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
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