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* [Bug c/53662] New: Cannot build static gcc on i686 linux gnu with -m64 support.
@ 2012-06-13 20:56 krejzi at email dot com
  2012-06-13 21:13 ` [Bug c/53662] " redi at gcc dot gnu.org
                   ` (4 more replies)
  0 siblings, 5 replies; 6+ messages in thread
From: krejzi at email dot com @ 2012-06-13 20:56 UTC (permalink / raw)
  To: gcc-bugs

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: unassigned@gcc.gnu.org
        ReportedBy: krejzi@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?


^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2014-06-30 19:33 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-06-13 20:56 [Bug c/53662] New: Cannot build static gcc on i686 linux gnu with -m64 support krejzi at email dot com
2012-06-13 21:13 ` [Bug c/53662] " redi at gcc dot gnu.org
2012-06-13 21:17 ` krejzi at email dot com
2012-06-13 23:12 ` redi at gcc dot gnu.org
2012-11-26  4:01 ` bugfeed at online dot de
2014-06-30 19:33 ` mpolacek at gcc dot gnu.org

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