Compilng libgcc xgcc error

Question

I'm trying to install cross compiler, this tutorial, and when I want to make libgcc I just put make all-target-libgcc in my terminal. This make throws error

checking whether ln -s works... yes
checking for i586-elf-gcc...  /usr/src/build-gcc/./gcc/xgcc -B/usr/src/build-gcc/./gcc/         -B/usr/local/cross/i586-elf/bin/ -B/usr/local/cross/i586-elf/lib/ -isystem /usr/local/cross/i586-elf/include -isystem /usr/local/cross/i586-elf/sys-include   
checking for suffix of object files... configure: error: in `/usr/src/build-gcc/i586-elf/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.
make: *** [configure-target-libgcc] Error 1

In config.log I found

Target: i586-elf
Configured with: ../gcc-4.8.0/configure --target=i586-elf --prefix=/usr/local/cross --        disable-nls --enable-languages=c,c++ --without-headers : (reconfigured) ../gcc-4.8.0/configure --target=i586-elf --prefix=/usr/local/cross --disable-nls --enable-languages=c,c++ --without-headers : (reconfigured) ../gcc-4.8.0/configure --target=i586-elf --prefix=/usr/local/cross --disable-nls --enable-languages=c,c++ --without-headers
Thread model: single
gcc version 4.8.0 (GCC) 
configure:3358: $? = 0
configure:3347:  /usr/src/build-gcc/./gcc/xgcc -B/usr/src/build-gcc/./gcc/ -    B/usr/local/cross/i586-elf/bin/ -B/usr/local/cross/i586-elf/lib/ -isystem /usr/local/cross/i586-elf/include -isystem /usr/local/cross/i586-elf/sys-include    -V >&5
xgcc: error: unrecognized command line option '-V'
xgcc: fatal error: no input files

In fact xgcc don't have '-V' option. I'm searching the way how to compile libgcc.

Thanks in advance

Keble

Normally libgcc is part of the GCC compiler so should be built with GCC. You don't need special actions to get it built. – Submission

Same error here. gcc version 4.8.1 (GCC) – Bicker

Answer 1

Here's the problem: Before you attempted to build libgcc as you described, you built an extreme bare-bones cross compiler. Now, part of the standard tests that the configure script runs is to test the compiler to see if it will produce a working executable file under normal conditions. Your bare bones compiler can't. Fortunately, for libgcc, you don't need to produce an executable, just a static library libgcc.a . The problem is that the stupid GNU autoconf-generated script doesn't realize that.

I encountered this same problem and devised a very ugly workaround. You need to comment out a section of the libgcc/configure file in your gcc source directory. Here's the section I commented out for my version; do something similar to yours:

At line 3484:

{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_file" >&5
$as_echo "$ac_file" >&6; }
# BEGIN PHILLIP EDIT
# if test -z "$ac_file"; then :
  # $as_echo "$as_me: failed program was:" >&5
# sed 's/^/| /' conftest.$ac_ext >&5

# { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
# $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
# { as_fn_set_status 77
# as_fn_error "C compiler cannot create executables
# See \`config.log' for more details." "$LINENO" 5; }; }
# fi
ac_file='a.out'
# END PHILLIP EDIT
ac_exeext=$ac_cv_exeext

Hope this helps.

Senhorita

I tried several version of GCC, it's always the same. Your answer seems to be the only one that solves my problem. – X

Answer 2

I ran into a similar problem trying to build libstdc++ by itself. The configuration options --enable-offload-target=x86_64-pc-linux-gnu resolve the issue and --disable-bootstrap saved quite a bit of compile time. After adding the former flag, make all-target-libstdc++-v3 stopped complaining about xgcc and the compiler cannot create executables. No need for the above patch, hopefully this will help someone else.

Conspiracy

Answer 3

Commenting out the following section in the libgcc/configure file solved it for me. Look at https://mcmap.net/q/855985/-compilng-libgcc-xgcc-error for more context on the configure file.

# for ac_option in --version -v -V -qversion; do
#   { { ac_try="$ac_compiler $ac_option >&5"
# case "(($ac_try" in
#   *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
#   *) ac_try_echo=$ac_try;;
# esac
# eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
# $as_echo "$ac_try_echo"; } >&5
#   (eval "$ac_compiler $ac_option >&5") 2>conftest.err
#   ac_status=$?
#   if test -s conftest.err; then
#     sed '10a\
# ... rest of stderr output deleted ...
#          10q' conftest.err >conftest.er1
#     cat conftest.er1 >&5
#     rm -f conftest.er1 conftest.err
#   fi
#   $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
#   test $ac_status = 0; }
# done

Corkwood