http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53662
Bug #: 53662
Summary: Cannot build static gcc on i686 linux gnu with -m64
support.
Classification: Unclassified
Product: gcc
Version: 4.6.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: kre...@email.com
Hello there. I am not sure if something is wrong with my setup, but I am unable
to build gcc multilib compiler.
I have pure 32bit system built from scratch (Linux From Scratch), but I would
like to have multilib compiler so I can compile 64bit kernel in 32bit userland
(not cross-compile).
Long story short, I am unable to bootstrap gcc to support -m64.
~/src/build/prev-gcc$ ./xgcc -v
Using built-in specs.
COLLECT_GCC=./xgcc
Target: i686-pc-linux-gnu
Configured with: ../src/configure --prefix=/usr/gcc --libdir=/usr/gcc/lib
--libexecdir=/usr/gcc/lib --without-headers --with-newlib --disable-shared
--disable-nls --disable-decimal-float --disable-libgomp --disable-libmudflap
--disable-libquadmath --disable-libssp --disable-threads --without-ppl
--without-cloog --enable-targets=i686-pc-linux-gnu,x86_64-unknown-linux-gnu
--with-mpfr-include=/home/armin/src/src/mpfr/src
--with-mpfr-lib=/home/armin/src/build/mpfr/.libs --enable-multilib
--with-multilib-list=m32,m64,mx32 --enable-bootstrap --enable-languages=c
Thread model: single
gcc version 4.6.3 (GCC)
~/src/build/prev-gcc$ ./cc1 --help
...
-m32 [enabled]
-m3dnow [disabled]
-m64 [disabled]
...
These are from stage2 and remain same after stage3, even when installed. It
just says "Sorry, 64bit mode not implemented" or whatever when I try to compile
something with gcc -m64.
I have built binutils with --enable-multilib support already, so I am not
really sure what I've done wrong. Shared gcc libraries require 64bit glibc and
since I don't have multilib compiler, I can't compile it ... So I am in catch22
situation. It looks like you need multilib compiler to compile multilib
compiler.
Also, I have tried without --with-multilib-lists, without --enable-targets, it
was same. Just when I used --enable-targets=all, it failed saying that 64bit
mode is unimplemeted after stage1 xgcc has been built.
Also, I have tried with system gmp, mpfr and mpc libraries which are same
versions as ones that are in gcc source tree (source dirs renamed into mpfr,
gmp and mpc respectively).
This is configure output from stage1 libgcc when using --enable-targets=all
checking whether ln -s works... yes
checking for i686-pc-linux-gnu-gcc... /home/armin/src/build/./gcc/xgcc
-B/home/armin/src/build/./gcc/ -B/usr/gcc/i686-pc-linux-gnu/bin/
-B/usr/gcc/i686-pc-linux-gnu/lib/ -isystem /usr/gcc/i686-pc-linux-gnu/include
-isystem /usr/gcc/i686-pc-linux-gnu/sys-include -m64
checking for suffix of object files... configure: error: in
`/home/armin/src/build/i686-pc-linux-gnu/64/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.
and config.log says this:
Assembler messages:
Fatal error: no compiled in support for x86_64
configure:3058: $? = 1
So, is this really a problem in gcc bootstrap or my setup? And how else I am
able to build multilib compiler just from pure 32bit system? There must be a
way right?
