I understand my question is rather stupid, but what is the most 
preferable way to use ecc as a compiler to build itself? Even if I set 
cc and cxx variables in the root configure script, it still builds 
everything with gcc. Is setting CC and CXX environment variables sufficient?

Dmitry

19.10.2013 05:02, Richard Pennington ?????:
> The clang/LLVM based ELLCC project (http://ellcc.org), after having 
> reached a huge milestone (http://ellcc.org/blog/?p=231) has now 
> successfully compiled itself.
>
> The steps were:
> 1. Use gcc to build the compiler with Linux standard libraries.
> 2. Use ecc to build itself with libc++, libc++ABI, libunwind, musl, 
> and compiler-rt
> 3. Use the newly built compiler to build itself again.
>
> One interesting side note: The compiler was 12MB smaller after it 
> built itself.
>
> ct-fw-88 ellcc 622 % size */Release+Asserts/bin/ecc
>
> text    data     bss     dec     hex filename
>
> 52415858 2152024   84768 54652650        341eeea 
> llvm-build/Release+Asserts/bin/ecc
>
> 40222706 2117136  135416 42475258        2881efa 
> llvm-build-self/Release+Asserts/bin/ecc
>
> Even more interesting, it was compiled statically. No dynamic 
> libraries needed:
>
> ct-fw-88 ellcc 623 % ldd */Release+Asserts/bin/ecc
>
> llvm-build/Release+Asserts/bin/ecc:
>
> linux-vdso.so.1 =>  (0x00007fff2ffff000)
>
> libz.so.1 => /lib64/libz.so.1 (0x00007facd87e1000)
>
> libpthread.so.0 => /lib64/libpthread.so.0 (0x00007facd85c4000)
>
> libncurses.so.5 => /lib64/libncurses.so.5 (0x00007facd837c000)
>
> librt.so.1 => /lib64/librt.so.1 (0x00007facd8173000)
>
> libdl.so.2 => /lib64/libdl.so.2 (0x00007facd7f6f000)
>
> libstdc++.so.6 => /home/de023789/gnulocal/lib64/libstdc++.so.6 
> (0x00007facd7c6e000)
>
> libm.so.6 => /lib64/libm.so.6 (0x00007facd7a18000)
>
> libgcc_s.so.1 => /home/de023789/gnulocal/lib64/libgcc_s.so.1 
> (0x00007facd7803000)
>
> libc.so.6 => /lib64/libc.so.6 (0x00007facd74a5000)
>
> /lib64/ld-linux-x86-64.so.2 (0x00007facd89f7000)
>
> llvm-build-self/Release+Asserts/bin/ecc:
>
> not a dynamic executable
>
> ct-fw-88 ellcc 624 %
>
> That is very cool.
>
> -Rich
>