2.4.2 to gmp, mpc, and mpfr,
> respectively. These three directories, namely gmp, mpc, and mpfr were moved it
> to ~/gcc4/gcc-4.6.0. In gcc4, I created the directory objdir. So, the directory
> tree looks like the following:
> 
> |--gcc4
> |  |--objdir
> |  |--gcc-4.6.0
> |  |  |--gmp
> |  |  |--mpc
> |  |  |--mpfr
> 
> I then proceeded to configure the installation. From ~/gcc4/objdir, I executed
> “../gcc-4.6.0/configure”.

This is all ok so far, which puts you well ahead of almost all people who
report problems building gcc!

> Once the Makefile was created, still from within ~/gcc4/objdir, I executed
> “make bootstrap”.

Just "make" is all you need, "make bootstrap" hasn't been needed for some time
now.


> After about 24 hours of execution, the build failed with the
> following error message:
> 
> ../../../gcc-4.6.0/libgcc/../gcc/libgcc2.c:791:1: internal compiler error:
> Floating point exception
> Please submit a full bug report,
> With preprocessed source if appropriate.
> See http://gcc.gnu.org/bugs.html for instructinos.
> make [3]: *** [_popcountsi2.o] Error 1
> make [3]: Leaving directory
> ‘/home/Jose.Pascual-Gutierr/gcc4/objdir/i686-pc-cygwin/libgcc’
> make [2]: *** [all-stage2-target-libgcc] Error 2
> make [2]: Leaving directory ‘/home/Jose.Pascual-Gutierr/gcc4/objdir’
> make [1]: *** [stage2-bubble] Error 2
> make [1]: Leaving directory ‘/home/Jose.Pascual-Gutierr/gcc4/objdir’
> make: *** [bootstrap] Error 2

What if you type "make" again?  Does it fail at the same place?

It might not be relevant, but although it's the minimum required version, MPFR
2.4.2 is a bit old now.  I suspect most people building GCC 4.6 are using a
newer version of MPFR.  Does it help if you repeat the whole process using MPFR
3.0.1 instead?